Abstract
AbstractThe core‐shell of Fe3O4@SiO2 modified by epichlorohydrin and 1‐methyl‐imidazole (Fe3O4@SiO2‐EPIM), a new green recyclable nanocatalyst, was designed and prepared. This nanocatalyst was characterized using fourier‐transform infrared spectroscopy (FT‐IR), field‐emission scanning electron microscopy (FESEM), energy‐dispersive X‐ray spectroscopy (EDS), elemental mapping technique, transmission electron microscopy (TEM), X‐ray diffraction (XRD) techniques, thermal gravimetric analysis (TGA), N2 adsorption‐desorption by Brunauer‐Emmet‐Teller (BET) and vibrating sample magnetometer (VSM). The catalytic activity of Fe3O4@SiO2‐EPIM was assessed for synthesis of trisubstituted imidazoles via one‐pot condensation reactions of benzil, aldehyde and ammonium acetate under the optimal reaction condition (PEG 200, 100 °C, 0.02 g catalyst). This nanocatalyst displayed remarkable superiorities, such as environmental friendliness, shorter reaction time, excellent yields, reusability of the catalyst and simple workup procedure.
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