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

摘要

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 DEG C. to 205 DEG 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.