A study of the reactions of flavanoids with nucleophiles

<p>The reactions with nucleophiles of 4-substituted flavans variously methoxylated are studied. The partial epimerisation of 4β-acetoxyflavans in acetic acid/acetic anhydride mixtures and of flavan-4β-ols in aqueous acid, providing preparatively useful routes to 4α-acetoxyflavans and flavan-4α...