Journal
CHEMICAL PAPERS
Volume 66, Issue 7, Pages 684-690Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.2478/s11696-012-0152-4
Keywords
orthoesters; o-phenylenediamine; tungstate sulfuric acid; benzimidazole; catalyst
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Funding
- Yasouj University, Iran
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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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