ChemInform Abstract: Remarkable Influence of Substituent in Ionic Liquid in Control of Reaction: Simple, Efficient and Hazardous Organic Solvent Free Procedure for the Synthesis of 2-Aryl Benzimidazoles Promoted by Ionic Liquid, [pmim]BF4

A simple and efficient procedure for the synthesis of 2-substituted benzimidazoles has been developed by a one-pot reaction of o-phenylenediamine with aromatic aldehydes in the presence of an ionic liquid, 1-methyl-3-pentylimidazolium tetrafluoroborate, [pmim]BF4 at room temperature in open air without any organic solvent. The ionic liquid is recycled. A remarkable influence of the substituent on the imidazolium unit of the ionic liquid on the outcome of the reaction is observed.