Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1985-1989
  • 1980-1984  (22)
  • 1975-1979
  • 1930-1934
  • 1890-1899
  • 1981  (22)
  • Organic Chemistry  (10)
  • Inorganic Chemistry  (7)
  • Polymer and Materials Science  (3)
  • Cell & Developmental Biology  (2)
  • Engineering General
  • crystal structure
Material
Years
  • 1985-1989
  • 1980-1984  (22)
  • 1975-1979
  • 1930-1934
  • 1890-1899
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 1058-1062 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rates of proton transfer from 2, 4-hexadiene, 1, 3-cycloheptadiene, cyclopentadiene and acetone to t-butoxide have been measured in the gas phase using pulsed-ion-cyclotron-resonance spectroscopy. The rate constants are (units of 10-10 cm3 molecule-1 s-1): 2.7 ± 0.4, 3.8 ± 0.4, 6.1 ± 0.7 and 10.8 ± 1.5, respectively. These results are analyzed in terms of the properties of the encounter complex and reaction transition states. The reaction profile for t-butoxide + cyclopentadiene is modeled using RRKM theory and an estimate for the central barrier height is obtained.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3634-3642 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Au55[P(C6H5)3]12Cl6- a Gold Cluster of an Exceptional sizeThe reduction of (C6H5)3PAuCl with B2H6 in benzene yields Au9,2[P(C6H5)3]2Cl which is characterized by means of molecular weight determinations as Au55[P(C6H5)3]12Cl6. A simple model, based on an arrangement of close-packed gold atoms, leads to a gold cluster the structure of which is in good agreement with the unusual chemical composition. The Mößbauer spectrum of the compound shows four different kinds of gold atoms: a metallic part (Au13-nucleus), Au atoms coordinated by P(C6H5)3 and Cl ligands, resp., as well as uncoordinated surface gold. The complex can be decomposed by bromine and iodine to (C6H5)3PAuCl, (C6H5)3PAuBr(I), and metallic gold. The thermolysis at 50°C leads to [(C6H5)3P]2AuCl and gold quantitatively.
    Notes: Die Reduktion von C6H5)3PAuCl mit B2H6 in Benzol ergibt Au9,2[P(C6H5)3]2Cl, das mittels Molmassebestimmungen als Au55[P(C6H5)3]12Cl6 charakterisiert wurde. Ein einfaches Modell, beruhend auf einer Anordnung dichtest gepackter Goldatome, führt zu einem Goldcluster, dessen Aufbau mit der ungewöhnlichen chemischen Zusammensetzung in guter Übereinstimmung ist. Das Mößbauer-Spektrum der Verbindung zeigt vier Sorten von Goldatomen: einen metallischen Anteil (Au13-Kern), durch P(C6H5)3-bzw. Cl-Liganden Koordinierte Au-Atome, sowie unkoordi-niertes Oberflächengold. Mit Brom und lod läß sich der Komplex zu (C6H5)3PAuCl, (C6H5)3 PAuBr(I) und metallischem Gold abbauen. Die Thermolyse bei 50°C führt quantitativ zu [(C6H5)3P]2AuCl und Gold.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Biologically Important Carbohydrates, 251) On the Regioselectivity of Sharpless Reaction; The vic. cis-Oxyamination of Unbranched and 3-C-Branched Ald-2-and Ald-3-enopyranosidesThe configurations and the ratios of regioisomeric amino sugars obtained by vic. cis-oxyamination of unsaturated carbohydrates 1, 4, 9, 16, 19, 21 are determined. Due to the ratios of amino sugars from the ald-3-enopyranosides 9 and 16 it is obvious that the regioorientation is probably not directed by the electron density at the double bonds.
    Notes: Die Konfigurationen und die Verhältnisse regioisomerer Aminozucker bei der vic. cis-Oxyaminierung von ungesättigten Kohlenhydraten 1,4,9,16,19,21 werden bestimmt. Die Isomerenverhältnisse der Aminozucker aus den Ald-3-enopyranosiden 9 und 16 zeigen, daß die Regioorientierung wahrscheinlich nicht durch die Elektronendichte an den Doppelbindungen gesteuert wird.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0009-286X
    Keywords: Anemometrie ; Leitfähigkeitssonden ; Zweiphasenströmung ; Bioreaktor ; Turbulenz ; Blasensäule ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The gas phase reaction of 1,2,4,5-tetracyanobenzene (3) with metal sheets like Cu, Ni, Co, Fe, and Ti exhibits the in situ formation of polymeric phthalocyanine coatings 1. The electrochemical behaviour of layers of 1 is investigated by means of cyclic voltametric measurements. Determination of layer-thickness and electrical resistance is also performed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Microbial Reduction of 2,2-Disubstituted Cyclopentan-1,3-diones. Synthesis of Chiral Cyclopentane Derivatives Useful as Intermediates for 8-Methyl ProstaglandinsThe microbial reduction of the 2,2-disubstituted cyclopentan-1,3-diones 3a—c giving rise to the chiral compounds 2, 4b and 4c is described.The incubation products can be used as intermediates for 8-methyl prostaglandins.The structures of the fermentatively formed compounds, including their chirality and optical purity have been established by comparison with authentic specimen (cp. 2) or by chemical and spectroscopic methods (cp. 4b, 4c) respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 170 (1981), S. 113-131 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The morphology of the foregut muscles of five spider families (Theraphosidae, Agelenidae, Araneidae, Lycosidae, Salticidae) was described, and the individual fibre numbers and fibre cross diameters of the muscles were determined. The nomenclature of these muscles was reviewed and modified if necessary.Oxidative enzyme and myosin-ATPase histochemistry revealed eight dilatatory muscles of the foregut to consist of slow (type I) fibres, while fast fibres (type IIB), and intermediate fibres, were only to be found in the two other muscles of the foregut, and in the remaining prosomal muscles (type IIA fibres around the poison gland).The eight sucking muscles proper of the foregut also showed stronger activities of transmitter metabolizing enzymes [monoamine oxidase, glutamate dehydrogenase(NAD)], and comparatively distinct amounts of glycogen and lipids.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 201 (1981), S. 141-156 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Destructive lesions were made in the right olfactory bulb of 16 adult opossums. Following postoperative survival periods of 4 to 31 days, the animals were sacrificed and perfused with 10% Formalin. Frozen sections of the brain were cut in either the coronal, horizontal, or sagittal plane and processed by the Fink-Heimer II method. Degenerating axons of olfactory bulb neurons were traced caudally in the ipsilateral lateral olfactory tract (LOT). Small lesions revealed a topographic representation of the olfactory bulb within the LOT. The dorsal, lateral, and ventral parts of the bulb were, respectively, represented in the dorsal, intermediate, and ventral parts of the LOT. Terminal degeneration was observed in the superficial half of the molecular layer ipsilaterally in the following structures: anterior olfactory nucleus, anterior hippocampal rudiment, olfactory tubercle, piriform cortex, ventrolateral frontal neocortex, lateral entorhinal cortex, nucleus of the LOT, and the lateral aspect of the cortical amygdaloid nucleus. No degeneration was observed in the anterior limb of the anterior commissure. Dorsal and lateral parts of the olfactory bulb projected to the anterolateral aspect of the olfactory tubercle, whereas the ventral part projected heavily to the entire tubercle. There was no evidence of topographic projections to other olfactory structures. The observations of the present investigation indicated that the olfactory bulb projections in the opossum, a primitive mammal, are essentially comparable with those of placental mammals.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1545-1549 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Malonodiamidines, III.  -  Synthesis and Condensation Reactions of 1,2,3,4,6,7-Hexahydro-7 imino-1,4-dimethyl-5H -1,4-diazepin-5-oneDiethyl malonodiimidate dihydrochloride (I) and N-methylethylenediamine yield in ethanol the N,N'-bridged malonodiamidine salt 2b, whereas 1 and N,N'-dimethylethylenediamine fail to give the 2b analogous salt 4. Instead the 1 H-1,4-diazepine-5,7-diimine hydrochloride 5 is obtained in low yield. Under hydrolytic reaction conditions the hydrochloride of the title compound is obtained in 56% yield. [3 + 3]-Condensations of the corresponding base 7 with 2,4-pentanedione and α,β-unsaturated carbonyl compounds lead to the diazepines 8, 9, and 10. 1 H-[1,4]diazepino-[5,6-b]quinolines 12a- f are obtained by condensation of 6 with the isatines 11.
    Notes: Malondiimidsäure-diethylester-dihydrochlorid (1) liefert mit N-Methylethylendiamin in Ethanol das N,N'-verbrückte Malondiamidiniumsalz 2b. Umsetzung von 1 mit N,N'-Dimethylethylendiamin führt wider Erwarten nicht zum 2b analogen Salz 4, sondern in geringer Ausbeute zum 1 H-1,4-Diazepin-5,7-diiminsalz 5. Unter hydrolytischen Reaktionsbedingungen wird das Hydrochlorid der Titelverbindung mit 56% Ausbeute erhalten. Die zugrundeliegende Base 7 geht mit 2,4-Pentandion und α,β-ungesättigten Carbonylverbindungen [3 + 3]-Kondensationen zu den Diazepinen 8, 9 und 10 ein. Die Isatine 11 kondensieren mit 7 zu den 1 H-[1,4]Diazepino[5,6-b]-chinolinen 12a- f.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Di- and Polyamino Sugars, XXVI.  -  Syntheses of Derivatives of 3,6-Diamino-3,6-dideoxy-D-galactose, 3,4,6-Triamino-3,4,6-trideoxy-D-galactose and 3,4,6-Triamino-3,4,6-trideoxy-D-glucoseThe syntheses of the title compounds were accomplished by single or twofold inversion of the configuration at C-4 of 3,6-diazido-3,6-dideoxy-1,2-O-isopropylidene-α-D-glucopyranose (6).  -  The oxidation of 6 to the ketone 18 and subsequent reduction with sodium tetrahydroborate were examined. 18 was easily transformed into the C-3 epimeric ribo-ulose 19. 18 and 19 yielded the enol acetate 20. The reduction of 18 afforded an epimeric mixture of 6 (gluco) and 11 (galacto) while 19 and 20 were stereoselectively reduced to form the allo isomer 22.
    Notes: Die Synthese der Titelverbindungen erfolgte über die 3,6-Diazido-3,6-didesoxy-1,2-O-isopropyliden-α-D-glucopyranose (6) durch einfache oder doppelte Inversion der Konfiguration an C-4.  -  Die Oxidation von 6 zum Keton 18 und die anschließende Reduktion mit Natrium-tetrahydroborat wurden untersucht. 18 epimerisierte an C-3 zur ribo-Ulose 19. Beide Ulosen 18 und 19 wurden in das Enolacetat 20 übergeführt. Die Reduktion von 18 ergab ein Epimerengemisch bestehend aus 6 (gluco) und 11 (galacto), während 19 und 20 stereoselektiv unter Bildung von 22 (allo) reduziert wurden.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...