Preparation of 5-formylvaleric esters

US5003102A · kind A · utility

Assignee

• BASF SE

Inventors

• Werner Bertleff · Viernheim, DE
• Rolf Fischer · Heidelberg, DE
• Rudolf Kummer · Bischofswerda, DE
• Franz Merger · Bischofswerda, DE
• Heinz-Walter Schneider · Ludwigshafen, DE

Key dates

• Filing date: Jun 15, 1988
• Grant date: Mar 26, 1991
• Expiry date: Jun 15, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/347
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

5-Formylvaleric esters are prepared by a process which comprises the following steps: PA1 (a) Hydroformylation of a pentenoic ester by reaction with carbon monoxide and hydrogen at elevated temperatures and under superatmospheric pressure in the presence of a carbonyl complex of a metal of group 8 of the Periodic Table with formation of a mixture of 5-, 4- and 3-formylvaleric esters, PA1 (b) Isolation of the 5-formylvaleric ester from the resulting mixture of 5-, 4- and 3-formylvaleric esters, a mixture essentially consisting of 4- and 3-formylvaleric esters remaining, PA1 (c) Cleavage of the mixture essentially consisting of 4- and 3-formylvaleric esters at from 50.degree. to 400.degree. C. in the presence of a catalyst to give pentenoic esters and PA1 (d) Recycling of the pentenoic esters to stage (a).