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Paper | Regular issue | Vol 48, No. 9, 1998, pp.1759-1767
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8193
Regiospecific Demethylation-Sulfonation of 2',3'-Dimethoxyflavones

Amar Habsaoui, José Luis Franquet Cami, Jean Claude Wallet,* and Emile M. Gaydou

*Laboratorie de Phytochimie, Case 412, Faculté del Sciences de St-Jérome, Avenue Escadrille Normandie-Niemen 13397 Marseille Cedex 20, France

Abstract

By a careful control of the temperature at 85 °C, the selective demethylation of 2’,3’-dimethoxyflavones with sulfuric acid occurs at the 2’-hindered methoxy group followed by para sulfonation. At higher temperature, demethylation is complete.