Immobilization of Mn(II) on Fe3O4@Schiff base as an efficient and recoverable magnetic nanocatalyst for the synthesis of hydroquinolines and Hantzsch reaction

A facile process for the efficient synthesis of a new catalyst is reported by immobilization of Mn(II) on Fe3O4@Schiff base. This catalyst is applied for the synthesis of Hantzsch hydroquinoline derivatives. Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction and transmission electron microscopy analysis were used for the characterization of the as-synthesized catalyst. The products of Hantzsch reaction were characterized using H-1-NMR and FT-IR spectroscopies. Owing to its good magnetic property confirmed by vibrating sample magnetometer analysis, the as-prepared catalyst can be extracted from the reaction mixture easily and apply in the next catalytic cycle. In comparison to the same reactions, this method exhibits the advantages of short reaction times, higher yields, low catalyst loading, easy catalyst separation, catalyst reusability and low cost. Graphic abstract