One-pot synthesis of 2-ARYL-1-ARYLMETHYL-1H-1,3-benzimidazole derivatives using sulfonic acid functionlized silica (SiO2-Pr-SO3H) under solvent free conditions.

2-Aryl-1-arylmethyl-1H-1,3-benzimidazoles were synthesized by the reaction of o-phenylendiamine with different types of aromatic aldehydes in the presence of Sulfonic acid functionlized silica (SiO2-Pr-SO3H) as solid acid catalyst under solvent free condition at room temperature in good to excellent yields.