Abstract
The structures of proanthocyanidin A-l (2) and two related proanthocyanidins, tentatively named A-4 (3) and A-5’ (4), have been established unambiguously on the basis of spectroscopic evidence and chemical correlations with the structurally known proanthocyanidin A-2 (1). Chemical transformation of singly linked proanthocyanidin B-l (6) into 2 also confirmed the stereostructure of 2. © 1987, The Pharmaceutical Society of Japan. All rights reserved.
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Nonaka, G. I., Morimoto, S., Nishioka, I., Kinjo, J. E., & Nohara, T. (1987). Tannins and Related Compounds. L.1) Structures of Proanthocyanidin A-l and Related Compounds. Chemical and Pharmaceutical Bulletin, 35(1), 149–155. https://doi.org/10.1248/cpb.35.149
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