Preparation of pyrrole and pyridine

US6538139B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Martin Schäfer · Arnstadt, DE
• Arnd Bottcher · Bischofswerda, DE
• Andreas Kramer · Zürich, CH
• Arthur Hohn · Tauberbischofsheim, DE
• Reinhard Kaczmarek · Worms, DE
• Erhard Henkes · Lorsch, DE

Key dates

• Filing date: Sep 5, 2002
• Grant date: Mar 25, 2003
• Expiry date: Sep 5, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D213/06
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Pyrroles of the formula (I) are prepared by dehydrogenating pyrrolidines of the formula (II) whereR1 and R2, independently of one another, are hydrogen or an aliphatic radical of 1 to 6 carbon atoms,or pyridines of the formula (III) are prepared by dehydrogenating piperidines of the formula (IV) whereR3, R4 and R5, independently of one another, are hydrogen or an aliphatic radical of 1 to 6 carbon atoms,in the presence of a supported noble metal catalyst, by a process in which the dehydrogenation is carried out in the presence of from 1 to 50% by weight, based on the pyrrolidine or piperidine and water, of water.