Solventless synthesis of 2-aryl-1-arylmethyl-1H-1,3-benzimidazoles catalyzed by Fe(ClO4)3 at room temperature

A series of 2-aryl-1-arylmethyl-1H-1,3-benzimidazoles was synthesized expeditiously in good yields from o-phenylene- diamines and aldehydes in the presence of Fe(ClO4)3 without solvent at room temperature.