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Short Paper | Regular issue | Vol 91, No. 11, 2015, pp.2153-2162
Published online, 23rd October, 2015
DOI: 10.3987/COM-15-13259
Iron(III) Tetranitrophthalocyanine Chloride Immobilized on Activated Carbon: Efficient, Excellent Chemoselectivity and Recyclable Catalyst for Synthesis of 2-Substituted Benzimidazoles

Jun Qiu, Yaodu Zhang, Chengwen Hua, Xiaofeng Gou, Bang Chen, and Junlong Zhao*

*College of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710069, China


The efficient and chemoselective preparation of 2-substituted benzimidazoles was established through the coupling of o-phenylenediamine with aldehydes by using iron(III) tetranitrophthalocyanine chloride immobilized on activated carbon as efficient catalyst in ethanol at room temperature. This method tolerated a variety of functional groups and had several advantages such as environmental friendliness, ease of manipulation, and a short reaction time. In addition, this catalyst can be recovered and reused for multiple cycles without loss in its catalytic activity.