The reaction of 2-alkyl-1,3-dimethylbenzimidazolium salts with Grignard reagents gave addition products which were hydrolyzed to give ketones. A new method for the preparation of cyclohexyl ketones and isopropyl ketones is provided. The reaction of 2-alkyl-1,3-dimethylbenzimidazolium salts with Grignard reagents gave addition products which were hydrolyzed to give ketones. A new method for the preparation of cyclohexyl ketones and isopropyl ketones is provided.