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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 7
BKCSDE 32(7)
July 20, 2011 

Alumina Supported Ammonium Dihydrogenphosphate (NH4H2PO4/Al2O3): Preparation, Characterization and Its Application as Catalyst in the Synthesis of 1,2,4,5-Tetrasubstituted Imidazoles
Anahita Emrani, Abolghasem Davoodnia, *Niloofar Tavakoli-Hoseini
Alumina supported ammonium dihydrogenphosphate, Heterogeneous catalysis, Solvent-free conditions, Tetrasubstituted imidazoles
Preparation of ammonium dihydrogenphosphate supported on alumina (NH4H2PO4/Al2O3) and its primary application as a solid acid supported heterogeneous catalyst to the synthesis of 1,2,4,5-tetrasubstituted imidazoles by a one-pot, four-component condensation of benzil, aromatic aldehydes, primary amines, and ammonium acetate under thermal solvent-free conditions were described. The results showed that the novel catalyst has high activity and the desired products were obtained in high yields. Furthermore, the products could be separated simply from the catalyst, and the catalyst could be recycled and reused with only slight reduction in its catalytic activity. Characterization of the catalyst was performed by FT-IR spectroscopy, the N2 adsorption/desorption analysis (BET), thermal analysis (TG/DTG), and X-ray diffraction (XRD) techniques.
2385 - 2390
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