Process for the preparation of 3,5,5-trimethylcyclohexa-3-en-1-one (-isophorone) by isomerization of 3,5,5- trimethylcyclohexa-2-en-1-one (-isophorone)

摘要

A process for the preparation of 3,5,5-trimethylcyclohexa-3-en-1-one (-isophorone) by isomerization of 3,5,5-trimethylcyclohexa-2-en-1-one (-isophorone) in the liquid phase in the presence of a salt-like or organometallic catalyst. By using catalytic quantities of alkali-metal salts or alkaline-earth salts and/or their organometallic compounds, and without addition of a further auxiliary substance, the space-time yield in the preparation of -isophorone is high. -Isophorone is particularly suitable as an intermediate product for the preparation of ketoisophorone.