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  • Analytical Chemistry and Spectroscopy  (2)
  • 1985-1989
  • 1975-1979  (2)
Collection
Keywords
Publisher
Years
Year
  • 1
    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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  • 2
    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.
    Type of Medium: Electronic Resource
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