Preparation of imidazole-4(5)-monocarboxylic acids and their salts or betaines

US4672128A · kind A · utility

Assignee

• BASF SE

Inventors

• Uwe Kempe · Schifferstadt, DE
• Toni Dockner
• Rolf Schlick · Ludwigshafen, DE

Key dates

• Filing date: Jul 24, 1985
• Grant date: Jun 9, 1987
• Expiry date: Jul 24, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D233/90
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Imidazole-4(5)-monocarboxylic acids and their salts or betaines are prepared by reacting an imidazole with carbon dioxide and an alkali metal carbonate, an alkali metal bicarbonate and/or an alkali metal hydroxide at from 140.degree. to 230.degree. C. and under from 2 to 350 bar and, if desired, then reacting the product with an acid. The imidazole-4(5)-monocarboxylic acids which can be prepared by the process of the invention are useful starting materials for the preparation of dyes, crop protection agents and drugs.