Preparation of N-alkylpiperidines and N-alkylpyrrolidines

US4386208A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Rebafka · Eppelheim, DE
• Juergen Schossig
• Wolfgang Reiss · Ludwigshafen, DE
• Dieter Voges

Key dates

• Filing date: Jul 15, 1981
• Grant date: May 31, 1983
• Expiry date: Jul 15, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D295/023
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

N-Alkylpiperidines or N-alkylpyrrolidines are obtained by hydrogenating a corresponding N-alkyldicarboxylic acid imide over a fixed catalyst by first working to only partial conversion, for example of about 50%, and distilling off the required product together with water from the partially converted mixture, where appropriate with recycling of the unconverted remainder.