Preparation of aliphatic &agr;, &ohgr;-dicarboxylic acids

US6437180B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Michael Schelhaas
• Helmut Greiving · Wuppertal, DE
• Manfred Jautelat · Burscheid, DE

Key dates

• Filing date: May 11, 2000
• Grant date: Aug 20, 2002
• Expiry date: May 11, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/285
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing aliphatic C4-18 &agr;,&ohgr;-dicarboxylic acids by oxidation of C6-20 &agr;,&ohgr;-dienes with hydrogen peroxide or compounds which release hydrogen peroxide under the reaction conditions as is characterized in that the reaction is carried out in the presence of a transition metal catalyst of group VI and of a mixture containing at least one organic acid and one aprotic organic solvent. A specific temperature profile is maintained at different phases of the reaction, which increases yield and selectivity.