Abstract

Pallavi D. Shelke^{1, 2}, Anjali S. Rajbhoj^2*, Madhav S. Nimase¹, Gangaram A. Tikone¹, Bhaskar H. Zaware¹ and Shridhar S. Jadhav¹

DOI : http://dx.doi.org/10.13005/ojc/320427

γ-Alumina nano particles (γ-Al₂O₃ NPs) have been successfully synthesized by electro chemical reduction method. The aqueous solution of tetra propyl ammonium bromide was used as an electrolyte cum stabilizer. To prevent spontaneous agglomeration and control nano particles size various parameter such as current density, distance between electrodes and concentrations of electrolyte are optimized. γ-Al₂O₃ NPs thus synthesized were characterized by sophisticated analytical techniques including X-ray diffraction, scanning electron microscopy, energy dispersive spectro photometerand high- resolution transmission electron microscopy. These synthesized γ-Al₂O₃ NPs were tested used as a catalyst for one pot synthesis of tetraaryl imidazole derivatives from the cyclo dehydration and condensation of benzil, aromatic aldehyde, anilines and ammonium acetate under solvent free condition.This method has various advantages like convenient work-up procedure, environmentally benign and less reaction times along with excellent yields. Easy availability, several times recyclability, very simple isolation and eco-friendliness were some attractive features of the nano crystallineγ-Al₂O₃catalyst.

nano crystalline γ-alumina; electrochemical reduction method; heterogeneous catalyst; tetraaryl imidazole; solvent free

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