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  • 1970-1974  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 245-249 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some 5-alkylidene 2-alkyl 1,3-dioxans have been studied by NMR. Analysis of the spectra leads to the conclusion that these derivatives are predominantly in the chair form, the alkyl substituent on carbon 2 being in the equatorial position. In the case of 5-alkylidene 1,3 dioxans unsubstituted at carbon 2, there is a rapid ring inversion with a very low energy barrier.
    Notes: Un certain nombre d'alcoylidène-5 alcoyl-2 dioxannes-1,3 ont été étudiés par RMN. L'analyse des spectres permet de conclure à une conformation chaise prédominante de ces dérivés, le substituant alcoyle sur carbone 2 se plaçant en position équatorial. Pour les alcoylidène-5 dioxannes-1,3 non substitués sur carbone 2 il y a inversion rapide du cycle avec une barrière énergétique extrěmement faible.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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