Method of making 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcycloh

Details Method of making 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcycloh Method of making 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcycloh

1993-11-12

1994-08-09

Evans, Joseph E.

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

Organic compounds

Oxygen containing

508 69, C07C 3720, C07C 3915, C07C 3917

Patent

active

053368126

ABSTRACT:
A process for making 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane via the acid catalyzed reaction of phenol and 3,3,5-trimethylcyclohexanone containing an organic thiol co-catalyst is described wherein the organic thiol is rejuvenated by treatment with a halogen acid and recycled to a fresh mixture of phenol and 3,3,5-trimethylcyclohexanone to make additional 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane.

REFERENCES:
patent: 2730552 (1956-01-01), Williamson
patent: 2791616 (1957-05-01), Luten
patent: 3491157 (1970-01-01), Dietzler et al.
patent: 4942265 (1990-07-01), Imuro et al.
patent: 4964890 (1990-10-01), Reuter et al.
patent: 4982014 (1991-01-01), Freitag et al.
patent: 5210328 (1993-05-01), Freitag et al.
patent: 5276213 (1994-01-01), Serini et al.

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