Preparation of N-substituted 2-pyrrolidones

US5434273A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Feb 4, 1994
• Grant date: Jul 18, 1995
• Expiry date: Feb 4, 2014

Classification

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

Abstract

The preparation of N-substituted 2-pyrrolidones (I) by the reaction of maleic acid, fumaric acid, or succinic acid or functional derivatives of these acids (compounds II) with a primary amine (III) or by the reaction of amides or imides derived from II and III under hydrogenating conditions in a synthesis stage followed by isolation, by distillation, of I and other volatile components from the resulting reaction mixture, in which the residues present following distillation are subjected to further hydrogenation treatment and the compound (I) thus formed is isolated by distillation.