Abstract
Tungstate sulfuric acid (TSA) was prepared, characterized, and applied for direct synthesis of novel and known benzimidazoles through a condensation reaction of o-phenylenediamines with orthoesters under solvent-free conditions. TSA was characterized by powdered X-ray diffraction (XRD), X-ray fluorescence (XRF), and FTIR spectroscopy. This novel and eco-friendly method is very cheap and has many advantages such as excellent yields, recyclable and eco-friendly catalyst, and simple work-up procedure.
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Karami, B., Khodabakhshi, S. & Haghighijou, Z. Tungstate sulfuric acid: preparation, characterization, and application in catalytic synthesis of novel benzimidazoles. Chem. Pap. 66, 684–690 (2012). https://doi.org/10.2478/s11696-012-0152-4
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DOI: https://doi.org/10.2478/s11696-012-0152-4