PROCEDE DE PREPARATION DE DIPHENOLS

摘要

1347625 Preparation of dihydric phenols BRICHIMA SpA 3 Feb 1972 [17 July 1971] 5093/72 Heading C2C Catechol and hydroquinone are prepared by hydroxylating phenol with H 2 O 2 in the presence of a catalyst comprising trifluoroacetic acid or an acid having a pKa from 0À7 to 3 and in the presence of a monocarboxylic acid having 1 to 4 carbon atoms. Preferred acids of pK 0À7 to 3 are mono-, di-, or tri-chloroacetic acids, oxalic acid, phosphoric acid, benzene sulphonic acid or toluene sulphonic acid.