process for the production of 3,3 ', 5,5' - tetra isopropyl - 4,4 '- hydroxydiphenyl

摘要

1318100 Bisphenol CIBA-GEIGY (UK) Ltd 6 Aug 1971 [8 Aug 1970] 38316/70 Heading C2C The invention comprises a single-stage process for the preparation of 3,3SP1/SP,5,5SP1/SP-tetraisopropyl- 4,4SP1/SP-dihydroxy diphenyl which comprises oxidizing 2,6-diisopropyl phenol in an aqueous medium with a ferric salt of a non-oxidizing acid, the ratio of ferric iron in the ferric salt to phenol being from 0À65 to 3À0 : 1 atoms per mole and the ratio of water to phenol being up to 500 : 1 molar, the actual ratios used being so selected and correlated and the time of reaction being such that the yield of the dihydroxy diphenyl is at least 60% calculated on the phenol starting material, and recovering the dihydroxy diphenyl from the reaction mixture.