PROCESS FOR THE PREPARATION OF IMIDAZOLE-4(5)-MONOCARBONIC ACIDS, THEIR SALTS OR BETAINS

PROCESS FOR THE PREPARATION OF IMIDAZOLE-4(5)-MONOCARBONIC ACIDS, THEIR SALTS OR BETAINS

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 DEG to 230 DEG C. and under from 2 to 350 bar and, if desired, then reacti...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KEMPE, UWE, SCHLICK, ROLF, DOCKNER, TONI
Format: Patent
Sprache:eng ; ger
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung: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 DEG to 230 DEG 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.