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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3771-3779 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 13C Nuclear Magnetic Resonance Spectroscopy of Diastercomeric Dicarboxylic Acids: 2,3-Dimethylsuccinic, 2-Ethyl-3-methylsuccinic, and 3-Ethyl-4-methyladipic AcidsProton noise-decoupled 13C n.m.r. spectra of 2,3-dimethyl- (1m/1r) and 2-ethyl-3-methyl-succinic acid (2e/2t) as well as of 3-ethyl-4-methyladipic acid (3e/3t) in [D6]acetone show differences in chemical shifts for all carbons between meso and racemic (1) and between erythro and threo (2 and 3) diastereomers, respectively. The chemical shift differences allow conclusions to be made about the relative populations of rotamers in the conformational equilibria.
    Notes: Die unter Rauschentkopplung der Protonen erhaltenen 13C-NMR-Spektren von 2,3-Dimethyl-(1m/1r) und 2-Äthyl-3-methylbernsteinsäure (2e/2t) sowie von 3-Äthyl-4-methyladipinsäure (3e/3t) in [D6]Aceton zeigen für alle Kohlenstoffatome unterschiedliche chemische Verschiebungen in den meso- und racem.-(bei1) bzw. den erythro- und threo-Diastereomeren (bei 2 und 3). Die Verschiebungsdifferenzen ermöglichen Aussagen über die relativen Besetzungszustände der einzelnen Rotameren in den konformativen Gleichgewichten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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