Preparation of cyclic lactams

US6686465B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Frank Ohlbach · Mülheim an der Ruhr, DE
• Andreas Ansmann · Wiesloch, DE
• Peter Bassler · Viernheim, DE
• Rolf Fischer · Heidelberg, DE
• Hermann Luyken · Ludwigshafen, DE
• Stefan Maixner · Schwetzingen, DE
• Johann-Peter Melder · Schifferstadt, DE

Key dates

• Filing date: Oct 29, 2002
• Grant date: Feb 3, 2004
• Expiry date: Oct 29, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D201/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is provided for the preparation of cyclic lactams of formula (II): in which n and m can each have the values 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 and the sum of n+m is at least 3, preferably at least 4, and R1 and R2 are C1-C6-alkyl, C5-C7-cycloalkyl or C6-C12-aryl groups,by reacting a compound (I) of the formula in which R1, R2, m and n are as defined above and R are [sic] nitrile, carboxamide and carboxylic acid groups,with steam in the gas phase.