Preparation of N-substituted pyrrolidones

US5157127A · kind A · utility

Inventors

• Hans-Juergen Weyer · Mannheim, DE
• Rolf Fischer · Heidelberg, DE
• Wolfgang Harder · Weinheim, DE

Key dates

• Filing date: Jun 4, 1991
• Grant date: Oct 20, 1992
• Expiry date: Jun 4, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D207/267
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of N-substituted pyrrolidones by the catalytic hydrogenation of maleic anhydride, maleic acid and/or fumaric acid in the presence of a primary amine and a solvent, at elevated temperature and pressure, wherein a catalyst is used which contains cobalt and at least one of the elements manganese, copper, phosphorus, molybdenum and/or sodium.