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  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 457-465 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cellulose derivatives are used as examples to show how NMR spectroscopy - at 100 and particularly at 220 MHz - may be applied in structural studies of polysaccharides, namely to distinguish between hexoses and pentoses, to determine the configuration and conformation of the monomer units in the polymer as well as the type of the glycosidic bond. For such investigations the acetyl, benzoyl or methyl derivatives are required. The degree of polymerization (Pw) of the acetates or methyl ethers should be Pw 〈 200 and in the case of benzoates Pw 〈 100.
    Notes: Am Beispiel der Cellulosederivate wurde gezeigt, wie es mit Hilfe der PR-Spektroskopie - speziell bei einer Meßfrequenz von 220 MHz - möglich ist, in Polysacchariden zwischen einer Hexose und Pentose zu unterscheiden, die Konfiguration und die Konformation des Monomerbausteins im Polymeren sowie die Art der glycosidischen Bindung zu bestimmen. Voraussetzung für diese Untersuchungen sind die Acetyl-, Benzoyl- oder Methylderivate des Polysaccharids, wobei der Polymerisationsgrad bei den Acetaten und den Methyläthern Pw 〈 200, bei den Benzoaten sogar Pw 〈 100 sein sollte.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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