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  • 1985-1989
  • 1970-1974  (303)
  • 1890-1899
  • 1971  (303)
  • Analytical Chemistry and Spectroscopy  (300)
  • pharmacokinetics
Source
Material
Years
  • 1985-1989
  • 1970-1974  (303)
  • 1890-1899
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Berechnung einer Zusatzdosis zur Erhaltung der Serumkonzentration eines Pharmakons nach Schnellinfusion von Plasmaexpandern (1971)
    Springer
    European journal of clinical pharmacology 4 (1971), S. 54-58 
    Details
    ISSN: 1432-1041
    Keywords: pharmacokinetics ; infusion ; plasma expander ; blood level fluctuation ; sulfonamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Summary A hypothetical pharmacokinetic model is reported which describes the decreasing fluctuations in the blood levels of a sulfonamide during infusion of a plasma expander. Its concentration in the serum increases reciprocally with the amount of plasma expander infused. These procedures can be described by simple equations, and it is possible therefore, to calculate the dose required to maintain a constant blood level during the infusion.
    Notes: Zusammenfassung Es wird über ein hypothetisch-pharmakokinetisches Modell berichtet, welches sich mit der absinkenden Serumkonzentration eines Sulfonamids nach Infusion eines Plasmaexpanders beschäftigt. Die Serumkonzentration fällt reziprok zur infundierten Menge des Plasmaexpanders ab. Die Vorgänge lassen sich durch einfache Gleichungssysteme beschreiben. Es gelingt daher, eine Zusatzdosis zu berechnen, welche den bei Infusionsbeginn bestehenden Plasmaspiegel annähernd konstant erhält.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568900
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of a sustained release form of the oral antidiabetic butylbiguanide (Silubin® retard) (1971)
    Springer
    European journal of clinical pharmacology 3 (1971), S. 221-228 
    Details
    ISSN: 1432-1041
    Keywords: Biguanides ; butylbiguanide ; pharmacokinetics ; sustained release form
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In man, after oral administration of 50 mg14C-butylbiguanide, the maximum serum concentration was 26–41 µg/100 ml. The biguanide was eliminated with an average half-life of 2h. 84% of the dose administered was found excreted unchanged in the urine. — After administration of14C-butylbiguanide in a sustained release form (Silubin® retard), the drug was slowly released and its serum concentration remained almost constant for up to 7 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565010
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  • 3
    Electronic Resource
    Electronic Resource
    Ursachen der Potenzierung der hypoglykämischen Wirkung von Sulfonylharnstoff-Derivaten durch Medikamente (1971)
    Springer
    European journal of clinical pharmacology 4 (1971), S. 32-37 
    Details
    ISSN: 1432-1041
    Keywords: Glibenclamide ; pharmacokinetics ; metabolism ; potentiation of hypoglycemic action ; phenylbutazone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Summary Metabolically healthy subjects were given an intravenous injection of 1,13 mg14C-labelled glibenclamide (HB 419). The plasma level, renal elimination of the radioactivity and metabolism of the substance were investigated. Two minutes after administration the HB 419 is virtually present only in the blood and at the end of the distribution period mostly in the extracellular space. 53% of the radioactivity is excreted via the kidneys in the form of metabolites. If glibenclamide is administrated in the same way to the same subjects after pretreatment with phenylbutazone there are no differences in the course of the plasma levels or the rate of elimination from the blood. There is, however, a significant difference in the excretion of the radioactivity in the urine. In the presence of phenylbutazone significantly less HB 419 metabolite is excreted renally. In view of the known alternative route of elimination it is suggested that the amount not excreted in the urine is in compensation eliminated via the bile. There was no difference in the metabolism of glibenclamide between the control and phenylbutazone treated groups. The potentiation by phenylbutazone of HB 419 action, and probably also that of other antidiabetic sulphonylureas, must therefore be due predominantly to other causes (Communication III).
    Notes: Zusammenfassung Stoffwechselgesunde Versuchspersonen erhielten14C-markiertes Glibenclamid in einer Dosis von 1.13 mg/Vpn i.v. gespritzt. Plasmaspiegelverläufe, renale Elimination der Radioaktivität und die Metabolisierung der Substanz wurden untersucht. Zwei Minuten nach der Applikation ist HB 419 praktisch nur im Blutund nach Abschluß der Verteilung weitgehend im Extracellulärraum vorhanden. 53% der Radioaktivität werden über die Nieren in Form von Metaboliten ausgeschieden. Wird den gleichen Probanden nach Prämedikation mit Phenylbutazon Glibenclamid in gleicher Weise verabfolgt, ergibt sich kein Unterschied hinsichtlich der Plasmaspiegelverläufe und der Eliminationsgeschwindigkeit aus dem Blut. Ein signifikanter Unterschied besteht jedoch in der Ausscheidung der Radioaktivität in den Harn (26.3%). In Gegenwart von Phenylbutazon wird ein signifikant geringerer Anteil von HB 419-Metaboliten renal eliminiert. Aufgrund des bekannten zweiten Ausscheidungsweges wird vermutet, daß der fehlende Anteil kompensatorisch über die Galle eliminiert wird. Die Metabolisierung von Glibenclamid weist keine Differenzen zwischen Phenylbutazon-und Kontroll-Gruppe auf. Die Wirkungspotenzierung von HB 419 — wahrscheinlich auch diejenige anderer antidiabetisch wirksamer Sulfonylharnstoffe — durch Phenylbutazon dürfte demnach überweigend andere Ursachen haben. (Mitteilung III).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568896
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  • 4
    Electronic Resource
    Electronic Resource
    1,4 elimination of C6H6 in the mass spectral fragmentation of 1-phenyltetralin (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 99-101 
    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.1210050114
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the syntheses of azole derivatives - V:For Part IV, see Ref. 1. The mass spectra of 1,2,4-triazoles and oxadiazoles (studies on the syntheses of heterocyclic compounds - CCCLXXIVFor Part CCCLXXIII, see Ref. 2.) (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 117-122 
    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 twenty 3-alkyl-1-phenyl-Δ2-1,2,4-triazolin-5-ones, three 1-phenyl-1,2,4-triazolin-3,5-diones and ten 2-alkyl-4-phenyloxadiazolin-5-ones has been studied by conventional mass spectrometry. The major cleavages take place in the 1-phenyl-Δ2-1,2,4-triazolin-5-one nucleus, producing three major fragment ions. 4-Phenyloxadiazolin-5-ones exhibit a similar fragmentation pattern to 1-phenyl-Δ2-1,2,4-triazolin-5-ones. Furthermore, several additional fragmentation processes are observed in the case of specific 1,2,4-triasolines.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050203
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  • 6
    Electronic Resource
    Electronic Resource
    Mass spectra of some furanosesquiterpenesCommunication No. 1304 from National Chemical Laboratory, Poona-8, India. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 187-195 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some of the fragmentation modes operating in a few furanosesquiterpenes have been established from accurate mass measurements and metastable data.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050209
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  • 7
    Electronic Resource
    Electronic Resource
    Forthcoming events (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 235-236 
    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.1210050214
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  • 8
    Electronic Resource
    Electronic Resource
    Electron-impact induced fragmentation of partially fluorinated β-diketones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 237-248 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ionic fragmentation of twelve partially fluorinated β-diketones, RCOCH2COCF3 was studied with a medium resolution mass spectrometer. In addition to the anticipated fragmentation by β-cleavage, a number of interesting rearrangements are observed. [CF3COCH2CO]+., an ion common to all of the compounds investigated, decomposes predominantly by elimination of HF. When R is an alkyl group containing hydrogen γ to the adgacent carbonyl, the McLafferty rearrangement occurs. The [RCOCH2CO]+.ion eliminates neutral RH when R is phenyl, thienyl, or cyclopropyl. An intense metastable peak, absent when R is an alkyl substituent, accompanies the rearrangement in these three compounds. A number of fragments characteristic of the R substituent are also observed in many cases. This is interpreted as indicating a considerable degree of charge localization on the R moiety.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050302
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  • 9
    Electronic Resource
    Electronic Resource
    Gas chromatographic and mass spectrometric characteristics of some bicyclic thioketones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 297-301 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three bicyclic thioketones were examined by combined gas chromatography-mass spectrometry. Deuterium labelling was employed in the interpretation of the fragmentation processes in thiocamphor. Compared with the oxygen analogues, the thiones yielded on electron-impact a higher proportion of characteristic fragment ions containing the hetero-atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050307
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  • 10
    Electronic Resource
    Electronic Resource
    Mass spectrometry in structural and stereochemical problems - CXCIXFor preceding paper see Y. M. Sheikh, A. M. Duffield and C. Djerassi, Org. Mass Spectrom. 4, 273 (1970). Contrasting fragmentations of singly- and doubly-charged o-, m- and p-hydroxyalkylphenones and their trimethylsilyl ethers (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 505-523 
    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 spectrometry, metastable defocusing and deuterium labeling of trimethylsilyl (TMS) ethers have been used to study the electron-impact induced fragmentations of o-, m- and p-hydroxyalkylphenones and their TMS ether derivatives. These derivatives have proven useful in contrasting the fragmentation patterns of singly- and doubly-charged ions because of the competing fragmentations: α-cleavage and a McLafferty rearrangement from the ketone moiety and methyl cleavage from the TMS group. A proximity effect was responsible for a markedly increased methyl radical loss from the o-TMS ether. This fragmentation was minor with the m- and p-isomers. Significantly intense doubly-charged ions were formed from ketonic cleavage and by the loss of a TMS methyl radical. The sequence of fragmentation depended on the size of the alkyl group attached to the ketone carbonyl. There was no evidence found for a McLafferty rearrangement occurring from the doubly-charged molecular ion of the TMS ethers of the hydroxyalkylphenones but the rearrangement occurred from the doubly-charge molecular ion of bis-3-(1-oxopentyl)-4-hydroxy-phenyl-methane and, of course, from the singly charged [M]+. The bis-p-hydroxyphenylmethane derivatives were studied in an effort to increase the intensity of the doubly-charged ions as it was expected that the charges would be separated by a longer distance.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050503
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  • 11
    Electronic Resource
    Electronic Resource
    Vapor phase bimolecular reactions of alkyl siliconium and other metal ions in mass spectrometry (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 599-604 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The vapor phase reactions of various metal alkyl and alkoxy ions are discussed. Ions produced from suitable precursors can react with neutral molecules which contain an electronegative site. It appears that ions containing a positively charged silicon, tin, germanium or mercury center are more reactive than corresponding carbonium ions.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050510
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  • 12
    Electronic Resource
    Electronic Resource
    Mass fragmentation and structure of siphonaxanthin, siphonein and derivatives (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 565-572 
    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 spectrometry has been employed to establish the structural formulae of the unique carotenoid pigment siphonaxanthin, its natural ester, siphonein and several derivatives. Siphonaxanthin exhibits a fragmentation reaction that is unusual among carotenoid pigments, namely, the elimination of carbon dioxide, observed as [M - CO2] and [M - (CO2 + H2O)]. This reaction involves the migration of an oxygen atom. Siphonaxanthol, a partially hydrogenated siphonaxanthin, exhibits a similar reaction involving the elimination of carbon monoxide and formaldehyde. From the fragmentation of derivatives of siphonaxanthin, such as the triacetate, the dimethyl ether and siphonaxanthol, and also from the fragmentation of related pigments, such as loroxanthin and fucoxanthin, the unique structural units responsible for the elimination of the carbon dioxide and carbon monoxide have been identified.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050508
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  • 13
    Electronic Resource
    Electronic Resource
    Mass spectral fragmentation studies in monomeric and dimeric coumarinsFinancial support from the Natinal Research Council of Canada is gratefully acknowledged. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 249-263 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study on the behavior of a large number of monomeric and dimeric coumarins in the mass spectrometer is reported and discussed. The results illustrate that the observed characteristic fragmentation patterns are of considerable utility in the application of mass spectrometry to structure elucidation in this series.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050303
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  • 14
    Electronic Resource
    Electronic Resource
    The behaviour of perchloro-3,4-dimethylenecyclobutene,-pentafulvene and- pentafulv-alene under electron-impactSee Ref. 1. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 289-295 
    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 1,2-dichloro-3,4-bis(dichloromethylene)cyclobutene (IV) and of hexachloropentafulvene (II) have been studied. Compound IV cannot be an intermediate in the formation of II from octachloro-1,2-dimethylenecyclobutane (III) under electron-impact, as previously suggested. In the mass spectra of II and IV the species [C6]+ and [C5]+ occur, obviously through cleavage of the semicyclic C-C bond.The mass spectrum of pentachlorofulvalene (VI) shows strikingly that successive elimination of an even number of CI atoms is preferred over that of an odd number of CI atoms; probably corresponding C-CI bonds in the two rings are broken simultaneously. Amongst the fragments, the species [C10]+ and [C7]+ and possibly also [C8]+ and [C9]+ have been observed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050306
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  • 15
    Electronic Resource
    Electronic Resource
    Rearrangements in the electron-impact induced fragmentation reactions of 5-alkylthio-1,3,4-thiadiazolyl-2-amines (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 317-324 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low resolution mass spectra of a number of homologous 5-alkylthio-1,3,4-thiadiazolyl-2-amines have been determined. With the methylthio compound the only significant loss from the molecular ion is the sulphydryl radical. As the homologous series is ascended this reaction becomes less important and is insignificant with the butylthio isomers. The ethylthio compound suffers extensive loss of ethylene and when the alkyl group contains three or more carbon atoms the main reaction is always loss of the olefin coresponding to the alkyl group.All of the n-alkylthio compounds showed in addition loss of methylthio radical from the molecular ion. A mechanism is proposed and comparisons made with alkyl phenyl thioethers and alkylthio substituted heterocycles.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050310
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  • 16
    Electronic Resource
    Electronic Resource
    Mass spectrometry of pyridine compounds - II:For Part I, see Ref. 1. Hydrogen exchange in the molecular ions of isonicotinic - and nicotinic acid as a function of internal energy (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 735-742 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From the mass spectra of site-specifically deuterated analogues of isonicotinic acid it appears that the molecular ion eliminates hydroxyl and water after an exchange between the hydroxylic and β-hydrogens. The percentage of exchange in these reactions depends on the internal energy of the molecular ion and is shown to be 53 to 57% in the ion source, 92 to 97% in the first and ∽ 100% in the second field free regions.Furthermore, the isotope effect i, operative in the loss of water, increases with decreasing internal energy of the molecular ion, being 1.6, 2.0 and 2.3 in the ion source, first- and second field free regions, respectively.In the molecular ions, losing successively hydroxyl and carbon monoxide as deduced from diffuse peaks in the first-and second field free regions, a substantially lower percentage of exchange (ca. 20%) is found, which is due to the higher internal energy of these molecular ions.In the molecular ion of nicotinic acid only one of the ortho hydrogens (α) is involved in the exchange of hydrogen. The percentage of exchange for loss of hydroxyl in the ion source is 66%. Molecular ions, which successively eliminate hydroxyl and carbon monoxide, show a 45% exchange of hydrogen as calculated from diffuse peaks in the first- and second field free regions.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050612
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  • 17
    Electronic Resource
    Electronic Resource
    Field ionization mass spectrometry - III: Cardenolides (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 573-597 
    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 (EI) and field ionization (FI) mass spectra of some representative underivatized cardenolides have been studied together for the first time, with the objective of assessing the structural and in particular the sequence information afforded by this promising analytical method. Two series of cardenolides have been examined, each consisting of a mono-, di- and trisaccharide glycoside. The first was based on the aglycone digitoxigenin and comprised neriifolin, thevebioside and cerberoside; the second was based on the genin strophantidin and included cymarin, K-strophantin-β and K-strophantoside. Other cardiac glycosides investigated and discussed include digitoxin and helveticoside. Important and structurally diagnostic fragmentations have been uncovered, especially in FI mode. In addition, the EI and FI spectra of individual components of the cardenolides have been recorded, e.g. the genins digitoxigenin and strophantidin, and the mono-saccharides L-thevetose, D-cymarose and D-glucose.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050509
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  • 18
    Electronic Resource
    Electronic Resource
    Masthead (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971) 
    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.1210050601
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  • 19
    Electronic Resource
    Electronic Resource
    Mass spectra of partially fluorinated β-diketonato complexes of Al(III), Cr(III), Fe(III) and Co(III) (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 633-649 
    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 Al(III), Cr(III), Fe(III) and Co(III) complexes of the anions of hexafluoroacetylacetone (hfac) trifluoroacetylacetone (ttac), benzoyltrifluoroacetone (btac) and thenoyltrifluoroacetone (ttac) have been determined and are discussed here. Emphasis is placed on discerning which of the observed reactions may properly be attributed to the influence of the metal in the complex and those which may be thought of as arising from the nature of the ligand. The most important influence of the coordinated metal is related to its ability to be reduced2; however, the presence of the metal serves to prohibit or facilitate certain rearrangement reactions relative to the free protonated ligand. Since essentially all fragmentation occurs within or by loss of a ligand, the nature of the ligand determines the nature of the observed fragments. Where intramolecular com-petition of fragment types is possible (tfac, btac and ttac complexes), the most probable fragment of a given class, odd electron or even electron, is easily determined. The most commonly eliminated fragments are CF3and CF2. Certain metastable peaks are associated with consecutive decomposition in the field free region. Such a phenomenon appears to be common for molecules of the type studied here.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050603
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  • 20
    Electronic Resource
    Electronic Resource
    Forthcoming events (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1132-1132 
    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.1210050917
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  • 21
    Electronic Resource
    Electronic Resource
    General aspects of the mass spectra of some benzyloxyalkyl substituted purine and pyrimidine nucleoside analogues; A demonstration of the concept of charge localizationIn part taken from the thesis of W. F. A. Grose, Amsterdam 1971. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 833-838 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecular ions of the title compounds appear to lose a molecule of benzaldehyde or a benzyl radical. The first reaction is followed by the elimination of a second molecule of benzaldehyde, the second reaction by either the expulsion of a molecule of benzaldehyde or a molecule of benzylalcohol. These degradations can be readily explained by assuming charge localization in the purine or pyrimidine part of the molecular ions. For the successive loss of a benzyl radical and of a molecule of benzaldehyde from the molecular ions, however, charge localization at one of the ether oxygen atoms may also be responsible to some extent, as demonstrated by the mass spectrum of 1,3-dibenzyloxy-2-ethylpropane.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050708
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  • 22
    Electronic Resource
    Electronic Resource
    Concerning the structure and fragmentation of [C3H7O]+ ions derived from alcoholsThe work reported here will constitute part of the thesis to be submitted by C. W. T. to the University of Toronto for the PhD degree. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 877-884 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation of [CH2OH]+. by fragmentation of [C3H7O]+. ions in the electron-impact mass spectra of 2-methyl-2-propanol and 2-propanol has been investigated using 13C labeling, deuterium labeling and metastable studies. The similar fragmentation reaction in the chemical ionization mass spectrum of acetone has been studied. It is concluded that the fragmentation reaction does not involve complete randomization of the carbon atoms and therefore does not proceed through formation of a hydroxylated cyclopropane intermediate. Alternative mechanisms are discussed.
    Additional Material: 4 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210050714
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    Electronic Resource
    Masthead (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971) 
    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.1210050801
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  • 24
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    Mass spectra of organometallic compounds - XIII: Metal carbonyl complexes of tris(dimethylamino)arsineFor Part XII of this series see reference 1. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 939-944 
    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 tris(dimethylamino)arsine metal carbonyl complexes [(CH3)2N]3-AsM(CO)5 (M = Cr, Mo and W), trans-[(CH3)2N]3AsCr(CO)4As[N(CH3)2]3 and [(CH3)2N]3-AsFe(CO)4 were examined and compared with those of the corresponding tris(dimethylamino)-phosphine complexes. The molecular ions in the mass spectra of the tris(dimethylamino)arsine complexes have a greater tendency to eliminate a (CH3)2N fragment than the molecular ions in the mass spectra of the corresponding tris(dimethylamino)phosphine complexes. The mass spectrum of the tungsten derivative [(CH3)2N]3AsW(CO)5 exhibits not only the usual series of ions [(CH3)2N]3-AsW(CO)n+ and [(CH3)2N]2AsW(CO)n[+ but also the series of ions (CH3)2NAsW(CO)n]+ (n = 5, 4, 3, 2, 1 and 0) and even the nitrogen-free ions [AsW(CO)n]+ (n = 2, 1 and 0). Metastable ion evidence was obtained for arsine (AsH3) elimination from the [(CH3)2N]2AsFeH+ ion in the mass spectrum of [(CH3)2N]3AsFe(CO)4.
    Additional Material: 4 Tab.
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    URL: http://dx.doi.org/10.1002/oms.1210050805
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    The structure of the product ion of a ‘McLafferty’ rearrangement (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 967-975 
    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 alkylphenylketones has been examined. Whenever the alkyl chain is three or more carbon atoms long, the well-known McLafferty rearrangement occurs with elimination of the elements of a neutral olefin. The further fragmentation of the ion formed in this rearrangement reaction has been studied using the technique of ion kinetic energy (IKE) spectroscopy. The measured release of kinetic energy has been used to show that the rearrangement ion has an enolic type structure.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050809
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    Introduction to Molecular Spectroscopy, E. F. H. Brittain, W. O. George and C. H. J. Wells. Academic Press, London and New York, 1970, pp. 387 + ix. £6.00 (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1027-1027 
    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.1210050818
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  • 27
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    Mass spectra of β-quinuclidones and β-benzquinuclidones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1029-1041 
    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 quinuclidone-3, benzquinuclidone-3, 2-azaquinuclidone-3, 2-azabenzquinuclidone-3 and some of their functional substituted derivatives have been investigated. Fragmentation of the compounds investigated has been shown to proceed through the open form of the molecular ion with cleavage of a bridgehead bond containing the carbonyl group and subsequent elimination of carbon monoxide.
    Additional Material: 8 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050902
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  • 28
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    Rearrangements in the electron-impact induced fragmentation of some β-aroyl-α-methylpropionic acids (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1081-1084 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A complex rearrangement on electron-impact for β-aroyl-α-methylpropionic acids, involving both hydrogen and hydroxy migration followed by loss of carbon monoxide and allyl radical, is described and discussed. The rearrangement process, resulting in an ion [ArCOOH2]+, is favoured by electron-withdrawing substituents in the aromatic ring.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050907
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    Elektronenanlagerungs-massenspektrographie organischer substanzen, by M. von Ardenne, K. Steinfelder and R. Tümmler, Dresden. Springer-Verlag, Berling-Heidelberg-New York, 1971, pp. 403 + VIII, 109 diagrams. $19.70, DM68.00 (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1455-1455 
    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.1210051211
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    Studies in mass spectrometry - XVI.For Part XV, See Ref. 1. The striking difference between the mass spectra of stereoisomeric cyclic anhydrides (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1345-1346 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Elimination of CO gives rise to prominent peaks in the mass spectra of cis-1,2,3,6-tetrahydrophthalic anhydride (Ia) and its 4,5-dimethyl analogue which are almost absent in the corresponding trans-isomers. The striking difference in the fragmentation of the isomers shows that practically no rearrangement in the molecular ion occurs prior to this fragmentation. In this case a high degree of stereospecificity is observed, although hydrogen migration is apparently not involved in the process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210051113
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    The mass spectra of isomeric hydrocarbons - I: Norbornene and nortricyclene; The mechanisms and energetics of their fragmentations (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1349-1362 
    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 norbornene, nortricyclene and deuterium labeled derivatives thereof have been studied. The appearance potentials of the ions [C7H10]+·, [C7H9]+, [C6H7]+ and [C5H6]+· have been determined for both compounds and heats of formation of the hydrocarbons have been estimated. Detailed fragmentation schemes are proposed for the molecular ions and it is concluded that they dissociate by essentially different mechanisms which do not involve common intermediates. The structures and energy contents of the primary fragment ions are discussed in detail by comparing energetics, labeling experiments and metastable ion abundances.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210051202
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  • 32
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    Loss of CH2O and H2O by stepwise mechanisms in mass spectrometry (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1391-1397 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Experimental evidence demonstrating reversible hydrogen transfer between specific positions in the molecular ions of anisole and o-toluic acid suggests stepwise mechanisms for the loss of CH2O and H2O, respectively. Added support for a stepwise mechanism for the loss of CH2O is found in the mass spectra of pyridine and quinoline analogues.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210051206
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    The mass spectra of some corticosteroid boronates (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1429-1453 
    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 methyl, n-butyl, t-butyl, phenyl and cyclohexyl boronates of various classes of steroid are reported and discussed. Steroid types represented are 17α, 21-dihydroxy-20-ketones, 17α, 20, 21-triols, 17α, 20-diols, 20, 21-ketols. Each gives rise to characteristic fragmentation modes, although derivatives of the 20α- and 20β-hydroxy compounds have similar spectra.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210051210
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    Electron-impact and molecular dissociation - XXI: Some studies on substituted indolosteranes (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1189-1196 
    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 substituted indolosteroids have been obtained. With one or two exceptions these are some value in structural analysis; the N-benzyl compounds are exceptional in this. One interesting observation is that substituents such as the oximino- or nitro-groups only have a marginal effect upon the fragmentation-pattern except on the masses of the various fragment ions.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210051008
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    Mass spectral fragmentation patterns of isomeric s-Triazolo[4,3-a]pyridines and s-triazolo[1,5-a]pyridinesSee Ref. 1. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1-13 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The major decomposition pathway involved in the fragmentation of derivatives of the title ring systems was the loss of RCN from the five-membered ring, except when this ring had a 3-amino,3-hydroxyl or 3-mercapto substituent. In these cases, the exocyclic substituent and at least one nitrogen atom from the five-membered ring were lost.
    Additional Material: 9 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050102
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    Studies in mass spectrometry - XV:For Part XIV, see Ref. 1. Retro-diels-alder fragmentation and double hydrogen migration in some polycyclic diketones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 53-59 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In contrast to adducts I of bi-1-cycloalken-1-yls and p-benzoquinone, their reduction products II do not exhibit a double hydrogen migration from δ positions accompanying a ‘retro-Diels-Alder’ type fragmentation. An ordinary retro-Diels-Alder fragmentation was found to take place, with charge retention in the diene portion of the molecule. A double hydrogen migration has been detected in II leading to m/e 112 ion c2, which differed, however, from that in I in charge retention and in the origin of the migrating hydrogen atoms. Adducts III of di-1-cycloalken-1-yls and naphthoquinone behave similarly to II. They exhibit relatively low abundance ions a, however, due to a double hydrogen migration from δ positions, similarly to I. The origin of the migrating hydrogen atoms have been determined by deuterium labelling. Mechanistic suggestions are presented to explain the observed facts.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050107
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    A new mass spectrometric classification of alkylbenzenes (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 79-81 
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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 classification of alkylbenzenes is proposed based on the relative intensities of pairs of ions, of which one is formed from the other by loss of a hydrogen molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050110
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    Forthcoming events (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 103-104 
    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.1210050115
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    Hydrogen exchange in a six-membered ring transition state. Evidence for a stepwise McLafferty rearrangement (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 545-550 
    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 2-methyl-5-chloro-3-N-ethyl-benzothiazolium iodide and labeled counter-parts are discussed with particular emphasis on the loss of ethylene from the moiety produced by thermal elimination of HI from this salt. This process demonstrates the stepwise nature of a McLafferty rearrangement involving a hydrogen transfer to an olefinic carbon.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050506
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    Masthead (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971) 
    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.1270030101
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  • 41
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    Multiple NMR analysis of the affinin (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 1-5 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The configuration of the insecticidal and medicinal lipid ‘affinin,’ N-isobutyldeca-trans-2, cis-6, trans-8-trienamide, may be assigned in an unequivocal manner by NMR spectroscopy. The spectral data and the advantages of the multiple irradiation methods are presented and discussed.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030102
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  • 42
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    NMR spectra of Δ3- and Δ4-pyrrolin-2-one (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 7-22 
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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 spectra of Δ3- and Δ4-pyrrolin-2-one were analysed and the sign of all the coupling constants determined by tickling and triple resonance experiments. A positive allylic interaction (Jxz in 2) is reported and four-bond couplings are discussed in particular. Deuterium exchange affords evidence for the tautomeric equilibrium between 1 and 2.
    Additional Material: 8 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030103
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    Protonenresonanzuntersuchungen an Polysacchariden - III:II. Mitteilung siehe Lit. 1. Amylose-und dextranderivate (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 31-36 
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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 proton resonance spectra of some methyl-, acetyl-and benzoyl-derivatives of the polysaccharides amylose and dextrane as well as of α-D-glucose and β-maltose have been analysed. The configuration and conformation of the monomer units and the kind of glycosidic bonding may be determined from the relative signal positions and the coupling constants.
    Notes: Die Protonenresonanzspektren einiger Methyl-, Acetyl- und Benzoylderivate der Polysaccharide Amylose und Dextran sowie der α-D-Glucose und β-Maltose wurden analysiert. Aus den relativen Signallagen und den Kopplungskonstanten der Ringprotonen kann die Konfiguration und Konformation des Monomerbausteins sowie die Art der glycosidischen Bindung bestimmt werden.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030105
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    Natural abundance 13C NMR studies of perezone and derivativesPresented in part before the VIth International Symposium on the Chemistry of Natural Products of the IUPAC, México City, 21st to 25th April 1969. (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 23-29 
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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: Assignment of all 13C chemical shifts of perezone (1) and some derivatives was possible using time averaged 25·15 MHz spectra with the aid of proton noise modulated and CW decoupling. Rapid interconversion of tautomeric forms of 2,5-dihydroxy-1,4-benzoquinones is deduced from the 13C spectra.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030104
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    The NMR spectra of some 1,3-oxathians and the influence of heteroatoms on the coupling constants of adjacent protons (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 37-43 
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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 preparation of 4-phenyl-1, 3-oxathian, 6-methyl-1, 3-oxathian, and some of their 2-substituted derivatives is described. Significant features of their NMR spectra are discussed with particular reference to the influence of the heteroatoms on the coupling constants of adjacent protons.
    Additional Material: 3 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270030106
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    Isomérie Polyédrique dans des Spirophosphoranes Possédant le Groupement P—H (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 45-74 
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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: We have studied the temperature dependence of NMR spectra of six spirophosphoranes of the general formula: Experimental data show intramolecular isomerism which was explained by pseudo-rotation mechanism (Berry, Lit. 1).In all cases except one we also observed tautomerism between spirophosphorane and phosphite forms.
    Notes: Nous avons étudié la variation, en fonction de la température, des spectres de RMN de six spirophosphoranes des types: Les résultats expérimentaux indiquent l'existence d'une isomérie intramoléculaire que nous avons interprétée en adoptant le mécanisme de pseudo-rotation proposé par Berry.1Dans tous les cas, sauf un, le déplacement de l'équilibre tautomère spirophosphorane ⇌ phosphite s'ajoute an phénomène d'isomérie observé.
    Additional Material: 15 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030107
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    A systematic approach to the AA′BB′, AA′BB′MX and derived systems in nuclear magnetic resonance (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 83-99 
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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 AA′BB′ and AA′BB′MX nuclear magnetic resonance spin systems for I = ½ nuclei have been analysed. Expressions for the transition frequencies and intensities have been obtained which have the maximum accuracy consistent with practicable use. The analyses have been applied respectively to a hypothetical AA′BB′ nuclear spin system and to the two molecules para- fluoro-phenyldichlorophosphine and tris-para-fluorophenylphosphine. Inconsistencies in earlier treatments of the AA′BB′ system have been clarified.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030109
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    Etude des Signes des Constantes de Couplage 3J(P—X—C—H) et 4J(F—P—X—C—H) dans les Diaza-, Dioxa- et Dithiaphospholanes Fluores (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 75-82 
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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 NMR spectra of the trivalent fluorophospholanes (1, 2, 3) have been analysed at length. The absolute signs of the 3J(P—H) and 4J(F—H) coupling constants have been referred to the known negative sign of the 1J(P—F) coupling constant from selective heteronuclear double resonance experiments. The 3J(P—O—C—H) and 3J(P—N—C—H) coupling are positive. The weak values observed for 3J(P—S—C—H) have opposite signs, the larger being positive. All the 4J(F—P—X—C—H) coupling constants are positive showing a lack of stereospecificity.
    Notes: On a réalisé l'analyse complète des spectres de RMN des fluorophospholanes (1 à 3). Les signes absolus des constantes de couplage 3J(P—H) et 4J(F—H) ont été déterminés, par rapport au signe absolu connu de la constante 1J(P—F), à partir d'expériences de double résonance hétéronucléaire sélective. Les constantes 3J(P—O—C—H) et 3J(P—N—C—H) observées sont toutes positives. Les deux constantes 3J(P—S—C—H) du dithiaphospholane (2) présentent des faibles valeurs de signes opposés, la plus grande étant positive. Toutes les constantes 4J(F—P—X—C—H) sont positives et ces constantes semblent peu stéréospécifiques.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030108
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    Charge density and NMR parameters. Aliphatic derivatives (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 113-125 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The charge distribution in several substituted aliphatic derivatives was determined by a parametric MOLCAO method. The charges were successfully employed to interpret NMR parameters, namely proton and carbon chemical shift and vicinal proton-proton coupling constants in ethyl derivatives and carbon-proton coupling constants.The linear correlations found between NMR parameters and charge densities are restricted to substituents of the same row of the periodic system. The decay along the aliphatic chain of the perturbation induced by substituents on proton chemical shift is also reproduced by charge distribution. Some results also seem to indicate that the substituents affect the hybridization of the attached carbon atom.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030111
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  • 50
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    Tritium nuclear magnetic resonance spectroscopy - I: Technique, internal referencing and some preliminary results (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 127-138 
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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: Routine measurement of triton magnetic resonance spectra is described for the first time, using a micro-bulb sample tube assembly to obviate radiological hazards. Levels of isotope abundance and chemical concentration, the problem of self-radiolysis and the general usefulness of the technique are discussed. Results are given for a selection of compounds including glucose, amino-acids, thymidine and uridine. The self-radiolysis of the last is followed.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030112
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    Nuclear magnetic resonance spectroscopy. Analysis of the 1H and 13C spectra of Br13CH213CH2BrSupported by the National Science Foundation.Contribution No. 4132. (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 139-141 
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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 1H and 13C NMR spectra of 1,2-dibromoethane-13C2 have been analyzed to determine the magnitude (38·9 Hz) and sign (positive) of 1J(C—C) relative to those of 3J(H—H) (positive). This type of coupling appears to be rather insensitive to the presence of bromine or methyl as substituents on the carbons.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270030113
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    Nuclear magnetic resonance discussion group - A subject group of the chemical society (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 144-145 
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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.1270030115
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    Structures, mécanismes et spectroscopie - 120 problèmes, 60 solutions (Cours et Documents de Chimie - Volume 2), by J. C. Maire and B. Waegell. Gordon and Breach, Paris. 300 pp. £8.00 $19.20 (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 143-143 
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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.1270030114
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    Forthcoming meetings (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 146-146 
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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.1270030116
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    News and events (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. i 
    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.1270030117
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    Masthead (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971) 
    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.1270030201
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  • 57
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    Studies of the substituent effect in aromatic systems by 35 Cl-NQR. Chloroacetanilides ClxC6H5-x NHCOCH3-y Cly (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 147-176 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 35Cl-NQR spectra of 45 chlorosubsitituted acetanilides, ClxC6H5-xNHCOCH3-yCly, were investigated and the temperature dependence of some spectra, especially of monochloroacetic acid derivatives, was measured. A preliminary assignment of the NQR frequencies is given. A correlation between NQR frequencies and substituent parameters permits the study of the substituent effect of the acetamido group, —NHCOCH3-yCly. The chloro-substitution in the side chain of the acetanilides seems to have no noticeable influence on the 35Cl-NQR frequencies of the chlorine atoms at the benzene ring. The NQR frequencies of the chlorine atoms in the chloroacetamido group are, on the other hand, insensitive to substitutions at the benzene nucleus. The possibility of steric influences on the NQR spectrum of ortho-chloro-substituted acetanilides is discussed. The investigation further confirms that a crystal field effect of about ±500 kHz must be considered in the interpretation of NQR spectra of chlorobenzene derivatives.
    Additional Material: 10 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030202
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    Barrières de Rotation Autour des Liaisons C—N dans la Série des Urées. Influence du Remplacement de C=O par C=S (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 187-191 
    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: NMR spectroscopy has been used to investigate the barrier of rotation about the carbonnitrogen bond in ureas and thioureas. NMR and activation parameters are determined and compared.
    Notes: Une barrière de rotation de faible valeur autour de la liaison N—CO est mise en évidence dans les urées de formule CH3—NH—CO—NHR (R = H, CH3). Les thiourées correspondantes sont examinées afin d'étendre l'étude comparative des systèmes carbonyle-thiocarbonyle. Les paramètres RMN et les grandeurs thermodynamiques liées au processus d'isomérisation sont discutés.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030204
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    Long-range proton-proton interactions through epoxidesThis paper is Part IV of the series ‘Analysis by Nuclear Magnetic Resonance’. For Part III, see ref. 1. (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 193-200 
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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: Double and triple nuclear magnetic resonance experiments performed at 100 MHz demonstrate the existence of long range 1H - 1H couplings through epoxides. In a series of epoxycontaining sesquiterpenoids, interactions between protons separated by up to six sigma bonds were detected. These interactions may have origins similar to the well-known allylic and homoallylic couplings found in carbon-carbon double bonded compounds, although they are much smaller in the epoxy systems. We propose to name them as ‘epoallylic’ and ‘epohomoallylic’ interactions. Some couplings are observed directly, whereas in other cases only an improvement in resolution is seen during multiple irradiation experiments. Even in these latter cases the areas of the observed peak do not change upon multiple irradiation which demonstrates the absence of nuclear Overhauser effects. The stereochemistry of some asymmetric centers of the compounds studied is deduced from the spectra.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030205
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    Solvent effects in nuclear magnetic resonance spectra of some pyrazines, pyrimidines and their N-oxides (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 217-220 
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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 benzene-induced solvent effects upon the proton chemical shifts of various pyrazines, pyrimidines and their N-oxides are described. Larger chemical shift effects, implying closer benzeneheterocycle association, are noted in the N-oxides as compared to the non-oxidized heterocycles.The solvent-induced chemical shift changes can be used to establish the site of N-oxidation in those instances where different isomers can be formed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030207
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    The NMR-spectrum of benzaldehyde partially oriented in the nematic phase (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 243-248 
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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 NMR spectrum of benzaldehyde oriented in the nematic phase of a mixture of p-(p-ethoxyphenylazo)phenylheptanoate and p-(p-ethoxyphenylazo)phenylundecylenate is analysed. It is demonstrated that the data are inconsistent with models in which the aldehyde group freely rotates or has minimum energy when it is perpendicular to the ring plane. The barrier height to rotation, however, cannot be obtained, nor is it possible to discriminate between the two possible solutions in which the averaging planar forms do or do not reorient in the liquid crystal between successive internal rotations.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030209
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    PMR studies on the cyclitol mytilitol (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 255-257 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The PMR spectra of mytilitol at 60, 100 and 220 MHz are presented; the latter confirms the structure 1.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030211
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    A PMR study of hydration products in aqueous acetaldehyde solutions (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 259-261 
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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: By analysing the PMR signal CHhyd in hydrated acetaldehyde molecules, the various hydration products in water-acetaldehyde solutions were detected and studied.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030212
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    Masthead (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971) 
    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.1270030301
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    An abnormal trend in J(13C—CH) values in some aldehydes (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 279-281 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 2J(13C—CH) couplings involving the formyl proton of α-halogeno-aldehydes have been found to decrease with increasing halogen electronegativity. This trend may be rationalised in terms of inductive withdrawal and a conformation dependent hyperconjugative effect. The direct J(13CH) couplings are also anomalous.
    Additional Material: 1 Tab.
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    An interpretation of 1H and 13C chemical shifts in substituted benzenes on the basis of M.O. charge densities (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 283-291 
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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 results of an MOLCAO calculation on both σ and π electron systems of several substituted benzenes are reported. The charge densities obtained reproduce the dipole moments of the molecules examined, provided that substituents with strong mesomeric effects are not present. It is shown that there is a satisfactory agreement between 13C and 1H chemical shifts and the trend of total charge densities for all positions of substituted benzenes.
    Additional Material: 1 Ill.
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    Solvent effects in NMR spectra induced by benzene in methyl benzoic esters - IV (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 299-303 
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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: NMR solvent effects induced by benzene in methyl substituted benzoic esters can be effectively used in the interpretation of complex NMR spectra. A 1:1 collision complex between solvent and solute is proposed, supported by dilution curve experiments and the geometry of the ‘complex’ is discussed.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030306
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    The molecular structure and unusual orientation of phenol in a liquid crystal solevent as determined by NMR spectroscopy (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 791-795 
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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 NMR spectrum of phenol, dissolved in a nematic solvent, is explainable in terms of two averaging planar structures for each of which the principle axis of orientation in the ring is on the opposite side of the oxygen atom from the hydroxyl proton. External hydrogen bonding to the solvent seems to be an important factor in determining the orientation. The molecular structure obtained is compared with those found by microwave spectroscopy and X-ray diffraction.
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    URL: http://dx.doi.org/10.1002/mrc.1270030618
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    International symposium on nuclear quadrupole resonance spectroscopy (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 801-801 
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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.1270030620
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    Chemical polarization of nuclei. Proton polarization during thermal decomposition reaction of dimethyl perdiglutarate (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 797-799 
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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 chemical polarization was observed in methyl butyrate, γ-butyrolactone and in some other products of the dimethyl perdiglutarate decomposition reaction. The polarization pattern of the α-CH2 and β-CH2 groups in butyrolactone is just as one would expect in the products of the CH3OCH2CH2ĊH2 radical which has left the pair of identical radicals. Thus butyrolactone is formed from the CH3OCH2CH2ĊH2 radical by means of intramolecular cyclization and elimination of the methyl radical.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030619
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    Spectrum 0284-0300 (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 1-23 
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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.1270030702
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    Conformation of substituted five-membered rings (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 479-483 
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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 magnetic resonance chemical shifts and coupling constants for some 5-substituted dihydrofurans, dihydrofuran and dihydrothiophene fused rings are reported, the substituents being methyl, ethyl and phenyl.The observed coupling constants are consistent with buckled rings, in which it appears that a conformation with pseudo-equatorial substituents is predominant.
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    URL: http://dx.doi.org/10.1002/mrc.1270030411
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    Chemical shift non-equivalence and optical activity in tricarbonyl(ARENE)chromium compounds (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 503-504 
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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 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270030414
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    News and events (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. i 
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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.1270030415
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    Use of liquid crystal solvents for obtaining isotropic scalar nuclear spin-spin coupling constants (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 495-501 
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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: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030413
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    A two frequency method for the interpretation of multiple NQR spectra (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 505-507 
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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 new method for the interpretation of NQR spectra is described. The indentification of multiple lines belonging to different transitions \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{1}{2} \to \frac{3}{2}{\rm and}\frac{3}{2} \to \frac{5}{2} $\end{document}is carried out by using the ‘seizure’ of the corresponding low or high frequency transitions in a two-frequency pulse experiment.
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    URL: http://dx.doi.org/10.1002/mrc.1270030502
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    Wannier spin excitons in charge-transfer complexes (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 509-513 
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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: Electron spin resonance in some charge-transfer complexes of 7,7,8,8-tetracyanoquinodimethane (TCNQ) with sulphanilamides and antibiotics has been investigated.The ESR spectra are caused by two types of paramagnetic centres: the impurity type and the thermally excited type (Wannier spin excitons).
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    URL: http://dx.doi.org/10.1002/mrc.1270030503
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    Temperature dependence of the NQR frequencies and relaxation times in Menshutkin's complexes on the basis of arsenic trichloride and tribromide (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 515-526 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The temperature dependence of NQR frequencies and spin-lattice relaxation times in Menshutkin's complexes, prepared on the basis of AsCl3 and AsBr3 have been investigated.The rotational oscillation frequencies νt and the average life times τa of rotational oscillation quanta have been calculated by both the Bayer and Woessner-Gutowsky theories.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030504
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  • 79
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    Proton magnetic resonance spectra of thenyl derivatives - IIFor Part I, see Ref. 1.. Chloromethylthiophenes and some dithienylmethanes (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 527-531 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: PMR spectra of thirty-eight chloromethylthiophene and seven dithienylmethane derivatives were observed at 60 or 40 MHz. The chemical shifts of methylene protons were 4·63 to 5·25 ppm for monosubstituted 2-chloromethylthiophenes and 4·37 to 4·56 ppm for monosubstituted 3-chloromethylthiophenes, respectively, with reference to TMS. Those for 2,2′ -dithienylmethanes, which have one substituent in each ring, were 4·12 to 4·34 ppm. These shifs are useful for determination of the positions of the methylene groups in the related compounds. The long-range coupling constants observed for methylene proton signals are also useful for the determination of the positions of substituents.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030505
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  • 80
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    Tris(dipivaloylmethanato)europium induced shifts of proton resonances in π-deficient nitrogen heterocycles (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 575-582 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tris(dipivaloylmethanato)europium [Eu(DPM)3]induced shifts of the proton resonances of pyridine and its 2-methyl, 3-methyl, 2,3-dimethyl and 2,5-dimethyl derivatives, pyridazine, pyrimidine, pyrazine, quinoline, isoquinoline, 1,6-, 1,7- and 1,8-naphthyridine, cinnoline, phthalazine, quinazoline, quinoxaline, 1,4,5- and 1,4,6-triazanaphthalene, pteridine, acridine, phenanthridine and 1, 10-phenanthroline, have been measured for solutions containing 0·1, 0·3 and 0·5 molar equivalents of Eu(DPM)3. Differences in the behaviour of these heterocycles are discussed in terms of the steric relationship between the heterocycle and the complex. The 3 cos2 φ term, present in the expression for calculating pseudo-contact shifts, is shown to be important. The order of basicity of these heterocycles, as measured by their pKa values, cannot be used to predict the order of Eu(DPM)3 induced chemical shifts.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030512
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  • 81
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    Nuclear magnetic resonance studies of methyl-5, 6-dicarboxy-2-norbornene derivatives (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 557-565 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple procedure is provided for the quantitative analysis of Diels-Alder adduct prepared from commercial methylcyclopentadiene and maleic anhydride by NMR spectra without further separation of its components. The adduct is considered as a mixture of endo norbornene derivatives (Cn), (Dn), (E) and (Fn) which are obtained from 1-, 2- and 5-methylcyclopentadiene and cyclopentadiene, respectively.The quantitative analysis of the adduct can be made on a basis of the ratio of the signal intensities of the olefinic protons in the adduct. The result shows that the adduct prepared under mild conditions mainly consists of three norbornene derivatives (Cn), (Dn) and (Fn), with a negligibly small amount of (E). When the adduct prepared under mild conditions is heated, it contains the exo isomers (Cx), (Dx) and (Fx). The ratio of the endo and the exo norbornene derivatives, i.e. ((Cn) + (Dn) + (Fn)):((Cx) + (Dx) + (Fx)), may be estimated from the signal intensities of the 5- and 6-protons.As the result of the analyses of the adducts which are obtained by heating at different temperatures the adduct prepared under mild conditions, the mole fraction of 2-methyl isomers (Dn) and (Dx), which is found to be 58 % in the adduct prepared at - 15°C, keeps on increasing with rising temperature and shows almost the same value, ∼86%, when heated above 150°C. Therefore, the equilibrium between 1-methyl and 2-methyl isomers does not change above 150°C. On the other hand, the isomerization from endo to exo isomers is not found below 110°C, and then exo isomers keep on increasing above 140°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030510
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  • 82
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    Proton magnetic resonance spectrum of thiophen dissolved in a nematic solvent (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 583-587 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The PMR spectrum of thiophen dissolved in a nematic phase is reported. This spectrum has been analysed iteratively. The ratios of the various inter-proton distances determined in this study are in good agreement with those previously reported.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030513
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  • 83
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    14N chemical shifts in the enamino ketone quaternary ammonium salts (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 589-594 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 14N chemical shifts were measured for a series of quaternary ammonium salts of enamino ketones. An upfield shift of the 14N resonance signals upon quaternization has been observed. The interpretation in terms of the approximate theory of nuclear magnetic shielding is given. The calculations for some model systems result in a general agreement with the experimental data.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030514
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  • 84
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    Pentafluorobutane; an example of long-range five bond H—F coupling (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 599-604 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complete analysis of the spectrum of 2,2,4,4,4-pentafluoro-n-butane is reported. From the sum of the vicinal proton-fluorine coupling constants an estimate of the conformational energy has been obtained and successively the long-range coupling of the individual conformers has been calculated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030516
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  • 85
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    Etudes RMN en Serie Heterocyclique - VIII:Mémoire précédent de cette série: J. Elguero, A. Fruchier et R. Jacquier J. Chim. Phys. 68, 1113 (1971). Effet des Dipivalomethanates de Nickel(II), Cobalt(II), Europium(III) et Praseodyme(III) sur les Deplacements Chimiques de quelques Derives du Pyrazoles (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 595-598 
    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 effects produced by four shift reagents on the proton magnetic resonance spectra of 1-methylimidazole and seven pyrazole derivatives have been determined. These results are discussed in the light of their usefulness in differentiating between structural isomers.
    Notes: On a déterminé l'effet produit par quatre réactifs de déplacement sur les signaux de sept derivés du pyrazole et sur ceux du methyl- 1 imidazole. Ces effets sont discutés en fonction de leur utilité pour différencier des structures isomères.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270030515
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  • 86
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    Spectroscopic studies on N,N-dimethylamides - IIIPart II, ref. 1. Amide-rotational barriers of N,N-dimethylbenzamides and -cinnamamides. A comparison of the NMR intensity ratio- and iterative total line shape methodPart of the thesis of K. Spaargaren, Amsterdam 1970. (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 605-614 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Amide-rotational barriers of a series of para-substituted N,N-dimethylbenzamides and -cinnamamides have been obtained by both the intensity ratio method, according to Rogers and Woodbrey,2 and an iterative total line shape analysis.From a comparison of the results, it is concluded that a discussion of rotational barriers obtained with the intensity ratio method should preferably be based on ΔGTC
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/mrc.1270030517
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  • 87
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    Forthcoming Meetings (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 635-635 
    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.1270030520
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  • 88
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    Solvent effects on internal rotation about the B—N bond in aminoboranes as studied by proton magnetic resonance spectroscopy (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 627-633 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton magnetic resonance spectra of two series of aminoboranes, Me2N BRPh (R = Cl, Me, Et, i-Pr, i-Bu, t-Bu and C≡CMe) and PhRN BMe2 (R = Me, Et and i-Pr), have been examined in various solvents to show that the potential barrier to internal rotation about their B—N bond is lowered in some electron-pair donor solvents. The barrier in an aminoborane decreases with increasing electron-donating power of the solvent. The barrier in alkylaminoboranes in an electronpair donor solvent was found to increase with increasing size of the substituent alkyl group, owing to the steric repulsion between the alkyl and the solvent molecule. The solvent effects of benzene resulted in downfield shifts of the proton signals due to B-substituents and in upfield shifts of the signals due to N-substituents, as expected. The formation of a 1:1 adduct of Me2N BPh(t-Bu) with carbon disulphide was found.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/mrc.1270030519
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  • 89
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    Masthead (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971) 
    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.1270030601
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  • 90
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    Conformational analysis of 1,2:5,6-diepithio-3,4-di-o-acetyl-hexitols (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 647-654 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformational studies of acetylated open chain hexitol derivatives, possessing similar structures but differing in their configuration have been made by analysing their NMR spectra. It is shown, that the carbon chain of all three (manno-, ido-and gluco-) isomers is present in a non planar non zig-zag conformation, containing the acetoxy groups at C-3 and C-4 in a trans relation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030603
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  • 91
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    Chemical ionization mass spectrometry of complex molecules - VI:For Part V see Ref. 1. Peptides (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 19-31 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical ionization mass spectra of a series of simple peptides containing six or fewer amino acids have been studied. Using methane as the reactant gas we found cleavage of the peptide bond occurs in two ways, yielding either the acyl carbonium ion or the complementary ammonium ion. The observation of both types of fragments permits the determination of the amino acid sequence of the peptide. The ammonium ions provide an additional sequence determining route compared to that available from electron-impact spectra. ‘Sequence-determing ions,’ especially the quasimolecular ion at m/e [M+1] are usually more intense than in the electron-impact mass spectra.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050104
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  • 92
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    The mass spectra of N-acyliminopyridinium and isoquinolinium betaines (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 61-71 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentation behaviour of N-acyliminopyridinium and isoquinolinium betaines has been investigated. Major fragmentations of the pyridinium betaines can be rationalized in terms of charge localization on the pyridinium nitrogen. The most prominent process is α-cleavage followed by loss of NCO to furnish a pyridine ion. The electron-impact induced fragmentation of N-benzoyliminopyridinium betaine (I) was compared with that of thermolysis. The completely analogous behaviour has been observed in the corresponding isoquinolinium betaines.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050108
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  • 93
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    Mass spectrometry of onium compounds - IV:For Part III, see ref. 1. Diazonium salts (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 73-77 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The zwitterions of diazotized ortho and para aminophenol are very volatile and give strong peaks in the mass spectra corresponding to the molecular ion. The m-isomer, which cannot be stabilized through a simple quinonoid structure, gives rise to a complex spectrum through decomposition and coupling reactions. The zwitterions of diazotized anthranilic and sulphanilic acids did not give the molecular ion peak.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050109
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  • 94
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    Fluorinated carbohydrates - IXFor Part VIII, see Ref. 1. The mass spectra of deoxyfluorohexopyranose derivatives (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 437-445 
    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 some deoxyfluorohexopyranose acetates bearing the fluorine substituent at positions 2,3,4, or 6 were determind. The fragmentation pathways were analogous with those for hexopyranose acetates, except that the cleavage of bonds between carbon atoms was hindered by the attachment of a fluorine substituent to one of the carbon atoms.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050409
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    Application of mass spectrometry to oligosaccharide sequencing (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 481-482 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A recent publication by Johnson et al1. Prompted us to record our earlier findings from mass spectral studies of oligosaccharide (see ref.2). This investigation has shown the possibility of oligosaccharide sequencing by means of the mass spectra of their phenylozotriazoles and N-arylglycosylamines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050414
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    2-(1-Azulyl)ethyl tosylate methylene scrambling in the gas phase. Similarities to solution chemistryPaper III in the series Nonbenzenoid Aromatic Systems; for paper II see ref. 1. (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 785-788 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The methylene groups in 2-(1-azulyl)ethyl tosylate are largely scrambled prior to formation of fragment ions in the mass spectrometer. This process also occurs in the 3-nitro analog, where it is dependent on sample residence time in the source and independent of electron energy. It could not be observed with the isomeric 6-substituted tosylates, the 1-substituted acetates or alcohols, or with 2-(p-anisyl)ethyl tosylate. Scrambling occurs in the neutral molecule prior to ionization and a mechanism involving absorption onto the metal surface and formation of a complexed ethylenazulonium ion is suggested.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050704
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    Massenspektrometrie und ihre anwendun auf strukturelle und stereochemische Probleme - CCVI:Teli CCV, G. G. Smith und C. Djerassi, Org. Mass Spectrom. 5, 487 (1971). Beobachtungen bei der Fragmentierung Olefinischer Kohlenwasserstoffe (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 817-831 
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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 molecular ions generated by electron-impact from olefins of the general structure I, II and III fragment mainly via the McLafferty rearrangement. Even under mild ionization conditions, however, they undergo isomerization before fragmentation takes place.The origin and mode of formation of an ion generated simultaneously by decay of the molecular ion and the McLafferty ion were investigated by means of 13C- and D-labelling.The influence of branching at the γ-, ω-, or ∊-positions of the double bond in type I-olefins was studied.
    Notes: Bei Olefinen der allgemeinen Struktur I, II und III erleidet das unter Elektronenbeschuss erzeugte Molekülion neben der als Hauptreaktion ablaufenden McLafferty-Umlagerung auch bei milden Anregungsbedingungen eine vor der Fragmentierung eintretende Isomerisierung.Es wurde versucht, Herkunft und Entstehungsweg eines sowohl beim Abbau des Molekülions als auch des McLafferty-Ions gebildeten gemeinsamen Bruchstückes mit Hilfe von 13C- und D-Markierung zu klären.Der Einfluss einer Verzweigungstelle in γ-, ω- oder ∊-Position zur Doppelbindung bei Olefinen vom Typ I auf deren Verhalten im Massenspektrometer wurde untersucht.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050707
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    Potentiel d'ionisation, courbes d'efficacite d'ionisation differentielle, localisation de la charge de 9 cyclopropanes (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 845-850 
    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: Ionization potentials and fine structure in ionization efficiency curves have been determined for nine cyano-1 diphenyl-1,2 cyclopropanes. It is shown that derivatives which include dimethylamino group have the lowest ionization potential, the first break of the fine structure and Hammett constants. For compounds containing the nitro substituent we have a constant value of the first break after the ionization potential, which shows the primary role of the nitro group in the excited state of the molecular ions.
    Notes: Rües potentiels d'ionisation, les courbes d'efficacité d'ionisation différentielle ont été déterminées par la méthode EDDEDD: Energy Difference Distribution (voir R. E. Winters).6 pour 9 cyano-1 diphényl-l,2 cyclopropanes. II est montrk que les composés comprenant le groupement diméthylamino possedent les potentiels d'ionisation les plus bas. Pour ces cornposés, on peut établir une corrélation qualitative entre le potentiel d'ionisation, la première cassure dans la courbe d'efficacité d'ionisation différentielle et la constante de Hammett. Pour les composés comprenant le groupement nitro, la valeur constante de la première cassure au dessus du potentiel d'ionisation nous permet de penser que ce substituant a un rǒe primordial dans l'état excité des ions moléculaires.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/oms.1210050710
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  • 99
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    Pyrolysis of some perfluoroalkylene-linked aromatic imides (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 851-855 
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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 pyrolysis of perfluoroalkylene-linked polyimides in an inert atmosphere has been studied using a pyrolysis-gas chromatographic-mass spectrometric method. The major primary gaseous degradation products were carbon monoxide and carbon dioxide. In addition large amounts of silicon tetrafluoride were produced by secondary reactions.Results obtained with 1,3-di-(3-phthalimidophenyl)hexafluo0ropropane and bis[N-phenyl-1,3-dioxo-isoindolyl(5,5′)]hexafluoropropane suggest that the perfluoroalkylene groups have a greater influence on the electron-impact induced fragmentation of the imide ring than on its thermal breakdown.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050711
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  • 100
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    Collection de fragments organiques a l'aide d'un separateur d'isotopes (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 891-892 
    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: An isotope seperator has been modified so that work can be carried out on organic compounds. Analysis of the collector by mass spectrometry showed a weighable deposit of organic fragments.
    Notes: Après modification, nous avons pu déposer une quantité pondérable de matière organique sur le collecteur d'un séparateur d'isotopes.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050716
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