The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2001
Filed:
May. 13, 1999
Steffen Krill, Speyer, DE;
Stephan Kretz, Biebergemund, DE;
Hans-Joachim Hasselbach, Gelnhausen, DE;
Klaus Huthmacher, Gelnhausen, DE;
Rainer Hahn, Budingen, DE;
Hermann Schmitt, Rodenbach, DE;
Degussa-Huls Aktiengesellschaft, Hanau, DE;
Abstract
A process for the preparation of 3,5,5-trimethylcyclohexa-3-en-1-one (&bgr;-isophorone) by isomerization of 3,5,5-trimethylcyclohexa-2-en-1-one (&agr;-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 &bgr;-isophorone is high. &bgr;-Isophorone is particularly suitable as an intermediate product for the preparation of ketoisophorone.