Preparation of butanedicarboxylic esters

US4310686A · kind A · utility

Assignee

• BASF SE

Inventors

• Rudolf Kummer · Bischofswerda, DE
• Heinz-Walter Schneider · Ludwigshafen, DE
• Volker Taglieber · Ludwigshafen, DE
• Franz-Josef Weiss · Schifferstadt, DE

Key dates

• Filing date: May 27, 1980
• Grant date: Jan 12, 1982
• Expiry date: May 27, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/38
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of butanedicarboxylic acid esters, wherein PA0 (a) an aqueous cobalt salt solution is treated with excess carbon monoxide and hydrogen in the presence of active charcoal laden with cobalt carbonyl, PA0 (b) the resulting aqueous solution of cobalt carbonyl hydride is extracted with butadiene or a butadiene containing hydrocarbon mixture and the aqueous phase is separated off, PA0 (c) the butadiene, or butadiene/hydrocarbon mixture, containing cobalt carbonyl hydride, cobalt carbonyl and butenyl-cobalt tricarbonyl, is reacted with carbon monoxide and excess C.sub.1 -C.sub.4 -alkanol in the presence of a tertiary nitrogen base, PA0 (d) the resulting reaction mixture is freed from the tertiary nitrogen base contained therein, down to a content of from 0.1 to 0.3 mole per mole of pentenoic acid ester, and from excess hydrocarbons, and the pentenoic acid ester remaining in the reaction mixture is reacted with carbon monoxide and excess C.sub.1 -C.sub.4 -alkanol in the presence of the cobalt carbonyl and tertiary nitrogen base contained in the reaction mixture, PA0 (e) the reaction mixture is treated with an oxidizing agent in the presence of the aqueous acid…