Method for the production of purified 1,3-substituted imidazolium salts

US7501522B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Matthias Maase · Speyer, DE
• Klemens Massonne · Bad Dürkheim, DE

Key dates

• Filing date: Jun 30, 2004
• Grant date: Mar 10, 2009
• Expiry date: Jan 1, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D233/56
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing purified 1,3-substituted imidazolium salts of the formula (I)by reacting a 1,3-substituted imidazolium salt of the formula (II),with a strong base at from 20 to 250° C. while distilling off the 1,3-substituted imidazol-2-ylidene formed, in which the 1,3-substituted imidazol-2-ylidene which has been distilled off is brought into contact in the gaseous state with the protic acid HaA (III) and/or the 1,3-substituted imidazol-2-ylidene which has been distilled off is passed in the gaseous or condensed state into a receiver comprising the protic acid HaA (III).