Process for the preparation of N-substituted lactams

US5338861A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Artur Botta · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Otto Immel · Krefeld, DE
• Lothar Puppe · Burscheid, DE

Key dates

• Filing date: Jul 24, 1992
• Grant date: Aug 16, 1994
• Expiry date: Jul 24, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Substituted lactams of the formula ##STR1## can be prepared from lactam N-carboxylates or lactim O-carboxylates of the formulae ##STR2## by thermal or mixed thermal and catalysed CO.sub.2 elimination at 80.degree.-450.degree. C. Lactams substituted on the N atom by aliphatic groups such as those produced herein are useful as industrial aprotic solvents.