Synthesis of imidazoles promoted by H3PW12O40-amino-functionalized CdFe12O19@SiO2 nanocomposite

Abstract H3PW12O40-amino-functionalized CdFe12O19@SiO2 nanocomposite has been applied as an effective nanocatalyst for the preparation of imidazoles by three-component reactions of benzil, ammonium acetate, and benzaldehydes under solvent-free condition. H3PW12O40-amino-functionalized CdFe12O19@SiO2 nanocomposites has been identified by powder X-ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectroscopy, vibrating sample magnetometer, thermal gravimetric analysis, and Fourier transform infrared spectroscopy. This method provides several benefits including easy work-up, the use solvent-free conditions, the low catalyst loading and the reusability of the catalyst. Recently the use of environmental and green catalysts which can be easily recycled has received significant attention. Besides environmental advantages, such recoverable catalysts can also provide a platform for heterogeneous catalysis, green chemistry, and environmentally benign protocols in the near future. Graphical abstract