Summary.
Sulfamic acid/methanol was found to be an efficient catalytic system for the synthesis of benzimidazole compounds through the condensation of o-phenylenediamine with orthoester in high yields at room temperature.
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Zhang, ZH., Li, TS. & Li, JJ. A Highly Effective Sulfamic Acid/Methanol Catalytic System for the Synthesis of Benzimidazole Derivatives at Room Temperature. Monatsh. Chem. 138, 89–94 (2007). https://doi.org/10.1007/s00706-006-0566-1
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DOI: https://doi.org/10.1007/s00706-006-0566-1