Sulfated Tin Oxide: An Immensely Potent and Reusable Catalyst for the Synthesis of Benzimidazole Derivatives

Abstract

AbstractIn this research, a new strategy for synthesis of benzimidazoles via condensing o‐phenylenediamine and substituted aldehydes by adopting prepared sulfated tin oxide as solid heterogenous catalyst in water ethanol system (1:1‐v/v) at reflux condition has been developed. The solid sulfated tin oxide is synthesized and confirmed by XRD, EDS map, SEM images, and FTIR. The reaction is optimized for different solvents and loading of catalyst. The yields of all benzimidazole derivatives are observed in the range of 80–94%. All the synthesized benzimidazoles are analyzed by spectral data. The use of ecologically benign catalyst sulfated tin oxide, solvent system, ample substrate scope with good atom economy, environmental affordability, and easy work up makes this protocol green.