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  • Chemistry  (6)
  • 1975-1979  (6)
Collection
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 1031-1037 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Separation and Identification of the Isomers of Di-1,2-propyleneglycolThe structural isomers of di-1,2-propyleneglycol are separated by means of gaschromatography. The structural and stereoisomeric forms are distinguished and identified by n.m.r. spectroscopy (1H and 13C) and mass-spectrometry.
    Notes: Die vom Dipropylenglykol-(1,2) möglichen strukturisomeren Formen werden gaschromatographisch getrennt. Die Strukturisomere und Diastereomere werden mit Hilfe der 1H-NMR-Signale der Methylgruppen sowie durch 13C-NMR- und Massenspektroskopie unterschieden und zugeordnet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 470-474 
    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 diastereomers of 16 1,3-oxa-, 1,3-aza- and 1,3- thiaphospholanes were assigned by means of the coupling constants 2J(P—C—H) and 3J(P—C—CH3) and the linewidths of the 31P signals and 1H chemical shifts of CH3 groups. It is shown that the change in the 31P chemical shifts allows the estimation of the relative configuration in these compounds.
    Notes: Die Diastereomeren von 16 1,3 Oxa-, 1,3-Aza-und 1,3-Thiophospholanen wurden mit Hilfe der Kopplungs-konstanten 2J(P—C—H) und 3J(P—C—CH3), der Signalbreite der 31P-Signale und der 1H-chemischen Verschiebungen der CH3-Gruppen zugeordnet. Es wird gezeigt, daß auch die 31P-chemischen Verschiebungen eine Bestimmung der relativen Konfiguration dieser Verbindungen gestatten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 478-484 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1H NMR chemical shifts of 18 methyl substituted cyclohexane-1,2-dicarboxylic anhydrides were determined. In compounds with asymmetric substitution vicinal coupling constants were measured. In the series of trans-anhydrides it can be deduced from the NMR data, that the 6-membered ring has a chair-like conformation. Additionally, in the series of the cis-anhydrides a twisted chair conformation is favoured for the most part.
    Notes: Die chemischen Verschiebungen der 1H-NMR-Spektren von 18 methylsubstituierten Cyclohexandicarbonsäure-(1,2)-anhydriden wurden bestimmt. Von den unsymmetrisch sub-stituierten Verbindungen wurden die vicinalen Kopplungskonstanten ermittelt. Bei den trans-Anhydriden lässtsich aus den NMR-Daten ableiten, dass der Sechsring in einer sesselähnlichen Form vorliegt. Auch bei den cis-Anhydriden sind in den meisten Fällen Konformationen mit verdrillter Sesselanordnung des Cyclohexans bevorzugt.
    Additional Material: 4 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 450 (1979), S. 70-78 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR Investigations on Dimeric Dialkylthallium Compoounds with (TIX)2 Four-membered Ring StructureNMR investigations on dimeric dialkylthallium amides and on dimethylthallium diphenylphosphide indicate a significant influence of the largeness of the bridging groups on the binding strength in the (TIX)2-four-membered ring structure. Exchange reactions among different dimeric dialkylthallium compounds give evidence of a dimer-monomer equilibrium, which is of fundamental importance for the reactivity and the reaction mechanisms of these compounds.
    Notes: NMR-Untersuchungen an dimeren Dialkylthalliumamiden und am Dimethylthalliumdiphenylphosphid indizieren einen signifikanten Einfluß der Größe der Brückengruppen auf die Bindungsstärke in den (TIX)2-Vierringen. Austauschreaktionen zwischen unterschiedlichen dimeren Dialkylthalliumverbindungen beweisen ein Dimer-Monomer-Gleichgewicht, das von grundsätzlicher Bedeutung für die Reaktivität und die Reaktionsmechanismen dieser Verbindungen ist.
    Additional Material: 3 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Transition Metal Diolefin Complexes. IV. Synthesis of Cobalt Coordination Compounds of Butadiene-d6The synthesis and characterization of two cobalt complexes of butadiene-1, 3-d6 with the empirical formula CoC12D19 and CoC12D18H will be described. The results of the mass spectroscopy and the 1H-NMR studies lead to the proposed structure:.1(π-butadiene-1, 3-d6)(π-3-methyl-d3-heptadienyl-d10)cobalt.2(π-butadiene-1, 3-d6)(π-3-methyl-d2-heptadienyl-d10)cobalt. .The mechanism of synthesis of the named complexes will be reported.
    Notes: Die Darstellung und Charakterisierung von zwei Kobaltkomplexen des perdeuterierten Butadiens mit den Summenformeln CoC12D19 (1) bzw. CoC12D18H (2) wird beschrieben. Die Ergebnisse der Massenspektroskopie und der 1H-NMR-Studien führen zu folgenden Strukturvorschlägen:.1(π-Butadien-1, 3-d6)(π-3-methyl-d3-heptadienyl-d10)kobalt.2(π-Butadien-1, 3-d6)(π-3-methyl-d2-heptadienyl-d10)kobalt..Der Mechanismus zur Bildung der beiden π-Komplexe wird beschrieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 440 (1978), S. 45-51 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Correlation of Tolman's Cone Angles with 1J(31p—1H) of Phosphonium FluorosulfonatesA 1H-n.m.r. study of three series of phosphonium salts [HPR3-nHn]X, and [HPPh2R1-nHn]X and (R = aliphatic substituent and H, X = SO3 F) gives a good relationship between increasing values of 1J(31P—1H) versus decreasing size of substituted phosphines. A method to obtain Tolman's cone angle is described.
    Notes: Die 1H-NMR-Untersuchung dreier Reihen von Phosphoniumsalzen [HPR3-nHn]X, [HPPhR2-nHn]X und [HPPh2R1-nHn]X (R = aliphat. Rest und H, X = SO3F) ergab einen inversen Zusammenhang von Werten der 1J(31p—1H)-Kopplungskonstante und Raumbedarf der Phosphine. Es wird eine Methode zur Bestimmung Tolmanscher Kegelwinkel auf der Basis von 1J(31p—1H)-Werten angegeben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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