Tannins and Related Compounds. LVI. Isolation of Four New Acylated Flavan-3-ols from Oolong Tea. (1)

Abstract

A chemical examination of the aqueous acetone extract of commercial oolong tea has led to the isolation of four new acylated flavan-3-ols 1-4, together with the known compounds 5-13. On the basis of chemical and spectroscopic evidence, compounds 1-4 have been characterized as (-) - epiafzelechin 3-Ο-gallate (1), (-) -epicatechin 3-Ο- (4-Ο-methyl) -gallate (2), (-) -epicatechin 3-Ο-p-hydroxybenzoate (3) and (-) -epigallocatechin 3-Ο-cinnamate (4).