Accession Number : AD0698397

Title :   THE HYDROXYL STRETCHING FREQUENCIES AND CONFORMATIONS OF FLAVAN-4-OLS AND THIAFLAVAN-4-OLS,

Corporate Author : COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANIZATION CANBERRA (AUSTRALIA) DIV OF PLANT INDUSTRY

Personal Author(s) : Katekar,G. F. ; Moritz,A. G.

Report Date : 09 APR 1969

Pagination or Media Count : 6

Abstract : The hydroxyl stretching frequencies of some 2,4-cis and 2,4-trans flavan-4-ols, thiaflavan-4-ols, and related compounds have been measured in dilute carbon tetrachloride solution. Characteristic frequencies are observed at 3626/cm (free hydroxyl), 3616, and 3597/cm. The 3616 and 3597/cm bands are assigned to pseudo-axial and pseudo-equatorial hydroxyl groups respectively. Evidence is presented to show that the frequency shifts arise from differences in the interaction of the hydroxyl group with the pi-elections of the fused benzene ring, and that these flavans and thiaflavans exist in half-chair, rather than sofa conformations. (Author)

Descriptors :   (*ANTHOXANTHIN PIGMENTS, *INFRARED SPECTRA), MOLECULAR ISOMERISM, AUSTRALIA

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE