Process for the preparation of cyclohexane-1,3-dione from .delta.-ketohexanoic acid ester

US4409400A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Werner Muller · East Greenwich, US
• Karl E. Mack · Wiesbaden, DE
• Hansjorg Hey · Hofheim, DE

Key dates

• Filing date: Apr 21, 1982
• Grant date: Oct 11, 1983
• Expiry date: Apr 21, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/455
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Cyclohexane-1,3-diones are prepared by passing .delta.-ketocarboxylic acid esters in the gaseous phase over a temperature of from 250.degree. C. to 500.degree. C. at a catalyst. The catalyst contains at least one element of groups III B or IV B of the Periodic System in the form of a compound. Particularly preferred catalysts are thorium compounds on charcoal carriers.