Preparation of .delta.-formylvalerates

US4801738A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinz-Walter Schneider · Ludwigshafen, DE
• Rudolf Kummer · Bischofswerda, DE
• Volker Taglieber · Ludwigshafen, DE

Key dates

• Filing date: May 9, 1984
• Grant date: Jan 31, 1989
• Expiry date: May 9, 2004

Classification

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

Abstract

.delta.-Formylvalerates are prepared by a process wherein a 3-pentenoate is treated with an isomerization catalyst at elevated temperatures and a 4-pentenoate is distilled off, and the resulting 4-pentenoate is reacted with carbon monoxide and hydrogen at from 80 to 160.degree. C. under from 1 to 30 bar in the presence of a rhodium carbonyl complex which has been modified with tertiary organic phosphines or phosphites.