Synthesis of Trisubstituted Imidazoles Using Lewis and Bronsted Acid Catalysts

An efficient and one-pot method for the preparation of trisubstituted imidazoles by condensation of benzil, different aldehydes and ammonium acetate in the presence of   a catalytic amount of NiSO4.7H2O or H3BO3 under different conditions is reported.                       Key Words : T risubstituted imidazoles, Multi-component                                      reactions, NiSO4.7H2O, H3BO3, one-pot                                     reactions,  solid acid catalysts.