Chemical and Pharmaceutical Bulletin
Online ISSN : 1347-5223
Print ISSN : 0009-2363
ISSN-L : 0009-2363
Tannins and Related Compounds. XIX. Eight New Gallotannins Containing a Proto-quercitol Core from Quercus stenophylla MAKINO. (3)
HIROAKI NISHIMURAGENICHIRO NONAKAITSUO NISHIOKA
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Keywords: spin-decoupling
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1984 Volume 32 Issue 5 Pages 1741-1749

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Abstract

By a combination of adsorption and partition chromatography, eight new proto-quercitol gallates (compounds 1-8) have been isolated from the tannin fraction of the bark of Quercus stenophylla MAKINO (Fagaceae). Their structures have been characterized mainly by 1H-NMR examinations combined with the spin-decoupling techniques as 4, 5-di-O-gallate (1), 3, 4, 5-tri-O-gallate (2), 2, 4, 5-tri-O-gallate (3), 1, 4, 5-tri-O-gallate (4), 1, 3, 5-tri-O-gallate (5), 1, 3, 4, 5-tetra-O-gallate (6), 1, 2, 4, 5-tetra-O-gallate (7) and 1, 2, 3, 4, 5-penta-O-gallate (8) of proto-quercitol (desoxyinositol).

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© The Pharmaceutical Society of Japan
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