Abstract
Abstract Gossypol and its 1: 1 complexes with copper acetate in acetonitrile were studied by FTIR and UV-visible spectroscopy. With the complexation with Cu cation the tautomeric equilibrium of gossypol is completely shifted from the aldehyde-aldehyde to the lactol-lactol tautomer. The acidic character of O11H group in the gossypol-Cu complex led to the selective esterification of the lactol form of gossypol by the acetate group.
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