The reaction of loblolly pine (Pinus taeda L.) bark tannins with sodium hydrogen sulphite gave sodium epicatechin-(4β)-sulphonate (1) and sodium epicatechin-(4β→ 8)-epicatechin-(4β)-sulphonate (2) in high yield with only a minor amount of sodium 1-(3,4-dihydroxyphenys)-2-hydroxy-3-(2,4,6-trihdroxyphenyl)-propane-1-sulphonate (3).
L. Y. Foo, G. W. McGraw and R. W. Hemingway, J. Chem. Soc., Chem. Commun., 1983, 672 DOI: 10.1039/C39830000672
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