Purification of crude pyrroles

US5502213A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Pfab · Schwarzheide, DE
• Peter Wahl · Ladenburg, DE
• Dieter Franz · Ludwigshafen, DE

Key dates

• Filing date: Jan 21, 1994
• Grant date: Mar 26, 1996
• Expiry date: Jan 21, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D207/323
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for purifying crude pyrroles obtained in the preparation of pyrroles of the general formula I ##STR1## where R is hydrogen or a C.sub.1 -C.sub.6 -alkyl radical, which comprises treating the mixture containing the crude pyrrole with an acid or an activated carboxylic acid derivative and removing the pyrrole from the mixture by distillation at reduced pressure and at a bottom temperature of up to 160.degree. C.