Method of producing 3, 5, 5-trimethylcyclohexa-3-ene-1-one(.beta.-isophorone) by the isomerization of 3, 5, 5-trimethylcyclohexa-2-ene-1-(.alpha.-isophorone)

US6005147A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Steffen Krill · Mühltal, DE
• Gunes Giray · Kleinostheim, DE
• Klaus Huthmacher · Gelnhausen, DE
• Frank Hubner · Ober-Ramstadt, DE
• Herbert Tanner

Key dates

• Filing date: Sep 26, 1997
• Grant date: Dec 21, 1999
• Expiry date: Sep 26, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/67
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method of producing 3,5,5-trimethylcyclohexa-3-ene-1-one (.beta.-isophorone) including a catalyst of an oxide or mixed oxide of at least one element of the groups IIa, VIII, Ib, IIIa and Va of the periodic system. Isomerization is carried out without the addition of an organic base. The space-time yield in the production of .beta.-isophorone by the isomerization of .alpha.-isophorone is at a level suitable for an industrial application. .beta.-isophorone is especially suitable as an intermediate product for producing ketoisophorone.