SCHEDULED MAINTENANCE
(–)-2,3-cis-3,4-cis-Flavan-3,3′,4,4′,7,8-hexaol [(–)-melacacidin] reacted rapidly with itself or pyrogallol under mild acidic conditions to yield stereospecific condensation products, suggesting that the formation of natural proanthocyanidins of the 7,8-dihydroxyflavanoid pattern is not chemically prohibited.
L. Y. Foo, J. Chem. Soc., Chem. Commun., 1985, 1273 DOI: 10.1039/C39850001273
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