SBSA as a New and Efficient Catalyst for the One-Pot Green Synthesis of Benzimidazole Derivatives at Room Temperature

silica boron sulfonic acid (SBSA) was easily prepared and used as a new and efficient solid acid catalyst for the synthesis of benzimidazole derivatives with high isolated yields. Various substituted benzimidazoles were synthesized by a combination of o-phenylenediamines and aldehydes in the presence of boron sulfonic acid in with good yields in water and under a mild reaction conditions. This method is also applicable for precursors such as: aromatic and unsaturated aldehydes and o-phenylenediamines.