Patent ID: 7501522
Filing Date: 2009-03-10
Classification: C07D

Abstract:
1. A process for preparing purified 1,3-substituted imidazolium salts of the formula (I) where the radicals R and A which comprises reacting a 1,3-substituted imidazolium salt of the formula (II), where the radicals R the anion Y where y is a positive integer and indicates the charge on the anion, with a strong base at from 20 to 250° C. while distilling off the 1,3-substituted imidazol-2-ylidene formed, wherein the 1,3-substituted imidazol-2-ylidene which has been distilled off is brought into contact in the gaseous state with the protic acid 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 H a A (III).