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Magnetic halloysite: an envirmental nanocatalyst for the synthesis of benzoimidazoles
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1  Catalysts and Organic Synthesis Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 1684613114, Iran


A great amount of clay minerals are existed in soils and weathered rocks that encompasses unique properties and wide applications due to their nanoscale structures. Because of being biocompatible and cheap in nature, halloysite has been considered a new generation of nanostructures in material science and technology. Halloysite has a structural formula of Al2(OH)4Si2O5.nH2O and Nanocomposites based on halloysite are applied extensively in several industrial and manufacturing processes. High surface area of halloysite is leading to be a good host for immobilizing metals to enhance their catalytic activity.  Magnetic nanocomposite based on Fe3O4 possesses unique features such as low cost, easy preparation, environmental compatibility. As a result of the above cited remarkable properties of heterogeneous Fe3O4@halloysite nanocatalyst and due to the importance of benzoimidazole scaffold, we represent an efficient synthesis of benzoimidazole derivatives via a green one-pot reaction using magnetic nanoclay as catalyst at room temperature in a green solvent.

Keywords: Green chemistry, Heterogeneous catalyst, Magnetic nanocatalyst, Clay, Halloysite, Benzoimidazole.