Synthesis of 2,4,5-triaryl-1H-imidazoles using a potent, green and reusable nano catalyst (FHS/SiO2)

محورهای موضوعی : Iranian Journal of Catalysis

Mehdi Bakavoli ¹ (Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.)
Hossein Eshghi ² (Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.)
Ali Mohammadi ³ (Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.)
Hassanali Moradi ⁴ (Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.)
Javad Ebrahimi ⁵ (Young Researchers Club, Islamic Azad University, Mashhad Branch)

تاریخ دریافت : 1393/08/21 تاریخ پذیرش : 1393/10/25 تاریخ انتشار : 1394/06/10

کلید واژه: Heterogeneous catalyst, Nano Catalyst, 2, 4, 5-Trisubstituted imidazoles, Solvent-free synthesis, Ferric hydrogen sulfate,

چکیده مقاله :

A simple, green and efficient method for synthesis of 2,4,5-trisubstituted imidazoles is described via three-component cyclocondensation of benzil or benzoin, aldehyde and ammonium acetate by using the nano SiO2-supported ferric hydrogen sulfate (FHS/SiO2), as a catalyst, under solvent-free conditions. The nano SiO2 support and catalyst were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and IR spectroscopy. In this project, the optimum conditions such as: reaction temperature, reaction time and amount of catalyst were investigated. The major advantages of the present method are high yields, shorter reaction times, easy work-up, purification of products by non-chromatographic method and the reusability of the catalyst.

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