Abstract
Magnetite nanoparticle-supported ionic liquid (IL@Fe3O4) catalysts with varying anions were synthesized via step-wise functionalization of Fe3O4 nanoparticles. They were characterized through various analytical techniques like X-ray diffraction, transmission electron microscopy, thermal gravimetric analysis, Fourier-transform infrared spectroscopy, and energy-dispersive X-ray. Catalytic efficiency of the synthesized catalysts was evaluated through their utilization in the synthesis of biologically active substituted quinoline and fused polycyclic quinoline derivatives. The effect of varying anion on acidity of the catalyst was discussed and the mechanism has been proposed. The IL-1@Fe3O4 with acetate ion was found as a potential catalyst for the Friedlander reaction and gave excellent isolated yield of the targeted products under mild reaction condition. Facile catalyst separation through external magnet and its reusability up to six reaction cycles made the process environmentally benign.
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