Process for the preparation of 4'-hydroxybiphenyl-4-...

Details Process for the preparation of 4'-hydroxybiphenyl-4-... Process for the preparation of 4'-hydroxybiphenyl-4-...

C - Chemistry, Metallurgy

07

C

260/512.2

C07C 65/105 (2006.01) C07C 51/347 (2006.01) C07C 51/377 (2006.01)

Patent

CA 1287360

ABSTRACT A process for the preparation of 4'-hydroxy- biphenyl-4-carboxylic acid by reacting a cyclohexanone- 4-carboxylic acid compound with phenol in the presence of an acid catalyst, and then subjecting the resulting 4,4-bis(4-hydroxyphenyl)cyclohexanecarboxylic acid compound to decomposition and dehydrogenation reactions in the presence of a base and a dehydrogenation catalyst. The aforesaid cyclohexanone-4-carboxylic acid compound is obtained by catalytically hydrogenating a 4-hydroxy- benzoic acid compound in a secondary alcohol or tertiary alcohol solvent, and the reaction mixture thus obtained is directly used for the reaction with phenol.

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