Tannins and Related Compounds. XL. : Revision of the Structures of Punicalin and Punicalagin, and Isolation and Characterization of 2-O-Galloylpunicalin from the Bark of Punica granatum L.

Abstract

The structures of punicalin and punicalagin, isolated from the bark of Punica granatum L. (pomegranate), have been revised to 4, 6-(S, S)-gallagyl-D-glucose (1) and 2, 3-(S)-hexahydroxy-diphenoyl-4, 6-(S, S)-gallagyl-D-glucose (2), respectively, on the basis of chemical and spectroscopic evidence. In addition, a new hydrolyzable tannin, 2-O-galloyl-4, 6-(S, S)-gallagyl-D-glucose (3) was isolated from the same plant source, and characterized.