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Novel silica tungstic acid (STA): Preparation, characterization and its first catalytic application in synthesis of new benzimidazoles

Paper ID Volume ID Publish Year Pages File Format Full-Text
50783 46813 2012 5 PDF Available
Title
Novel silica tungstic acid (STA): Preparation, characterization and its first catalytic application in synthesis of new benzimidazoles
Abstract

A novel silica tungstic acid (STA) as a highly efficient catalyst has been synthesized and employed for the cyclocondensation of 1,2-phenylenediamines with orthoesters under solvent-free conditions. Catalyst loadings can be as low as 1 mol% to give high yields of the corresponding benzimidazoles at 80 °C. To make the catalyst, sodium tungstate reacted with silica chloride under refluxing n-hexane. The STA as a novel solid acid was characterized by X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► New silica tungstic acid (STA) was prepared through the simple experimental procedure. ► Silica tungstic acid was characterizaed by XRD, XRF and FT-IR spectroscopy. ► Silica tungstic acid was used as a green solid acid catalyst. ► Silica tungstic acid is recyclable and also exhibited very high activity.

Keywords
Silica tungstic acid; X-ray diffraction; X-ray fluorescence; Solvent-free; Benzimidazole
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 20, 5 April 2012, Pages 71–75
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us