Method for producing 3, 5, 5-trimethylcyclohexa-3-en-1-one

Details Method for producing 3, 5, 5-trimethylcyclohexa-3-en-1-one Method for producing 3, 5, 5-trimethylcyclohexa-3-en-1-one

1997-10-27

1999-07-27

Geist, Gary

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

Organic compounds

Oxygen containing

C07C 4911

Patent

active

059292857

ABSTRACT:
Highly purified 3,5,5-trimethylcyclohexa-3-en-1-one is produced with a high production efficiency by inhibiting thermal decomposition of an isomerization catalyst. The method comprises isomerizing 3,5,5-tri-methylcyclohexa-2-en-1-one (.alpha.-isophorone) in the presence of an isomerization catalyst under reduced pressure at a reaction temperature of 90.degree. C. to 205.degree. C., and simultaneously distilling the reaction product, thereby inhibiting thermal decomposition of the isomerization catalyst. This method provides the isomerized product at a high level of the unit-time production for a long period, and prevents contamination caused by the decomposed product of the isomerization catalyst.

REFERENCES:
patent: 4005145 (1977-01-01), Widmer

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