Journal
JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
Volume 11, Issue 5, Pages 1311-1319Publisher
SPRINGER
DOI: 10.1007/s13738-013-0400-8
Keywords
Magnetic nanoparticles; Heteropoly acids; Tungstosilicic acid; Benzoazoles; Water
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Funding
- Iran National Science Foundation (INSF) [88001894]
- research councils of Shiraz University
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The magnetic nanoparticles-supported tungstosilicic acid (TSAMNP) was found to be a highly efficient solid acid for the synthesis of benzoazoles in water. TSAMNP catalyst was achieved by the immobilization of tungstosilicic acid [H-4(W12SiO40)] species on the silica core-shell magnetic nanoparticles (Fe3O4@SiO2). A variety of aldehydes were successfully condensed with 1,2-diaminobenzene, 2-aminophenol and 2-aminothiophenol in water as a green solvent to synthesize benzoazoles in good-to-excellent yields. TSAMNP catalyst was easily separated from the reaction mixture and reused several times without any loss of efficiency.
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