Journal
TETRAHEDRON LETTERS
Volume 43, Issue 25, Pages 4545-4549Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(02)00745-1
Keywords
catechin; polyphenols; C-13 NMR; deprotonation; dissociation constant
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The C-13 NMR studies of catechin and epicatechin upon addition of base are reported. These flavan-3-ols show an interesting deprotonation behavior, dramatically different from the other type of flavonoids: catechin and epicatechin exhibit competitive deprotonation on B and A ring leading to a mixture of different monophenolates. (C) 2002 Published by Elsevier Science Ltd.
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