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    Author(s): Richard W. Hemingway; Peter E. Laks
    Date: 1985
    Source: Journal of the Chemical Society Chemical Communications 746-747
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (428 KB)


    Roux,1 Haslam,2-4 and Stafford5-8 have proposed differing biogenetic schemes for the formation of proanthocyanidins (condensed tannins) in plants. All three schemes suffer from difficulties in explaining the formation of the 2R,3R-(2,3-cis)-proanthocyanidins that predominate in plant tannins. Stafford5-8 has postulated that a C-3 epimerase acts on (+)-dihydroquercetin to provide the 2R,3S-(2,3-cis)-dihydroflavanol that would then be reduced to the corresponding 2R,3R,4S- (or 4R-) flavan-3,4-diol.

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    Hemingway, Richard W.; Laks, Peter E. 1985. Condensed tannins: A proposed route to 2R,3R-(2,3-cis)-proanthocyanidins. Journal of the Chemical Society Chemical Communications 746-747

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