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Issue 0, 1983
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Tannins and related compounds. Part 13. Isolation and structures of trimeric, tetrameric, and pentameric proanthicyanidins from cinnamon

Abstract

A proanthocyanidin trimer, two tetramers, and a pentamer have been isolated in their free phenolic forms from cinnamon, the bark of Cinnamomum zeylanicum(Lauraceae). Partial acid-catalysed degradation of these tannins with phenylmethanethiol, in conjunction with 1H- and 13C-n.m.r. analysis, has unequivocally established their structures as epicatechin-(4β→8, 2β→7) epicatechin-(4α→8)-epicatechin (5); epicatechin-(4β→8, 2β→7)-epicatechin-(4α→8)-epicatechin (6); epicatechin-(4β→6)-epicatechin-(4β→, 2β→7)-epicatechin-(4α→8)-epicatechin (7); and epicatechin-(4β→8)-epicatechin-(4β→8)epicatechin-(4β→8, 2β→7)-epicatechin-(4α→8)-epicatechin (8).

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Article type: Paper
DOI: 10.1039/P19830002139
J. Chem. Soc., Perkin Trans. 1, 1983, 2139-2145

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    Tannins and related compounds. Part 13. Isolation and structures of trimeric, tetrameric, and pentameric proanthicyanidins from cinnamon

    G. Nonaka, S. Morimoto and I. Nishioka, J. Chem. Soc., Perkin Trans. 1, 1983, 2139
    DOI: 10.1039/P19830002139

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