Process for producing 3,3',5,5'-tetra-t butylbiphenol

Details Process for producing 3,3',5,5'-tetra-t butylbiphenol Process for producing 3,3',5,5'-tetra-t butylbiphenol

1998-01-30

2000-09-12

Wilson, James O.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568722, 568803, C07C 3912

Patent

active

061180297

ABSTRACT:
A batch or continuous process produces highly pure 3,3',5,5'-tetra-t-butylbiphenol suitable as a starting material for the synthesis of 4,4'-biphenol. The process for producing 3,3',5,5'-tetra-t-butylbiphenol comprises conducting an oxidation coupling of purified 2,6-di-t-butylphenol(i) or crude 2,6-di-t-butylbiphenol(ii), said crude 2,6-di-t-butylphenol being obtained by reacting isobutylene with phenol in the presence of an aluminum catalyst, and removing the aluminum catalyst. The 2,6-di-t-butylphenol is oxidatively coupled in an alkali metal catalyst mixture comprising (1) an alkali metal catalyst and alkylphenols, or (2) alkali metal catalyst, alkylphenols and phenol to produce 3,3',5,5'-tetra-t-butylbiphenol. The oxidative coupling is conducted together with 10-30% by weight of phenol and/or t-butylphenol per 100% by weight of 2,6-di-t-butylphenol in the presence of an alkali metal catalyst.

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Database WPI, Section Ch, Week 9320, Derwent Publications Ltd., London, GB; Class A41, An 93-164392, XP002064633, & JP 05 097 740 A (Mitsubishi Petrochemical Co., Ltd.); (Apr. 20, 1993) Abstract.
Database WPI, Section Ch, Week 8642, Derwent Publications Ltd., London, GB; Class A41, AN 86-275562, XP002064634 & JP 61 200 935 A (Honshu Kagaku Kogyo KK) (Sep. 5, 1986) Abstract.

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