HIGH YIELD PROCESS FOR PREPARING 3,3',5,5'-TETRAALKYL-4,4'-BIPHENOL

摘要

4,4 min - biphenol can be prepared by dealkylation of the hydrogenation product of a diphenoquinone of the formula: wherein R is a tertiary alkyl group of 4-8 carbon atoms. Additional inventive features includes hydrogenation of an alkylated diphenoquinone in the presence of a heterogeneous catalyst and an alkyl benzene solvent and the dealkylation of a 3,3 min ,5,5 min diphenol by heating with an acid catalyst in an at least 4-fold molar excess of an alkyl benzene.