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  • 2020-2023
  • 1970-1974  (499)
  • 1965-1969
  • 1920-1924
  • 1973  (499)
  • Analytical Chemistry and Spectroscopy  (485)
  • Insulin
  • Psychopharmacology
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  • 2020-2023
  • 1970-1974  (499)
  • 1965-1969
  • 1920-1924
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of insulin on bone resorption (1973)
    Springer
    Calcified tissue international 12 (1973), S. 8-15 
    Details
    ISSN: 1432-0827
    Keywords: Insulin ; Bone ; Calcium ; Resorption ; Orthophosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé L'administration d'insuline cristallisée à des rats thyroparathyroidectomisés provoque une augmentation de la calcémie et de la phosphorémie. Le calcium plasmatique s'élève de façon linéaire entre 31 et 250 m Unités d'insuline/100 g de poids corporel. La courbe obtenue n'est guère différente de celle obtenue par extrait parathyroidien. L'administration simultanée d'insuline et d'extrait parathyroidien à des rats thyro-parathyroidectomisés agit sur la calcémie et la phosphorémie par un effet additif. Lorsque des os frontaux d'embryons de poulet sont cultivésin vitro en présence d'insuline cristallisée, le taux de résorption augmente. L'insuline augmente le taux de consommation en glucose des explants et induit une accumulation de citrate dans le milieu de culture. L'insuline stimule donc la résorption osseuse.
    Abstract: Zusammenfassung Der Plasmagehalt an Calcium und Phosphor bei thyroparathyreoidektomierten Ratten wurde durch die Verabreichung von kristallinem Insulin erhöht. Das Plasmacalcium verhielt sich zwischen 31 und 250 m Einheiten Insulin pro 100 g Körpergewicht linear. Die Steigung der erhaltenen Kurve ist nicht signifikant verschieden von derjenigen, die nach Parathyreoidea-Extrakt erhalten wird. Die gleichzeitige Verabreichung von Insulin und Parathyreoidea-Extrakt von thyroparathyreoidektomierten Ratten hatte eine kumulative Wirkung auf den Gehalt von Calcium und Phosphor im Plasma. Wenn Stirnbeine von Kükenembryos mit kristallinem Insulinin vitro kultiviert wurden, erhöhte sich die Resorptionsrate. Das Insulin steigerte den Glucoseverbrauch der Explantate und verursachte eine Anreicherung von Citrat im Kulturmedium. Die Ergebnisse deuten auf eine Stimulation der Knochenresorption durch Insulin.
    Notes: Abstract the administration of crystalline insulin to thyroparathyroidectomized rats raised their calcium and phosphorus plasma levels. The plasma calcium gave a linear response between 31 and 250 mU of insulin/100 g body weight. The slope obtained is not significantly different from that obtained with parathyroid extract. The simultaneous administration of insulin and parathyroid extract to thyroparathyroidectomized rats affected the calcium and phosphorus plasma levels in an additive fashion. When chick embryo frontal bones were cultivatedin vitro with crystalline insulin the rate of resorption increased. Insulin increased the rate of glucose consumption by the explants and induced the accumulation of citrate in the culture medium. It is concluded that insulin stimulates bone resorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02013717
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  • 2
    Electronic Resource
    Electronic Resource
    Der Einfluß von Atropin auf die durch intestinale Hormone induzierte Insulinsekretion des Menschen (1973)
    Springer
    Research in experimental medicine 160 (1973), S. 234-247 
    Details
    ISSN: 1433-8580
    Keywords: Insulin ; Intestinal hormones ; Atropine ; Vagus ; Insulin ; Intestinale Hormone ; Atropin ; Vagus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung und Schluβfolgerung Bei 35 stoffwechselgesunden freiwilligen Probanden wurde vor sowie nach Atropingabe die Wirkung der intestinalen Hormone Sekretin und Cholecystokinin-Pankreozymin (CCK-PZ) auf die endokrine und exokrine Pankreasfunktion untersucht. Außerdem wurde die Wirkung von intravenös und oral bzw. intraduodenal verabreichter Glucose und Aminosäuren auf die Insulinsekretion, den Blutzucker und die freien Fettsäuren ebenfalls vor und nach Atropinmedikation geprüft. Intravenös verabreichtes Sekretin konnte weder in seiner exokrinen noch endokrinen Pankreasfunktion durch Atropin beeinflußt werden. Intravenös injiziertes CCK-PZ konnte mittels Atropin sowohl in seiner ekbolischen wie auch endokrinen Pankreasfunktion gehemmt werden. Die Wirkung von CCK-PZ ist somit an ein cholinerges System gebunden, so daß es erlaubt erscheint, bezüglich der Pankreozyminwirkung von einem synergistisch bzw. additiv wirksam werdenden „neurohormonalen“ Mechanismus zu sprechen. Die durch parenteral verabreichte Glucose oder Aminosäuren induzierte Insulinsekretion wurde durch Atropin nicht beeinflußt; hingegen hemmte Atropin dieβ-cytotrope Wirkung von oral bzw. intraduodenal verabreichter Glucose oder Aminosäuren. Dies läßt auf eine Abhängigkeit von einem cholinergen oder parasympathischen System in der Freisetzung dieser intestinalen Hormone schließen.
    Notes: Summary and Conclusions In 35 metabolically normal subjects the effect of i.v. secretin and cholecystokinin-pancreozymin (CCK/PZ) on the endocrine and exocrine pancreatic function was investigated, before and after atropine. In addition, the effect of oral, intravenous and intraduodenal administration of glucose and amino acids on blood sugar and free fatty acids before and after the injection of atropine was studied. The secretin stimulated endocrine and exocrine pancreas was not affected by atropine. However, atropine inhibited the ecbolic and endocrine pancreatic function after stimulation with CCK/PZ. Therefore, the effect of i.v. CCK/PZ seems to be mediated by the cholinergic system, or even a “neuro-hormonal” system which acts synergically or additively. No influence of atropine on the insulin secretion induced by i.v. glucose or amino acids was observed. On the other hand, atropine inhibited the beta-cytotropic effect of glucose and amino acids after oral or intraduodenal administration. These findings indicate that the release of these intestinal hormones is dependent on the cholinergic or parasympathetic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01856787
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Einfluß des Insulins auf die intestinale Resorption beim Menschen (1973)
    Springer
    Research in experimental medicine 161 (1973), S. 262-271 
    Details
    ISSN: 1433-8580
    Keywords: Small intestine ; Absorption ; Insulin ; Man ; Dünndarm ; Resorption ; Insulin ; Mensch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß von Insulin auf die Resorption von Glucose, Wasser, Natrium und Kalium wurde mittels der segmentalen Dünndarmperfusion mit einer dreilumigen Sonde untersucht. Nach Messung der Resorption über zwei 30 min-Perioden wurden den Probanden 1,0 g Tolbutamid (Rastinon®) bzw. 20 IE Insulin (Actrapid®) intravenös injiziert und danach die Resorption über vier 15 min-Perioden bestimmt. Ergebnisse 1. Stoffwechselgesunde zeigten sowohl nach Injektion von Tolbutamid und dadurch induzierter Erhöhung des Seruminsulinspiegels als auch nach Insulininjektion eine signifikante Minderung der Resorption. 2. Diese Resorptionsminderung war auch nachweisbar, wenn Glucose zur Verhinderung des Blutzuckerabfalls unmittelbar nach der Insulininjektion infundiert wurde. 3. Insulinbedürftige Diabetiker lassen nach der Injektion von Tolbutamid — offenbar infolge fehlender Insulinsekretion — keine Resorptionsänderungen erkennen, zeigen aber eine Transportminderung nach Insulininjektion. Diese Befunde belegen, daß die Glucose-, Wasser-, Natrium- und Kaliumresorption im menschlichen Dünndarm durch Insulin reduziert wird.
    Notes: Summary The influence of insulin on the intestinal absorption of glucose, water, sodium and potassium was investigated in man using a triple lumen tube technique. After an absorption period of 60 min 1 g of tolbutamide was injected in order to stimulate endogenous insulin secretion. Alternatively 20 units of regular insulin were applied intravenously. Thereafter absorption was studied over 4 periods of 15 min duration. Results: 1. In healthy subjects the absorption of glucose water, sodium and potassium was decreased after the injection of tolbutamide as well as after the injection of insulin. 2. The decrease in absorption was also demonstrable when the insulin induced reduction of blood sugar levels was abolished by intravenous glucose infusion. 3. In insulin dependent diabetics there was no decrease in absorption after injection of tolbutamide. This was due to the unability to secrete insulin. On the other hand a decrease in absorption occurred if insulin was applied in insulin dependent diabetics. These results demonstrate that the absorption of glucose, water, sodium and potassium from the human intestine is reduced by insulin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01851450
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  • 4
    Electronic Resource
    Electronic Resource
    In vitro studies on insulin secretion in the genetically obese mouse (1973)
    Springer
    Diabetologia 9 (1973), S. 447-452 
    Details
    ISSN: 1432-0428
    Keywords: Insulin ; obese mice ; pancreas ; glucose ; amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Pancreatic insulin content and insulin secretion, from the pancreas of obese mice fed ad lib (ob/ob), obese mice maintained on a restricted diet (ob/ob RD) and lean mice has been studied using incubated pieces of pancreas in vitro and in a perifusion system. The ob/ob mice pancreas contained approximately twice as much insulin as the lean mice pancreas, whereas the ob/ob RD mice had a normal insulin content. Increasing the glucose concentration had a marked and prolonged stimulating effect on insulin secretion in the pancreas of the ob/ob and ob/ob RD mouse, but not in the lean mouse. Leucine stimulated insulin secretion in all three groups of animals both in the absence and presence of glucose in a biphasic manner; in the presence of glucose the insulin secreted from the pancreas of the ob/ob and ob/ob RD mice was abnormally high. Arginine stimulated insulin secretion from the lean mouse pancreas in the absence of glucose, whereas in the obese mouse pancreas stimulation was observed only in the presence of glucose, and the effect increased with increasing glucose concentration. The large amounts of insulin which can be secreted by the pancreas of the ob/ob and ob/ob RD mice under stimulation suggest that an abnormal response of the pancreas to biological stimuli of insulin secretion could be a primary defect in these animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00461686
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  • 5
    Electronic Resource
    Electronic Resource
    Physiological factors influencing insulin clearance by the isolated perfused rat liver (1973)
    Springer
    Diabetologia 9 (1973), S. 174-177 
    Details
    ISSN: 1432-0428
    Keywords: Insulin ; clearance ; perfusion ; radioimmunoassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Hepatic insulin clearance was studied in normal male and female Wistar rats using the isolated liver perfusion technique and the dextran coated charcoal radioimmunoassay for insulin. The following results were obtained: — 1. In male rats there was a progressive increase in clearance with increasing body weight, liver weight and age. — 2. In adult female rats clearance was significantly greater than in comparable males, but no relationship between liver weight and clearance was observed. — 3. With each increase in insulin concentration there was an apparent decrease in clearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01219779
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  • 6
    Electronic Resource
    Electronic Resource
    Intragastric self-administration of medazepam in rats (1973)
    Springer
    Psychopharmacology 28 (1973), S. 87-94 
    Details
    ISSN: 1432-2072
    Keywords: Psychopharmacology ; Intragastric ; Self-Administration ; Benzodiazepines ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A technique for intragastric self-administration in rats is presented. Intravenous self-administration of morphine was compared with intragstric self-administration during 6 consecutive days. There was no difference between the two routes in the total rate of injections. Medazepam was given for intragastric self-administration at three different doses (2.5, 5.0 and 10.0 mg/kg/injection respectively) and compared with saline. There was an increased response rate at the dose 10 mg/kg/injection. Medazepam placebo solution (solvent alone) was also compared with medazepam 10 mg/kg/injection. Among the seven experimental rats, six responded higher on medazepam than on the solvent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413960
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  • 7
    Electronic Resource
    Electronic Resource
    Cannabiserlebnisse Wuppertaler Schüler (1973)
    Springer
    Psychopharmacology 33 (1973), S. 349-354 
    Details
    ISSN: 1432-2072
    Keywords: Cannabis Experience ; Drugs ; Psychopharmacology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 705 Wuppertal School children were requested to give information upon their drug experience by using a standardized questionnaire. 46 school children reported to have taken cannabis. The information given by these children upon their first cannabis experience, cannabis experience after repeated use, their behaviour after taking cannabis, changes in mood and personality due to cannabis use, and the effect of cannabis use on sexuality, showed extreme individual variations, e.g. extremely positive and negative experiences. The results show that individually extremely varying effects of cannabis can also be observed in such a small homogeneous group of subjects as Wuppertal school children. In general, the cannabis effects experienced by the Wuppertal school children were similar to those experienced by the young people in Berlin. However, some differences were observed: The “strong feeling of hunger” and “thirst” which were reported by the young people in Berlin as typical cannabis effects, were absent in the Wuppertal school children.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437512
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  • 8
    Electronic Resource
    Electronic Resource
    Plasma insulin and carbohydrate metabolism after sucrose ingestion during rest and prolonged aerobic exericise (1973)
    Springer
    Pflügers Archiv 342 (1973), S. 207-218 
    Details
    ISSN: 1432-2013
    Keywords: RQ ; Insulin ; Glucose ; Lactate ; Pyruvate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary RQ, plasma insulin, blood glucose, lactate and pyruvate were measured in six fit, normal subjects during a series of exercise and rest experiments with and without sucrose ingestion. Subjects exercised on a bicycle ergometer for 50 min of every hour for 6 h at about 47% of the group's average maximal aerobic capacity. In the resting experiments, the subjects sat for 6 h in an armchair. A solution containing 100 g of sucrose was ingested at the beginning of the fourth hour during the sucrose experiments. Ingestion of sucrose caused a significant increase in RQ, plasma insulin, blood glucose, lactate and pyruvate in both exercise and rest experiments. Insulin, lactate and pyruvate concentrations rose higher during rest after sucrose ingestion than during exercise. The time courses of the changes in RQ, insulin, glucose, lactate and pyruvate after sucrose ingestion, suggest that glucose entering the cell during rest is immediately oxidized, while during work there is some delay in the oxidation of glucose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591369
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  • 9
    Electronic Resource
    Electronic Resource
    Rapid effect of insulin on labelling of bis-phosphoenolpyruvate (1973)
    Springer
    Pflügers Archiv 345 (1973), S. 353-356 
    Details
    ISSN: 1432-2013
    Keywords: Insulin ; Muscle Metabolism ; Carbohydrate Metabolism ; “Bis-Phosphoenolpyruvate”
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The time course of the insulin effect on 1,2-bis-phosphoenolpyruvate (bis-PEP), a glucose metabolite, has been investigated. Within 30 sec insulin causes an increase of 60% in the amount of bis-PEP accumulated in incubation media of rat diaphragms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585854
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  • 10
    Electronic Resource
    Electronic Resource
    Biochemische und hämodynamische Effekte von Zink-Protamin-Glucagon am Menschen (1973)
    Springer
    Journal of molecular medicine 51 (1973), S. 951-956 
    Details
    ISSN: 1432-1440
    Keywords: long acting glucagon ; glucose ; free fatty acids ; insulin ; left ventricular contractility ; Depot-Glucagon ; Glucosestoffwechsel ; freie Fettsäuren ; Insulin ; linksventriculäre Kontraktilität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zink-Protamin-Glucagon zeigt bei s.c.-Injektion in einer Dosis von 5 mg einen deutlichen, aber protrahierten Anstieg des Blutzuckers um rund 40% innerhalb 1 Std und behält dieses erhöhte Niveau durch mehrere Stunden bei. Die Lipase-Aktivitätssteigerung nach Glucagon ist beim Menschen nur kurzfristig und unbedeutend [rund 7% ige Zunahme der freien Fettsäuren (FFS) 10 min p. inj.], sie wird von einem insulininduzierten Abfall der FFS um rund 50% im Laufe von 6 Std gefolgt. Die Zunahme der Insulinspiegel im Serum ist zwar statistisch signifikant, erreicht aber nicht das Ausmaß der von der intravenösen Verabreichung bekannten Veränderungen. Die hämodynamischen Effekte einer Einzeldosis von 5 mg Zink-Protamin-Glucagon sind nicht eindeutig und lassen lediglich eine nicht signifikante Zunahme von LVdp/dt max um 16,7% nach 15 min erkennen, während alle anderen Parameter im wesentlichen unverändert bleiben. Die mögliche klinische Bedeutung dieser Glucagoneffekte wird diskutiert.
    Notes: Summary The subcutaneous injection of 5 mg of zincprotamine-glucagon results in a 40% increase of blood glucose within 1 hour; this elevated level is maintained for several hours. The activation of lipase after the administration of glucagon in patients is insignificant and of short duration (only 7% rise of plasma FFA 10 minutes after injection) and is followed by an insulin-induced fall of plasma FFA by 50% within 6 hours. There is a concomitant, statistically significant rise in serum insulin. Haemodynamic measurements following a single dose of 5 mg of zinc-protamine-glucagon revealed only a statistically non significant 16.7% rise in LVdp/dt max, after 15 minutes, the other parameters remaining essentially unchanged. The possible elinical significance of these glucagon effects is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01468250
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  • 11
    Electronic Resource
    Electronic Resource
    Clinical use of radioimmunological plasma insulin assessment (1973)
    Springer
    Journal of molecular medicine 51 (1973), S. 63-67 
    Details
    ISSN: 1432-1440
    Keywords: Insulin ; glycaemia ; diabetes ; radioimmunoassay ; Insulin ; Glycaemia ; Diabetes ; Radioimmunoassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Bestimmung des immunoreaktiven Insulins im Plasma hat in der Diagnostik insulinsezernierender Tumoren allgemein Anwendung gefunden. Beim Diabetes mellitus ist diese Untersuchung von großer Bedeutung zur Unterscheidung der metabolischen und pankreatischen Faktoren dieser Krankheit. Sie erleichtert sowohl die Entscheidung in der Wahl der Therapie als auch die weitere Verlaufskontrolle.
    Notes: Summary The use of the measurement of plasma immunoreactive insulin levels is generally accepted for the diagnosis of insulin-secreting tumours. In diabetes, this determination is of major importance for the differentiation between the metabolic and pancreatic factors involved in the disease and it is helpful both for initiating therapy and following up cases over the years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01467757
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  • 12
    Electronic Resource
    Electronic Resource
    Glucose- und Insulinstoffwechsel bei Dialyse-Patienten (1973)
    Springer
    Journal of molecular medicine 51 (1973), S. 1010-1015 
    Details
    ISSN: 1432-1440
    Keywords: Hemodialysis ; glucose tolerance ; insulin ; Hämodialyse ; Glucosetoleranz ; Insulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 39 Dialysepatienten wurden i.v. Glucosetoleranzteste (i.v. GTT) durchgeführt und anhand des AssimilationskoeffizientenK beurteilt. Bei 25 Patienten wurde während des Testes das immunologisch meßbare Insulin (IMI) bestimmt. Bei 5 Patienten und 4 Kontrollpersonen wurden außerdem Insulintoleranzteste (i.v. ITT) durchgeführt. 56% der Patienten wiesen pathologischeK-Werte unter1,2 auf. Eine negative Korrelation zwischenK-Wert und Serumosmolarität konnte nachgewiesen werden. Bei allen Patienten waren die 5- und 10-min Blutzucker-(BZ-)Werte im i.v. GTT in Abhängigkeit des Hämatokrits vermindert. Ebenso waren die Insulinspiegel während des i.v. ITT bei den Patienten vermindert. Aufgrund dieser beiden Befunde ist ein Vergleich der Höhe der Insulinspiegel von Dialysepatienten und Stoffwechselgesunden nicht möglich. Allerdings konnte beobachtet werden, daß bei Patienten mitK〈1,2 die Insulinausschüttung verzögert erfolgte. Beim i.v. ITT fand sich ein verzögerter BZ-Abfall nach der Insulingabe, außerdem war die Halbwertszeit des i.v. applizierten Insulins verlängert. Demnach resultiert die Glucosestoffwechselstörung bei Dialysepatienten aus der Kombination von verlangsamter Insulinausschüttung aus dem Pankreas und verzögerter Insulinwirkung in der Peripherie.
    Notes: Summary In 39 patients undergoing regular hemodialysis treatment (RDT), intravenous glucose tolerance tests (IVGTT) were performed. They were evaluated on the basis of the assimilation coefficient (K-rate). During the tests, immunologically measurable insulin (IMI) was investigated in 25 cases. Intravenous insulin tolerance tests (IVITT) were performed in 5 patients and 4 controls. 56% of the patients showed abnormalK-values (K〈1.2). A negative correlation betweenK-rate and osmolarity could be demonstrated. Depending on the hematocrit, low blood glucose levels were found in all patients 5 and 10 minutes after beginning the IVGTT. Low insulin concentrations during IVITT were also observed. Because of these two findings, a comparison of insulin levels between dialysed patients and normal subjects is not possible. However, the release of insulin was delayed in patients withK-rates lower than 1.2. During IVITT patients on RDT showed a delayed decrease of blood glucose compared to controls, moreover, half-life of i.v. administered insulin was prolonged. It is concluded that the abnormal glucose metabolism in patients on RDT can result from a combination of delayed insulin secretion of the pancreas and delayed peripheral insulin activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01468293
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  • 13
    Electronic Resource
    Electronic Resource
    Flunitrazepam (Ro 5-4200) and sleep cycle in normal subjects (1973)
    Springer
    Psychopharmacology 32 (1973), S. 343-349 
    Details
    ISSN: 1432-2072
    Keywords: Psychopharmacology ; Sleep ; Flunitrazepam ; Benzodiazepines ; Insomnia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The action of flunitrazepam (Ro 5-4200) a benzodiazepine derivative was assessed on the sleep cycle of normal volunteers by means of all-night recordings. Baseline placebo nights were compared with the drug (2 mg p.o.) and with the placebo postdrug nights. Flunitrazepam induced a shift to faster frequencies of the EEG and increased non-rapid eye movement sleep. REM sleep was decreased at the expense of a smaller number of REM periods and shifted to the last two thirds of the night. During drug administration an adaptation was seen to the depressive action on REM sleep. Following withdrawal, an REM rebound was observed only during the first thirds of the night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429470
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  • 14
    Electronic Resource
    Electronic Resource
    Glycogen content and glucose uptake in stimulated frog sartorius muscle: Effects of prolonged incubation, insulin, and testosterone (1973)
    Springer
    European journal of applied physiology 31 (1973), S. 163-172 
    Details
    ISSN: 1439-6327
    Keywords: Muscle Glycogen ; Exercise ; Insulin ; Testosterone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Anin vitro preparation of electrically stimulated sartorius muscle of the frog was used as a model to investigate the effects of insulin and testosterone on the increased glycogen content of frog skeletal muscle that was observedin vivo 48 h after an exhaustive bout of treadmill exercise. Thein vitro preparation could effectively extract glucose from the bathing medium and continue glycogen synthesis for incubation periods up to 60 h, and the electrical stimulation depleted glycogen by 68%. Electrical stimulation enhanced rates of glucose uptake and glycogen synthesis when these variables were measured after prolonged periods of poststimulation incubation but did not cause an overshoot of glycogen storage similar to that observedin vivo. Stimulation did not produce increments in glycogen synthesis that were additive to those of insulin or testosterone. The absence of glycogen overshoot in thein vitro system may have resulted from the absence of neural factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697596
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  • 15
    Electronic Resource
    Electronic Resource
    Moseley and the numbering of the elements. B. Jaffe. Science Study Series, Doubleday: New York. $1.95 (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 2 (1973), S. A21 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300020412
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  • 16
    Electronic Resource
    Electronic Resource
    News and events (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 2 (1973), S. A22 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300020414
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  • 17
    Electronic Resource
    Electronic Resource
    NMR stereotopic induced shifts in epimeric mixturesContribution No. 377 from the Instituto de Química, UNAM. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 291-293 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton NMR spectra of epimeric mixtures of menthone (1), carvomenthone (2), carquejone (3), 2,5-dimethyl-1,4-cyclohexanedione (4) and piqueridione (5) were studied using the chemical shift reagent Eu(DPM)3. The results allow quantifications of the epimers and some conformational assignments to be made.
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    The effect of solute concentration on the chemical shift of aromatic compounds. Some studies using 1-iodonaphthalene as a model compound (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 321-325 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The change in chemical shift with solute concentration (dilution effect) has been determined for a model compound - 1-iodonaphthalene - in cyclohexane and carbon tetrachloride. The data and assignments for this compound differ from those of previous work. A simple model is proposed to account for dilution shifts in aromatic solutes and their sensitivity to proton position. Solvent shifts are also discussed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050704
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  • 19
    Electronic Resource
    Electronic Resource
    Der Einfluss des anomer verknüpften Adeninrestes auf die 13C-chemischen Verschiebungen von Pyranosen (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 311-319 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The influence of the anomeric attached adenine residue on the 13C chemical shifts of aldopyranose carbons is discussed for a series of pyranosyl adenines. The anomeric carbons with an axially oriented heterocycle always resonate at higher field than the corresponding ones with an equatorial orientation. This rule can be used for the determination of the pyranose conformation. Substituting the anomeric hydroxyl group by an adenyl residue causes deshielding on C-5 of the pyranose residue.
    Notes: Der Einfluß des anomer verknüpften Adeninrestes auf die 13C-chemischen Verschiebungen von Aldopyranosen wird für eine Reihe von Pyranosyladeninen diskutiert. Anomere Kohlenstoffatome mit axial verknüpftem Heterocyclus absorbieren stets bei höherem Feld als entsprechende mit äquatorial orientiertem Adenin. Diese Regel kann zur Bestimmung der Pyranosekonformation verwendet werden. Wird die anomere Hydroxylgruppe durch einen Adeninrest ersetzt, dann verschiebt sich die Resonanz von C-5 des Pyranoserestes nach tieferem Feld.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050703
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  • 20
    Electronic Resource
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    Studies in nuclear magnetic resonance - XII: Complete analysis of the proton spectra of tert-butylcyohexane-3,3,4,4,5,5-d6 and -3,3,5,5-d4 (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 333-338 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Accurate parameters for the two title compounds have been obtained by the aid of a spectral subtraction technique in conjunction with analysis by LAOCN3. It is observed that J1eq, 6eq and J1ax, 2ax are abnormally large and small, respectively, and the significance of these and other coupling constants are discussed in terms of the probable geometry of tert-butylcyclohexane. The tert-butyl group affects the chemical shifts of the 4-protons, indicating that tert-butylcyclohexyl derivatives are poor models for fixed conformers of monosubstituted cyclohexanes. The deuterium isotope effects on proton chemical shifts appear to be influenced by the same factors as proton-proton coupling constants.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050706
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  • 21
    Electronic Resource
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    CIDNP of 13C and 1H nuclei in the reactions of cyclohexadienone carbenesPaper presented at the International Symposium on Chemically Induced Dynamic Polarisation of Nuclei and Electrons, Tallinn, Estonian SSR, 13th to 16th August 1972. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 339-342 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal decomposition of 4-diazo-2,6-di-tert-butyl-2, 5-cyclohexadien-1-one in perhalogenated solvents has been investigated. The decomposition reaction proceeds via a carbene intermediate first to a singlet and then to an effectively triplet free encounter radical pair formed in a halogen abstraction reaction. The polarisation of the stable reaction product is determined by competing processes in the primary cage, intersystem crossing and escape from the cage.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050707
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  • 22
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    Relation between the carbon chemical shifts and the J(CH) spin-spin coupling constants (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 351-352 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050710
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  • 23
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    NMR and chemistry, by J. W. Akitt, Chapman and Hall, London, 1973. pp. ix + 182. £1.90 (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. A6 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050712
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  • 24
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    Sur les complexes formés par le trifluorure de bore avec les sulfoxydes, aminoxydes, phosphinoxydes et arsinoxyde: Aspects généraux des spectres de RMN (1H, 11B, 19F et 31P) (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 357-360 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Various complexes (RnMO·BF3) of boron trifluoride with sulphoxides, aminoxides, phosphinoxides and arsinoxides have been prepared and investigated using proton, fluorine (at variable temperature) boron and phosphorus resonance. A comparison with similar adducts containing a co-ordinative O—B bond is presented.
    Notes: Les spectres de résonance magnétique nucléaire (1H, 11B, 19F et 31P) des complexes RnMO·BF3 formés par le trifluorure de bore et des sulfoxydes, aminoxydes, phosphinoxydes et arsinoxydes ont été obtenus. Les paramètres (déplacements et couplages) caractérisant ces spectres sont comparés à ceux de composés similaires renfermant également une liaison de coordination O·B.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050803
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  • 25
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973) 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050101
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  • 26
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    Two-frequency spin echo in molecular crystals (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 1-3 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The two-frequency pulse response of a multilevel system in NQR is investigated. Additional spin echo signals are shown to appear. The application of the two-frequency spin echo method to some of the crystals is demonstrated. The method is of great value for the investigation of local fields in crystals.
    Additional Material: 6 Ill.
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  • 27
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    Hammett correlation and chemical shift parameters of the methine proton in some 9-phenyl octahydroxanthenesContribution No. 349 from the Instituto de Química, UNAM. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 5-6 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Hammett σ values for para E (-) Substituents in 9-Phenyl octahydroxanthene outweigh the inductive and resonance effects acting on the methine proton.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050103
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  • 28
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    The proton magnetic resonance spectrum of 4-t-butyl-5, 6-dihydro-4H-pyran (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 7-8 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton magnetic resonance spectrum of 4-t-butyl-5,6-dihydro-4H-pyran has been analyzed with the aid of the paramagnetic shift reagent Eu(fod)3. All hydrogen-hydrogen spin-spin coupling constants are reported and a conformation is suggested which is consistent with these data.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050104
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  • 29
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    The NMR spectra and conformations of cyclic compounds-VIIIFor Part VII, see Ref. 1.. Car-3-ene (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 515-516 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 220 MHz PMR spectrum of car-3-ene (3,7,7-trimethylbicyclo[4,1,0]hept-3-ene) is interpreted and a conformation deduced. In contrast to previous work, which has discussed a highly buckled structure for the 6 membered ring, the present work finds this ring to be essentially planar.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270051104
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  • 30
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    Stéréochimie de β-diols et de leurs dérivés cycliques-VIPartil V: voir Réf. 46. Calcul empirique des déplacements chimiques en série dioxannique. Détermination et discussion des incréments de calcul (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 517-522 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In order to calculate empirically proton chemical shifts in methyl 1,3-dioxans, the basic values for each proton of 1,3-dioxan itself are estimated. Then, using methyl derivatives in the chair conformation, the Δδ primary effects of methyl groups in any position are given. Modifications take place in molecules with butane gauche interactions and these secondary effects are evaluated. Analogous Δδ in both the cyclohexane and dioxane series are related to similar cyclic geometry. The presence of oxygen atoms however, introduces important discrepancies.
    Notes: Afin de calculer empiriquement les déplacements chimiques des protons de dioxannes-1,3 méthylés, nous avons tout d'abord dégagé les valeurs de base du déplacement chimique de chaque proton du dioxanne-1,3. ensuite, en utilisant des dérivés méthylés en conformation chaise, nous avons établi une systématique effets Δδ des groupes méthyles en position quelconque.Pour certaines molécules, présentant notamment des interaction gauches, ces divers effts peuvent être modifiés, et nous avons é ces perturbations. L'analogie de Δδ entre les deux séries dioxannique et cyclohexanique a été rapprochée d'une similitude de gémétrie des cycles. Cependant la présence des atomes d'oxygène introduit des différnces parfois importantes.
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    URL: http://dx.doi.org/10.1002/mrc.1270051105
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  • 31
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    Solvent effects on the proton magnetic resonance spectra of p-substituted phenyltin chlorides (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 529-532 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A PMR study of solvent effects on some p-substituted phenyltin chlorides (substituents = CH3, (CH3)3C, CH3O) is reported. Co-ordination of solvent molecules to the tin atom leads to an unusual low field shift of the o-ring protons. The results for p-tolytin trichloride have been compared with those for p-tolylsilyl trichloride and discussed. In o-, m- and p-tolyltin trichlorides long range spin-spin couplings between the ring methyl protons and the tin atom have been observed. The order of magnitude is o- 〉 p- 〉 m-methyl protons.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270051107
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  • 32
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    Chemical shifts of aromatic protons in di-n-alkyl ortho-phthalates: Effect of dipolar interactions in a binary system, ester - carbon tetrachloride (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 549-549 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270051111
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  • 33
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973) 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270051201
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  • 34
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    13C and 1H NMR spectroscopic studies on the structure of N-methyl-3-pyridone and 3-hydroxypyridine13C NMR Spectroscopy, Part IV. For Part III, see Ref. 43. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 551-559 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbon and proton NMR spectra of 3-hydroxypyridine and its O-methyl and N-methyl derivatives have been analysed, and are compared with the spectra of the corresponding 2- and 4-substituted pyridines. It is shown, that contrary to quantum chemical predictions and in agreement with chemical experience, 3-hydroxy-pyridine has a phenolic structure in solution. For the N-methyl derivative, however, carbon and proton NMR data clearly demonstrate that this compound should be formulated as N-methyl-3-pyridone. The general problem of the 3-pyridones is discussed on the basis of calculated π-electron densities, IR and NMR data.
    Additional Material: 2 Ill.
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    New products (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. A13 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050114
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    Dioxidobutane: A comparison between high field and Eu-shifted PMR spectra (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 53-56 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complete analysis of the high field spectrum of the title compound gives well determined parameters in all cases; the value of the CH—CH coupling is in agreement with free rotation around this bond. In contrast, the Eu-shifted spectrum does not allow such a complete analysis because of lack of resolution. Shift dependence on concentration and temperature is reported and discussed.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050112
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  • 37
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    Détermination des Axes Propres et des Valeurs Principales du Tenseur ḡ dans deux Radicaux Libres Nitroxydes par Étude de Monocristaux (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 47-52 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The low temperature phase structure of the nitroxide radical 2,2,6,6-tetramethyl piperidin-1-oxyl (Tanane) is isomorphic of 2,2,6,6-tetramethyl-4-piperidinol-1-oxyl (Tanol). An ESR study of single crystals yielded the principal values and position of principal axes of the ḡ tensor in these two radicals. The major significant differences observed in Tanol are a moderate decrease in the gxx, gyy and gzz values, and a deviation of the principal axes situated in the molecular mirror plane from the N—O bond and π-orbital, respectively (8° ± 2°). The intermolecular hydrogen bond is probably responsible for this fact.
    Notes: La structure de la phase basse température du radical nitroxyde tétraméthyl-2,2,6,6 pipéridine oxyle-1 (Tanane) a été déterminée. Ce radical libre est isomorphe du tétraméthyl-2,2,6,6 pipéridinol-4 oxyle-1 (Tanol). Une étude en résonance paramagnétique électronique de monocristaux a permis de déterminer les valeurs principales et l'orientation des axes propres du tenseur ḡ pour ces deux radicaux. Pour le Tanane, la liaison N—O est une direction propre du tenseur ḡ. Pour le Tanol, il existe un angle de 8° ± 2° entre cette direction propre et la liaison N—O. Il est vraisemblable que, dans le cas du Tanol, la liaison hydrogène intermoléculaire est responsable de la déviation observée pour les axes propres situés dans le plan miroir , ainsi que des plus faibles valeurs mesurées pour gxx, gyy et gzz.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050111
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  • 38
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973) 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050201
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  • 39
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    Proton and boron-11 magnetic resonance studies of some potassium tetraarylborates (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 57-59 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton and boron-11 magnetic resonance spectra for several potassium para-substituted tetraarylborate compounds [KB(C6H4-pX)4, where X is H, OCH3, CH3, Br, Cl, F, CF3] have been obtained. The chemical shift between the centers of the AA′ and XX′ multiplets for the ring proton multiplets, relative to a reference chemical shift of 0·39 ppm for potassium tetraphenylborate, correlated with the corresponding Hammett σ values for the para-substituent. Additionally, the boron-11 chemical shifts gave a good correlation with corresponding σ values for the substituents. Electronegativities of para-substituted phenyl rings were calculated and found to be approximately 2·70 for all compounds studied. It was shown that electronic substituent effects do not greatly influence the electron density surrounding the central boron atom in the tetraarylborate ions.
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    URL: http://dx.doi.org/10.1002/mrc.1270050202
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  • 40
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    Etude comparative des méthyl-borazines par RMN (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 585-588 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A comparative study of borazine (0) and six methyl borazines (1 to 6) has been conducted by NMR. It becomes evident that the chemical shift of N—CH3 protons hardly varies between mono-, di- and tri-N-methyl borazines, whereas this parameter undergoes a strong change (in all 0·21 ppm, to high field) when one passes from N-trimethyl borazine (HB—NCH3)3 to hexamethyl borazine (CH3B—NCH3)3 through a gradual substitution on the three boron atoms (3, 4, 5 and 6). Moreover, a systematic variation of the parameter δ has been found between compounds 3, 4 and 5 for the protons which keep precisely the same immediate environment. A qualitative interpretation of this experimental result is proposed in terms of electronic effects general to the hexagonal planar boron/nitrogen ring which characterises these molecules.
    Notes: Une étude comparée du borazine (0) et de six méthyl-borazines (1 à 6) a été effectuée par RMN. Il apparaǐt nettement que le déplacement chimique des protons N—CH3 varie peu entre les mono-, di- et triméthyl-N borazines alors que ce měme paramètre subit une modification importante (au total 0,21 ppm vers les champs forts) quand on passe du triméthyl-N borazine (HB—NCH3)3 à l'hexaméthylborazine (CH3B—NCH3)3 par substitution progressive sur les trois atomes de bore (cycles 3,4, 5 et 6). En outre, une variation systématique du paramètre δ a pu ětre décelée entre les composés 3, 4 et 5 pour les protons qui conservent strictement le měme environnement immédiat. Une interprétation qualitative de ce résultat expérimental est proposée en termes d'effets électroniques généralisés au cycle hexagonal plan bore-azote qui caractérise ces molécules.
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    URL: http://dx.doi.org/10.1002/mrc.1270051207
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    Configurations and conformations in acyclic, unsaturated hydrocarbons. A 13C NMR study (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 147-153 
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    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR (CMR) spectra of a number of di- and trisubstituted ethylenes have been measured. Very consistent values are found for the differential shieldings of allylic carbons in a number of linear, (Z)- and (E)-disubstituted ethylenes. The discrepancies between the several structural elements are explained tentatively by assuming different rotational preferences in the (Z)-isomers, the (E)-isomers, or both. The results obtained for some branched olefins are qualitatively in agreement with conclusions reached in previous 1H NMR (PMR) investigations, with the possible exception of 2,5-diMe-3-hexene.Differential shieldings in trisubstituted ethylenes are larger than in disubstituted ethylenes, probably as a consequence of steric interaction between geminal substituents.It is confirmed, that API's recent relabelling of the isomers of 3-Me-2-hexene was justified. Furthermore, the (E)-configuration is assigned to the high-boiling isomer of 3,4,4-triMe-2-pentene. On the other hand, the high-boiling isomer of 3-Et-4-Me-2-pentene is shown to be the (Z)-isomer. For the isomeric pair of geraniol and nerol, the (E)-configuration is assigned to the former and the (Z)-configuration to the latter, in agreement with our recent PMR investigations.
    Additional Material: 6 Tab.
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    An abnormal spin-spin coupling of vinylic-allylic protons generated by a constraint of configuration (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 155-157 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a system where a rigid or frozen conformation constrains an allylic proton to orient nearly perpendicular to the plane of the olefinic bond, the allylic spin coupling may become comparable to, or greater than, the vicinal spin coupling. This anomalous situation is demonstrated in three series of compounds: the adducts of diazoalkanes to 1,2-diazepines, 4-piperidinocycloalk-2-en-1-one oximes and heterobicyclo[3,2,0]hept-3,6-dienes, where the NMR spectra have been well established by decoupling experiments.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270050310
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    Position specificity of 13C—31P coupling constants for methyl substituents in phospholes and 2 - PhospholenesPresented at the 164th National Meeting of the American Chemical Society, New York, 30th August 1972, No. ORGN-109. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 161-162 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C - 31P coupling constant is much larger for a 2-methyl substituent (about 20 Hz) than for a 3-methyl substituent (about 5 Hz) in phospholes and 2-phospholenes, and appears useful for assigning structures in these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050312
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    Déplacements Chimiques Induits par Complexation à l'Europium en Série Δ1-Pyrazoline (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 217-218 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The complex Eu (FOD)3 is shown to be a convenient shift reagent for Δ1-pyrazolines. The five examples described here were chosen to illustrate the usefulness of this method in the attribution of the stereochemistry of polycyclic Δ1-pyrazolines.
    Notes: Le complexe Eu (FOD)3 constitue un bon réactif de déplacement en spectroscopie de RMN de Δ1-pyrazolines. Les 5 exemples décrits ici ont été choisis en série polycyclique pour mettre en évidence l'utilité de cette technique en vue de l'attribution des stéréochimies.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270050504
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    Spectra 0656-0670 (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 1-16 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270051802
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  • 46
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    Specific rearrangements of 2,4-dimethyl-1-pentene upon electron-impact (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 17-21 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mass spectrometric investigation at 70 eV and at low voltage of specifically deuterated and undeuterated 2,4-dimethyl-1-pentene is reported, in order to illustrate the specificity of the degradation reactions occurring under electron-impact. A mechanism for the skeletal rearrangement of the molecular ion prior to fragmentation is proposed.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070104
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    The electron-impact induced fragmentation of substituted 4-styrylquinolinesReported in part at the 3rd Yugoslavian Conference on Pure and Applied Chemistry, Ljubljana, 12th to 17th June 1972. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1-10 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation of 4-styrylquinoline (I), 4-(p-nitrostyryl)-quinoline (II), 4-(p-chlorostyryl)-quinoline (III), 4-(p-hydroxystyryl)-quinoline (IV), 4-(p-methoxystyryl)-quinoline (V), 4-(p-dimethylaminostyryl)-quinoline (VI) and 4-(p-cyanostyryl)-quinoline (VII) under electron-impact in the mass spectrometer is reported. The role and the influence of substituents on the fragmentation scheme is discussed. The loss of the substituents from the molecular ion is correlated with LCAOMO quantities.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070102
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    Elektronenstossinduzierte Fragmentierung von Acetylenverbindungen - V:IV. Mitteil: H. Schwarz und F. Bohlmann, Org. Mass Spectrom.7, 23 (1973). Vergleich der Isomeren Naphthyl- und Phenyl-Pentinen-Alkohole (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 29-35 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The differences found in the fragmentation pattern of the isomeric naphthyl- and phenyl-pentynen-alcohols have been elucidated by the investigation of 2H- and 13C-labelled derivatives. As shown by high resolution mass spectrometry, in the case of the acetylenic compound, the ion [C9H7]⊕ is formed mainly by ketene elimination from the [M - 1]+-ion and from the naphthalenes by elimination of acetylene from the benztropylium-ion. The proposed mechanism of CO- and CHO-elimination given for benzylalcohol cannot be transferred to the compounds investigated.
    Notes: Die Unterschiede im Fragmentierungsschema der isomeren Naphthyl- und Phenylpentinen-aklohole sind durch Untersuchung der 2H- und 13C-markierten Derivate nachgewiesen worden. Wie durch hochauflösende Massenspektrometrie gezeigt werden kann, wird im Falle der Acetylenverbindung IOn [C9H7]⊕ hauptsächlich durch Keten-eliminierung aus dem [M - 1]+-Ion und bei den Naphthalinen durch Abspaltung von Acetylen aus dem Benztropylium-Ion gebidet. Der vorgeschlagene Mechanismus der CO- und CHO-Abspaltung füBenzylalkohol kann nicht auf die untersuchten Verbindungen übertragen werden.
    Additional Material: 6 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070106
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    Spectrometrie de Masse de Produits Naturels Aromatiques Polychlores (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 119-121 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass spectra of three natural aromatic compounds are reported: 1,4-dimethoxy-2,3,5,6-tetrachlorobenzene (I), 4-methoxy-2,3,5,6-tetrachlorophenol (II) and 1,4-dimethoxy-2-nitro-3,5,6-trichlorobenzene (III). Main fragmentations are explained according to the formation of a quinoid structure (a), which leads under electron-impact to the formation of a chlorocyclopropenone ion (c). Secondary routes giving [CxCl]+ ions are also proposed. Emphasis is given to the variations introduced into the fragmentation by the presence of a nitro group.
    Notes: On discute les spectres de masse de trois produits naturels aromatiques: le diméthoxy-1,4 tétrachloro-2,3,5,6 benzén (I), le méthoxy-4 tétrachloro-2,3,5,6 phénol (II) et le diméthoxy-1,4 nitro-2 trichloro-3,5,6 benzéne (III). Les principlaes fragmentations sont expliqués en fonction de la formation de la structure quinoide (a), qui conduit sous l'impact électronique à la formation de l'ion chlorocyclopropénone (c). On propose également des voies secondaires conduisant à la formation d'ions [Cx]+. On relevé les variations introduites dans la fragmentation par la présence du groupement nitro.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070118
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    Mass spectrometry of the trimethylsilyl derivatives of some cardiac aglycones and monoglycosides (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 141-153 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of the trimethylsilyl (TMS) ethers of digitoxigenin, digoxigenin, digitoxigenin monodigitoxoside, digoxigenin monodigitoxoside and peruvoside were obtained. Ions appearing at m/e 170 and m/e 183 are proposed to be indicative of the enol TMS ether moiety as confirmed by appropriate shifts in the mass spectrum of digitoxigenin derivatized with perdeuterotrimethylsilylating reagent. The TMS ether derivatives of the monoglycosides produced abundant molecular ions and the base peaks in the spectra represent fragments of the sugar portion of the molecule.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070204
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    Kinetic energy release in ionic fragmentations: Use as an ion structure probe (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 185-192 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetic energy released in unimolecular reactions, as measured from the width of the corresponding metastable peak, shows only a small dependence on such parameters as source temperature, ion-source residence time and ion acceleration voltage. Similarly, fragmenting ions generated from different members of an homologous series of molecular ions have been found to release the same kinetic energy and hence do not exhibit a degrees-of-freedom effect analogous to that for metastable abundances. In general, molecular ions formed by electron-impact have been found to release slightly less kinetic energy on fragmentation than the corresponding ions formed via a fragmentation sequence. These observations suggest that kinetic energy release is a useful method of structural characterization of metastable ions; while increase in the average internal energies of the ions sample lead to larger energy releases, this effect is usually small. The use of a very narrow energy resolving (β) slit and a procedure in which the metastable peak width is extrapolated to zero slit width has been found to improve the accuracy of measurement of the kinetic energy release, particularly when the metastable and main beam peak widths are of comparable magnitude.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210070208
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    Heterocyclic studies - XXIX:For Part XXXVIII, see Ref. 1. Mass spectra of some 1,2-dihydro-5-trifluoromethyl-pyrimido(5,4-E)AS-triazines (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 225-231 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of five 7-substituted-1,2-dihydro-5-trifluoromethylpyrimido(5,4-e)as-triazine derivatives are recorded. Fragmentation pathways, elucidation of which was assisted by deuterium labelling and accurate mass measurements, are compared with those of corresponding heteroaromatic compounds. Loss of HF initiated the major breakdown pathways, unless a large 7-substituent was present, which then fragmented preferentially.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070212
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    Elektronenstossinduzierte Fragmentierung von Acetylenverbindungen - VI:V. Mitteilung: H. Schwarz und F. Bohlmann, Org. Mass Spectrom. 7, 29 (1973). Struktur und Bildungsenthalpie der Ionen [C11H9]+ und [C9H7]+ (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 395-399 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The appearance potentials for [C11H9]+ from 1, e.g. 2-(chloromethyl)-naphthaline and 1-chloro-phenyl-(5)-penten-(2)-yne-(4), and for [C9H7]+ from indene, phenyl-propyne and phenyl-(5) penten-(2)-yne-(4)-ol-(1), have been correlated with thermochemical data to obtain the enthalpy of formation of the fragment-ions. A comparison between these enthalpies of formation and the values of enthalpy of hypothetical model structures shows that the [C11H9]+ ion is probably best represented as a benztropylium-ion and the [C9H7]+ ion as an ethynyl-tropylium-ion or as a phenylcyclopropenyl-cation. Open chain structures can be eliminated in all cases investigated.
    Notes: Die Erscheinungspotentiale für [C11H9]+ aus 1-bzw, 2-(Chlormethyl)-Naphthalin und 1-Chlor-phenyl-(5)-penten-(2)-in-(4) und für [C9H7]+ aus Inden, Phenylpropin und Phenyl-(5)-penten-(2)-in-(4)ol-(1) werden mit thermochemischen Daten korreliert, um die Bildungsenthalpien der genannten Fragment-Ionen zu erhalten. Ein Vergleich dieser Bildungsenthalpien mit den Enthapiewerten hypothetischer Modellstrukturen ergibt, dass das IOn [C11H9]+ wahrscheinlich am besten als Benztropylium-Ion und das Ion [C11H9]+ enweder als ein Äthinyl-Tropylium-Ion oder als ein Phenylcyclopropenyl-Kation wiedergegeben wird. Offenkettige Strukturen Können in allen untersuchten Fällen ausgeeschlossen werden.
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    The effect of 2,3-substituents upon the mass spectrometric fragmentation of quinoxalines (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 449-457 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric fragmentation of quinoxalines substituted with alkyl and aryl groups in the C-2 and C-3 positions and with groups containing heteroatoms have been studied. Fragmentation mechanisms for the compounds under investigation are proposed and discussed.
    Additional Material: 8 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070409
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    Massenspektrometrische Fragmentierungen β-Substituierter Adamantanone und Adamantandione (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 485-495 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: High resolution mass measurements and defocused metastable ion detection have been employed in an investigation of the electron-impact-induced fragmentation of a series of β-substituted adamantanones and adamantanediones. Whereas the isomeric bromo-, iodo- and thiocyanato-adamantanones give almost identical spectra, the fragmentation of the fluoro and chloro derivatives is dependent on whether the substituents are ‘axial’ or ‘equatorial’. Hydroxy- and acetoxy-adaman-tanones exhibit rather complex mass spectra. Adamantanediones, substituted in the β-position by various COR- and NR1R2-groups, exhibit characteristic ion peaks which are formed by McLafferty rearrangement and α-cleavage with subsequent elimination of carbon monoxide and allylic bond fission. The mass spectral behaviour of the isomeric hydroxy-carbomethoxy-adamantanones and dihydroxy-adamantanes is determined by the orientation of the functional groups.
    Notes: Durch hoch-und niederauflösende Massenspektrometrie und durch Bestimmung emtastabiler Ionen mittels Defokussierung wurde die elektronenstoß-induzierte Fragmentierung einer Reihe β-substituierter Adamantanone und Adamantandione untersucht. Während die isomeren Brom-, Jod- und Thiocyanato-adamantanone fast identische Spektren liefern, ist das Fragmentierungsverhalten der Fluor- und Chlor-Verbindungen davon abhängig, ob die Substituenten in Bezug auf den die Carbonyl-Gruppe enthaltenden Ring axial oder äquatorial angeordnet sind. Hydroxyund Acetoxy-adamantanone liefern ziemlich komplexe Massenspektren. Adamantandione, die in β-Stellung durch verschiedene COR-bzw. NR1R2-Gruppen substituiert sind, geben charakteristischen Peaks von Ionen, die durch McLafferty-Umlagerung bzw. α-Spaltung und anschließende Eliminierung von Kohlenmonoxid und Allyl-Spaltung gebildet werden Das Fragmentierungsverhalten der isomeren Hydroxycarbomethoxy-adamantanone und Dihydroxy-carbomethoxyadamantane wird durch die Orientierung der funktionellen Gruppen bestimmt.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070413
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    Zum Mechanismus massenspektrometrischer Fragmentierungsreaktionen - IXFür VIII. Mitteilung, siehe Lit.1.Sterische Effekte in den Massenspekten der Stereoisomeren von Decalin-2,3-diolen, Decalin-2,4-Diolen und Ihen Dimethyläthern (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 573-587 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectra of all stereoisomers of decalin-2,3-diol, the corresponding dimethyl ethers and of some deuterated derivatives are discussed. The mass spectra of isomeric decalin-2,3-diols differ only slightly in ion intensities. The mass spectra of the stereoisomeric 2,3-dimethoxy-decalins are nearly identical within the series of transand cisderivatives. A mass spectrometric identification of the stereoisomers of these compounds is therefore diffucult. Stereoselective eliminations from the molecular ion are not observed.The mass spectra -of stereoisomeric decalin-1,4-diols show characteristic differences in the intensities of the[M — H2O]+·-ions, which can be related to the geometry of the molecules in a similiar mode as was the case with cyclohexane-1,4-diols, The sterechemical control of the elimination of H2O from the molecular ions has been confirmed by deuterium labelling.The mass spectra of stereoismeric 1,4-dimethoxy-decalins also differ characteristically in the intensities of the [M — CH3OH]+· ions. Furthermore peak due to the [M — CH2O]+· ions are only observed in the mass spectra of those stereoisomers, which have at least one conformation with a short distance between the two methoxy. The stereospecifity of the CH3OH- and CH2O-eliminationjs has also been determined by deuterium labelling.
    Notes: Die Massenspektren aller Stereoisomeren des Decalin-2,3-diols und des Decalin-1,4-diols sowie ihrer Dimethyläther und einiger spezifisch deuterierter Dervae dieser Verbindungen werden diskutiert. Bei den Decallin-2,3 diolen weden nur geringe quantitative Unterschiede in den Ionenintensitätten gefunden. Die Massenspektren der stereoisomeren 2,3-Dimethoxy-decaline sind innerhalb der cis- und trans-Reihe nahezu glech, so daß eine massenspektrometrische Identifizierung der Stereoisomeren schwerfällt. Stereoselektive Eliminierungsreaktionen in den Molek¨l-Ionen können nicht nachgewiesen werden.In den Massenspektren der Decalin-1,4-diole treten charakteristische Unterschiede in den Intensitäten der Ionen [M — H2O]+· auf, die in übersichtlicher Weise wie bei de Cyclohexan-1,4-diolen mit der Molekülgeometrie der einzelnen Stereoisomeren in Beziehung gesetzt werden können. Die sterischen Kontrolle der H2O-Abspaltung aus den Molekül-Ionen wird durch Deuterium-Markierungen bewisen. Die Massenspektren der Stereoisomeren der 1,4-Dimethoxydecaline zeigen ebenfalls deutliche Unterschiede in den Intensitäten der [M — CH3OH]+·-Ionen. Weiterhin treten Peaks von [M — CH2O]+·-Ionen nur in den Massenspektren derjenigen Isomeren auf, bei denen in irgendeiner der Moleküklonformationen ein kurzer Abstand zwischen den Methoxygruppen errricht werden kann. Die Stereoseletivität der CH3OH- und CH2O-Eliminierungen wird gleichfalls druch Deuterium-Markierungen bewiesen.
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    Preferred electron-impact elimination of two CHO groups from A triapentafulvalenequinone. Formation of a triafulvalene radical cation?The present work is Part 75 of ‘Fulvenes and Thermochromic Ethylenes’. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 907-909 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentations of 1,2-diphenyl- and 1,2-di (phenyl-d5)-4,5-benzotriapentafulvalene-3,6-quinone indicate the preferred elimination of two CHO groups with the formation of triafulvalene radical cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070717
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    Ionisation and appearance potentials in the evaluation of nonbonded interactions - IV: Conformational effects in methyl-substituted 1,3-oxathianes (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 949-954 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ionization and appearance potentials for the molecular and [M — Me]+ ions of several stereoisomeric methyl-1,3-oxathianes were measured. The differences between the ionisation and/or appearance potentials are shown to correlate well with the conformational energy differences in question.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210070804
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    The fragmentation of ortho-methoxyphenyl-2-propanone oximes and related compounds-further examples of an ortho-effect (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 985-988 
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    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An [M — 31]+ ion was a prominent fragment in the mass spectra of three ortho-methoxy-phenyl-2-propanone oximes and is shown to be due to the expulsion of a methoxyl radical from the molecular ion as a result of an ortho-effect. In contrast, an [M — 31]+ ion was absent from the spectra of a structurally related ketone and a hydroxylamine, and was not observed in the spectra of meta- and para-methoxyphenyl-2-propanone oximes.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070808
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    Permethylation of barbiturates. Separation and characterization of the reaction products by gas chromatography-mass spectrometry (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 989-1000 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Series of barbiturates (I) has been permethylated with the methylsulfinylmethide carbanion and methyl iodide and the products (II to IV) separated, quantified and characterized by g.c.-m.s. The ratios and fragmentation patterns of II to IV are highly dependent upon the nature of the R-groups. All fragment ions have been confirmed by accurate mass measurements or perdeuteriomethylation.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070809
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  • 61
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    Mass spectra of trimethylsilyl ethers of some Δ5-3β-hydroxy C 19 steroids (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 925-948 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra (20 eV electron energy) of a wide range of %Δ5-3β-hydroxy C19 steroid TMS ethers have been examined with the aid of high-resolution mass measurements, together with deuterium and oxygen-18 labelling data. The validity of many previously proposed fragmentation modes has been confirmed. A number of ions regarded as diagnostic have been shown to be less specific than had been formerly supposed. Several novel fragmentations have been observed and investigated.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070803
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  • 62
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    An experimental and indo molecular orbital study of variable response of the p-phenyl substituent to electron demand. Relative conformations of two p-arylacetophenones as neutral molecules and +1 molecular ions (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1179-1187 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The INDO molecular orbital method suggests that the rings of p-phenylacetophenone and 2-fluoro-4′-acetylbiphenyl are more nearly coplanar in the +1 molecular ion than in the neutral molecule. This is indicated by old experimental data for the former and new data for the latter, based on the cleavage to [CH3CO]+.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071007
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  • 63
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    Echtzeit-Datenerfassungssystem mit minimaler hardware für den Einsatz in der Routine-Massenspektrometrie im organischen Laboratorium (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1215-1225 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A low-cost on-line digital computer system for data acquisition and reduction of mass spectral information from a single focusing mass spectrometer is described. The data system is designed to handle the problems most commonly encountered in routine applications in organic chemistry. By using sophisticated programming concepts a versatile user oriented system is realised on a minimal hardware configuration. Detailed information about data flow and logical structure of the programs is given.
    Notes: Zusammenfassung-Ein Echtzeit-Datenerfassungssystem für den Einsatz bei der Routineanwendung der niedring auflösenden Massenspektrometrie im organischen Laboratiorium wird beschrieben. Das Datensystem ist für die Lösung jener Probleme optimiert, die in der Routine am häufigsten auftreten. Die Verwendung aufwendiger Programme erlaubt die Realisierung eines vielseitigen, benützerfreundichen Systems mit minimaler Hardware-Konfiguration. Datenfluss und logische Struktur der Programme werden eingehend beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071102
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  • 64
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    The mass spectra of some N-substituted barbitals and their trimethylsilyl derivatives (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1227-1234 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of N-propyl and N-butyl barbitals show the loss of olefin radical (CnH2n-1) in analogy to structurally similar molecules such as N-alkyl succinimides and 3-alkyl uracils. Trimethylsilylation of the N-substituted barbitals suppresses this fragmentation and loss of olefin via apparent McLafferty rearrangement from the even-electron ion, [M - 15]+, becomes significant. The trimethylsilyl derivatives of N-allyl barbital and N-phenyl barbital show an unusually facile elimination of the appropriate isocyanate from the molecular ion.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071103
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  • 65
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    Silylgruppenwanderung und CO2-Eliminierung beim massenspektrometrischen Zerfall von N-Trifluoracetyl-α-aminosäretrimethylsilylestern (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1387-1394 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The molecular ions of N-trifluoroacetyl α-amino acid trimethylsilyl esters exhibit a characteristic elimination of CO2, in contrast to other amino acid derivatives and apparently caused by migration of the ester trimethylsilyl group to the oxygen atom of the N-trifluoroacetyl function. Fragmentation of the [M - CO2]+· ions gives rise to a series of intense peaks, especially for the aliphatic amino acid derivatives. In the case of the isomers leucine and isoleucine, different base peaks are formed for the 20 eV spectra. Amino acids which can easily split off a group in their β-position possibly fragment by synchronous elimination of CO2 and this group. With serine, threonine and cysteine a concurrent ester silyl migration to the oxygen of the β-function is observed, accompanied by the expulsion of CO2.
    Notes: Die Molekü-Ionen der N-Trifluoracetyl-α-amminosäuretrimethylsilyester zeigen im Gegensatz zu anderen Aminosäurederivaten eine charakteristische Abspaltung von CO2, offensichtlich als Folge einer Wanderung der Ester-trimethylsilylgruppe zum Sauerstoff der N-Trifluoracetylfunktion. Durch die weitere Fragmentierung der so gebildeten [M-CO2]+·-Ionen entstehen besonders bei Derivaten der aliphatischen Aminosäuren intensive Bruchstü ke. Bei den Isomeren leucin und Isoleucin führt sie sogar zu unterschiedlichen basispeaks für die 20 eV-Spektren. Aminosäuren mit leicht abspaltbarer gruppe in β-Position scheinen Co2 synochron mit dieser Gruppe zu eliminieren, so daß bei ihnen das [M-CO2]+·-Ion selbst nicht zu beobachten ist. Als Konkurrenzreaktion zur Wanserung der estersilylgruppe zum N-Triffuoracetyl-sauerstoff tritt bei Serin, Threonin und Cystein eine Si-Umlagerung zur β-ständigen funktionellen Gruppe auf. Auch sie verläuft unter gleichzeitiger Abspaltung von CO2.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071212
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    Deuterium isotope effects in mass spectrometry. Mechanism of formation of the [C6H6S]+· ion in the decomposition of s-phenyl methylthiocarbamate (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1415-1417 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the [C6H6S]+· fragment ion formed from S-phenyl methylthiocarbamate and undergoing subsequent metastable loss of CS, the hydrogen is not bound to the sulphur atom, as indicated by deuterium isotope effects on competing metastable transitions.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071216
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  • 67
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    Mass spectral studies on 7-azabicyclo (2.2.1) heptane systemsNCL Communication No. 1703. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1419-1422 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An attempt has been made to rationalise the major fragmentation modes of a few C2, C3 disubstituted 7-p-toluene sulphonyl and 7-carbobenzyloxy-7-azabicyclo (2.2.1) heptanes.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071217
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  • 68
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    Mass spectrometric fragmentations of hexafluoroacetone ketals derived from N-alkenesPresented in part at the American Society for Mass Spectrometry, 19th Annual Conference on Mass Spectrometry and Allied Topics, Atlanta Ga, 2nd to 7th May 1971. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 259-270 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric fragmentation behavior of the cyclic hexafluoroacetone ketals derived from eighteen n-alkenes is discussed with emphasis on locating the original olefinic bond. The major analytically useful fragments result from loss of CF3, loss of an alkyl side chain or loss of an aldehyde moiety from the ring. Influences of geometric isomerism on the spectra are examined by intensity ratios and ratios of competing fragmentations.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070303
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  • 69
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    The effect of stereochemistry on the mass spectra of the bis(trimethyl-silyl) esters of maleic and fumaric acids (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 291-293 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of the bis(trimethylsilyl) esters of maleic and fumaric acids provide a simple and particularly striking example of the influence of stereochemistry on the electron-impact-induced fragmentation of organic molecules. The results provide evidence for the structural significance of the m/e 147 ion, which is considerably more intense in the maleate spectrum than in the fumurate spectrum.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070307
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    Mass spectrometry of heterocyclic compounds - III.For Part II, see Ref. 1. Electron-impact-induced fragmentation of 1,2-benzisothiazole and some 3-substituted derivatives (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 327-334 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of fifteen 1,2-benzisothiazoles are reported; their fragmentation patterns have been investigated by labelling experiments, high resolution mass measurements and defocused metastable ion detection. The parent compound of the series, 1,2-benzisothiazole, eliminates HCN after partial inter-ring hydrogen scrambling. The extent of scrambling has been determined for normal daughter ions produced at different electron beam energies and also for metastable daughter ions, and is compared with the data reported for benzothiazole. Some 3-substituted derivatives show unusual fragmentation patterns. The mechanisms of these processes are under further investigation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070311
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    Advances in linear free energy relationships edited by N. B. Chapman and J. Shorter, Plenum Press, London, 1972. pp. XIV + 486. £10.00, $28.00 (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 365-365 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070316
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973) 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070401
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  • 73
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    High resolution mass spectrometry in molecular structure studies - V: The fragmentation of amaryllis alkaloids in the crinine seriesFor Part IV, see Ref. 1. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 401-415 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High resolution mass spectral fragmentation patterns of Amaryllidaceae alkaloids in the crinine series have been investigated as well as those of certain isotopically labeled derivatives. Attention is directed to the particular importance of employing entire high resolution mass spectra in attempting the elucidation of structural correlations in compounds which display few significant relative intensity variations in a complex fragmentation pattern.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070405
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    Gas phase studies of N-nitrosamines by ion cyclotron resonance spectroscopyTaken in part from the dissertation of Stephen Billets submitted to the University of Cincinnati in partial fulfilment of the PhD requirements, August, 1971. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 431-440 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The gas phase basicities of a series of cyclic and acyclic N-nitrosamines were determined by ion cyclotron resonance techniques. The fragmentation pattern and ion-molecule reactions of these compounds are discussed in terms of high resolution mass spectrometry and deuterium labeling. The presence of a unique rearrangement of the molecular ion is discussed in terms of specific ion-molecule proton transfer reactions and fragment ion products.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070407
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  • 75
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    Ion-molecule reactions of a metalloporphyrin with common perfluoro mass standards (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 497-499 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ruthenium porphyrin carbonyl (I) reacts with perfluorokerosene and perfluorotributylamine to give ions of the type [M - CO + CnF2n], n = 1 to 4.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070414
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    Field ionization mass spectrometry, by H. D. Beckey. Series of Monographs in Analytical Chemistry, Vol. 42, Pergamon Press, Oxford, 1971; 344 pages, 149 figures, 37 tables. £9.50, $20.00 (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 501-502 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070415
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  • 77
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    A new ion reaction pathway of 1,2,4-thiadiazoleCommunication No. 1744 from the Central Drug Research insttiute, Lucknow, India. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 555-558 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation pattern of 3-amino-1,2,4-oxadiazole involving a new type of hydrogen migration reaction has been discussed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070506
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    The fragmentation of some alkyl thio-phosphate esters by electron-impactPart of this work has been presented at the ‘11 Convegno di Spetrometria di Massa’ (1st to 3rd September 1971, Ispra, Italy). (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 589-599 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of the following compounds have been studied: and the fragmentation pathways established with the aid of accurate mass measurements, metastable transition and appearance potential determination. The mass spectra show that the sulphur-containing compounds (II to IV) give a stronger molecular ion that that of compound I. A further significant difference is the low intensity, in the mass spectra of II to IV, of the fragments relative to the processes that occur in I, probably because the electron removed upon ionisation belongs to the sulpher atom in compounds II to IV and to the oxygen in compound I. The isomeric compounds, (III and IV) show quite different mass spectra, The radicals containing only Phosphorus and oxygen have an ionisation potential close to 9 eV and the presence of sulphur considerably lowes this value. The measured ionisation potentials of compounds I to IV are respectively, 10·70, 9·55, 9·20 and 9·00eV. The heats of formation of compounds II and III have been estimated as -176 and -118 Kcal mole-1, respectively.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070509
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    Mass spectrometry of onium compounds-XVIII: Evaporation of N-arylpyridinium-3-oxides (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 635-638 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Comparision of the fragmentation patterns and ionisation potentials for 3-hydroxy-2-phenylpyridine and N-arylpyridinium-3-oxides shows that the latter are evaporated as mesoins. The 2,4-dinitrophenyl derivative constitutes an exception in that transarylation to the corresponding ether takes place before evaporation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070514
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    Towards A qualitative rationalisation of the fragmentation reactions of organic negative molecular ions (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 643-646 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A set of axioms is formulated which provides a means for the qualitative rationalization and prediction of the fragmentation modes of organic molecular anions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070516
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    Substituent effects on rearrangements in aromatic aldoximesN.C.L. Communication No. 1632. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 715-717 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of substituents on hydrogen and hydroxyl transfer in substituted benzaldoximes reveals interesting differences. A possible explanation in terms of radical electron site and charge site is suggested.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070607
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    Heterocyclic studies - XXX:For Part XXIX, see Ref. 1. Application of mass spectrometry to the study of covalent hydration (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 737-752 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Comparison of the mass spectra of 3,4-hydrated 4-trifluoromethylpteridine derivatives with those of corresponding anhydrous compounds shows that this technique can be used to deduce the position of covalent hydration in heterocyclic compounds.It is less easy to demonstrate the presence of added water molecules in 5,6,7,8-dihydrated derivatives of ethyl pteridine-4-carboxylates, but spectra run at low ionising voltages give the required information.Two hydrates (3,4-hydrates of 4-ethoxycarbonyl- and 4-trifluoromethyl-pteridine-2(1H)-thione) which are very much more thermally stable than usual are also discussed.Metastable peaks and accurate mass measurements support many of the postulated fragmentation pathways.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070609
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    The mass spectra of cyclo-tripeptides of B-alanine and 3-amino-3-methyl butanoic acid (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 779-780 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The cyclo-tripeptides of B-alanine and of 3-amino-3-methyl butanoic acid have been synthesised, the latter for the first time, and structures were confirmed by elemental analysis and mass spectrometry; accurate mass measurements showed that carbon monoxide was lost from the molecular ions; prominent peaks in the mass spectrum of both cyclic peptides are otherwise consistent with those reported for α-peptides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070702
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    Elektronenstossinduzierte fragmentierung von polymethylbenzaldehyden - II:Für I Mitteilung, siehe Lit. 1. Mechanismus der Methyl-Abspaltung aus dem Molekül-Ion von Tri- und Pentamethylbenzaldehyden (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1001-1003 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The electron-impact-induced elimination of CH3 from tri-and pentamethylbenzaldehydes can be explained by the mechanism of a vinylogous α-cleavage. Rearrangements can be excluded.
    Notes: Die elektronenstossinduzierte Methyl-Abspaltung aus Tri-und Pentamethylbenzaldehyden kann durch eine vinyloge α-Spaltung erklärt werden. Umlagerungen können ausgeschlossen werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070810
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  • 85
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973) 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070901
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  • 86
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    International mass spectrometry conferences. One man's recollections (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1013-1017 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070902
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  • 87
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    The mass spectra of ω-amino acid derivatives. The role of ω-activation in production of ions upon electron-impactPresented in part at the ASMS, 20th Annual Conference on Mass Spectrometry and Allied Topics, Dallas, Texas, June 1972. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1083-1090 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of a series of N-phthaloyl and N-trifluoroacetyl derivatives of ω-amino acids ranging from 3-aminopropionic acid to 6-aminohexanoic acid were determined. Ions of significant intensity resulting from the loss of neutral fragments from precursor ions were observed. Deuterium labeling studies indicate the initial fragmentation loss of a neutral molecule; i.e. the loss of water from the molecular ion involves ω-hydrogen loss from the alkyl chain. A fragmentation scheme consistent with metastable, high resolution and deuterium labeling data is presented.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070909
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  • 88
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    Forthcoming papers (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. i 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071111
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  • 89
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    Ion structural studies by ion kinetic energy spectrometry: [C7H7]+, [C7H8]+·, [C7H7OCH3]+· (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1303-1312 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of kinetic energy release measurements in the structural characterization of ions formed in the mass spectrometer and in the determination of fragmentation mechanisms is demonstrated. In combination with information on the mode of energy partitioning in some of these reactions this allows the following conclusions: (i) The metastable [C7H8]8· ions formed from toluene, cyclohepatatriene, n-butylbenzene, the three methyl anisoles, methyl tropyl ether and benzyl methyl ether all undergo loss of H· from a common structure. (ii) The metastable [C7H7]+ ions generated from the same sources and from benzyl bromide, benzyl alcohol, p-xylene and ethylbenzene appear to undergo loss of acetylene from both the benzylic and the tropylium structures. (iii) The metastable [C7H7OCH3]+· ether molecular ions undergo loss of CH3· by two types of mechanism, simple cleavage to give the aryloxy cation (not observed for benzyl methyl ether) and a rearrangement process which appears to lead to protonated tropone as the product. (iv) Loss of formaldehyde from the metastable [C7H7OCH3]+· molecular ions involves hydrogen transfer via competitive 4- and 5-membered cyclic transition states in the case of the anisoles and in the case of methyl tropyl ether, while for benzyl methyl ether, hydrogen transfer in the nonisomerized molecular ion occurs via a 4-membered cyclic transition state to yield the cycloheptatriene molecular ion.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071110
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  • 90
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    Publisher's announcement (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. i 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071202
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  • 91
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    Mass spectra of some syn- and anti-aromatic aldoximes (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1337-1343 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of eight pairs of geometric isomers of aromatic oximes and four other single aromatic oximes are reported. The loss of H2O, HO and HCN are major fragmentations from the molecular ion of all the benzaldoximes studies; however, the loss of HCN from the molecular ion did not occur in the oximes of 9-phenanthraldehyde, 1-naphthaldehyde and 2-naphthaldehyde. The halogen substituted benzaldoximes eliminate HCNO and H2CNO forming an additional fragmentation pathway from the molecular ion. In general, variations were found for each pair of syn- and anti-oximes but no consistent patterns could be found in the spectra for all the syn-isomers versus all of the anti-isomers. The geometric isomerism of four oximes previously reported in the literature have been established for the first time as anti-m-bromobenzaldoxime, syn-9-phenanthraldoxime, syn-1-naphthaldoxime and syn-2-naphthaldoxime. Three new oxime acetates were prepared and their mass spectra are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071206
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  • 92
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    Substituent and H/D randomization in the mass spectra of substituted diphenylacetylenic compoundsIssued as NRCC No. 13254. (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1329-1336 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of several substituted diphenylacetylenes are reported and the [metastable ion]/[daughter ion] ratios for the isomeric chloro- and bromodiphenylacetylenes suggested substituent scrambling in their respective molecular ions. The metastable ion data also indicated equilibration of the chloro substituents in a series of isomeric dichlorodiphenylacetylenes. In addition, the fragmentation patterns for the amino- and nitrodiphenylacetylenes differed somewhat from most other aromatic amino and nitro compounds. The aminodiphenylacetylenes fragment with expulsion of H2CN from the molecular ion and the expulsion of HCN from the [M - 1]+ ion was only a relatively minor reaction. 4-Nitrodiphenylacetylene loses NO from the molecular ion and OH from the [M - NO]+·, whereas the more familiar loss of OH from the molecular ion was not observed. The mass spectra of several deuterated substituted diphenylacetylenes clearly showed extensive (but not complete) H/D equilibration in the molecular ion or some subsequent decomposition ion. Comparative studies between 4-chloro and 4-bromo substituted biphenyl, diphenylacetylene and diphenyldiacetylene indicated similar degrees of H/D randomization, and the results showed that the —C≡C— group did not inhibit the proton equilibration between the two phenyl groups.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071205
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  • 93
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    Mass spectral studies of some complexes of niobium(V) and tantalum(V) with chloro, alkoxy, acetylacetonato or salicylaldehydato ligands (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1357-1365 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of complex compounds of niobium (V) and tantalum (V) of the type MCl2(OR)2L have been measured, where M = Nb and Ta; HL = 2,4-pentanedione, R = CH3, C2H5 and HL = Salicyladehyde, R = CH3. The fragmentation upon electron-impact depends on the nature of the ligands and to a minor extent on the central metal atom. A fragmentation scheme has been constructed on the basis of measurements of metastable transitions and accurate masses of important fragment ions. Rearrangement reactions involving hydrogen migration among ligands have been observed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071209
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  • 94
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    Electron-impact spectra of ms-tetra-phenylchlorins and the stability of chlorins (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1395-1397 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrum of ms-tetraphenylchlorin was observed to contain a significant porphyrin peak. Attempts to obtain metallochlorin spectra yeilded mainly metalloporphyrin spectra. Sublimation experiments established that the chlorin to porphyrin conversion resulted from electron-impact excitation and did not arise from thermolysis on the probe or from impurities. In conjunction with previous literature data, this is interpreted as showing that the apparent stability of chlorins with respect to porphyrins is mainly a matter of the activation energies required under specific constraints.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071213
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  • 95
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    The benzoyl cation: The participation of isolated electronic excited states in the dissociation of molecular ions of the form [C6H5COX]+· (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1407-1413 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The heat of formation of the benzoyl cation generated from [C6H5COX]+· is found to depend on X, while the heat of formation of the phenyl ion produced therefrom is, with one exception, independent of X. The excess energy of the benzoyl cation can be accounted for by an electronic excited state of the ion in the mass spectra of benzoic acid, benzaldehyde, benzamide, methyl benzoate and possibly benzophenone; the benzoyl cation is not excited in the mass spectra of acetophenone and benzoyl chloride.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071215
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  • 96
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    Field ionisation mass spectrometry of acetylpyridine isomers (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1423-1424 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An investigation of the metastable transition in the field ionisation mass spectra of acetylpyridine isomers has established that the reaction pathway is greatly influenced by the ring position of the substituent. It is suggested that the pyridine nitrogen atom induces a rearrangement process in the case of 2-acetylpyridine. In other acetylpyridines it has a little effect and the cleavage reaction occured prior to rearrangement.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071218
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  • 97
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    Masthead (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973) 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070101
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  • 98
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    On the positional interchange of the phenyl- and hydroxyl groups in the [C9H11O]+-ion, generated from 2-methyl-2-phenylpropane-1,3-diol (C10H14O2) upon electron-impact (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 37-43 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is shown by deuterium-labelling experiments, that a substantial part of the [M - CH2OH]+-ions from 2-methyl-2-phenyl-propane-1,3-diol must have rearranged to carbonyl-oxygen protonated phenylacetone by a positional interchange of the phenyl- and hydroxyl groups prior to decomposition.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070107
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  • 99
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    Mass spectra of 1,2,4-triazoles - II:Part I: A. J. Blackman and J. H. Bowie, Australian J. Chem. 25, 335 (1972). This paper also constitutes Part LXXII in the series Electron-Impact Studies; Part LXXI, Australian J. Chem. 25, 1107 (1972). Alkyl 1,2,4-triazoles (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 57-64 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of monomethyl 1,2,4-triazoles contain fragment ions produced by specific cleavage of the heterocyclic ring. A major fragmentation from many molecular ions involves the elimination of HCN, but loss of N2 is either very small or completely absent. No N or H scrambling occurs within the triazole ring system, as evidenced by labelling studies. The loss of a hydrogen atom from the molecular ions of 3-alkyl-1,2,4-triazoles (alkyl ≥ C2H5) originates from hydrogens attached to the β carbon and nitrogen atoms.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070110
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  • 100
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    Mass spectrometric studies of some 4-acyl substituted 1-phenyl-3-methyl-5-pyrazolones (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 89-96 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron-impact-induced fragmentation of 1-phenyl-3-methyl-5-pyrazolone and six 4-acyl substituted derivatives, have been studied with the aid of deuterium labelling, high resolution mass measurements and the metastable defocusing technique. The mass spectra of the pure keto and the pure enol forms do not show any significant differences. The predominant decomposition of the 4-acyl substituted pyrazolones is the α-cleavage with respect to the carbonyl group leading to intense peaks at m/e 201 by loss of the alkyl group. In the case of benzoyl and ethoxycarbonyl derivatives the α-cleavage is associated with a specific hydrogen rearrangement causing the loss of a benzene and an ethyl alcohol molecule, respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070114
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