Synthesis and Structural Characterization of New Benzimidazole Compounds Derived from Electron-Rich Olefins Bearing 1,4- Bisbenzimidazole with CS2, PhNCS, and Chalcogens

Abstract

In this work, 1,4-bis(3-isopropylbenzimidazolidine-2-ylidene-1-yl)butane (1) and 1,4-bis(3,5(6)-dimethylbenzimidazolidine-2-ylidene-1-yl)butane (2) were reacted with oxygen, sulfur,selenium, tellurium, phenyl isothiocyanate, and carbon disulfide. New zwitterionic compounds (9-12) andcyclic urea derivatives of benzimidazole as one (3), thione (4,6), selenone (5,7), tellurone (8) wereprepared from enetetramines. The chemical structures of novel benzimidazole compounds were determinedby FTIR, 1H NMR, 13C NMR spectroscopic methods and elemental analysis.