ISSN:
1573-8388
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 1. Five flavans have been isolated from the stems ofCotoneaster oligantha A. Pojark, and have been identified; two of them are (+)-catechin and (−)-epicatechin and three are stereoisomeric dimeric procyanidins. 2. The proanthocyanidins have the structure of dimers of 3′,4′,5,7-tetrahydroxyflavan-3-ol with C4-C8 (or C6) bonds between the flavan moieties and with the cis (2R:3R) configuration of the asymmetric centers (flavans 3 and 5) and trans (2R:3S:4S) configuration of the “upper” half and the cis configuration of the “lower” half of the molecule (flavan 4).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01134620
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