Abstract
ABSTRACT A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aromatic aldehydes in the presence of PVP- trifluoromethanesul-fonic acid is reported, and morphological investigation was reported by FT-IR. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product, and non-toxic catalyst. However, the reactions were performed in solvent-free and the catalyst could be reused for several runs. Keywords: Green chemistry; polymer-supported reagents; Benzimidazoles; reusable catalyst e-mail: Changiz.Karami@gmail.com INTRODUCTION In the last ten years, supported reagents on polymers have become increas-ingly applied in organic synthesis 1 , because the reactions are carried out with simple work-up, easy product isolation, and mild reaction conditions 2 . Benz-imidazole is a kind of substances which have found practical applications in organic synthesis 3 , and the benzimidazole nucleus are found in a variety of pharmaceuticals as cardiotonic agents,
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