Condensed tannins: condensation mode and sequence during formation of synthetic and natural triflavonoids
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 11,p. 510-512
- https://doi.org/10.1039/c39790000510
Abstract
The first synthesis of 4,8:4,6-linked all-trans- and 2,3-trans-3,4-trans: 2′,3′-trans: 2″,3″-trans-3″,4″-cis-bi[(–)-fisetinidol]-(+)-catechins and recognition of their distribution in nature gives an insight into the mode and sequence of condensations leading to such key triflavonoid intermediates during tannin formation; the synthesis taken in conjuction with c.d. spectra established their absolute configurations.Keywords
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