Abstract
Fe3O4@SiO2@(CH2)3-urea-thiourea as a new hydrogen-bonding and retrievable nanomagnetic catalyst was fabricated and its structure confirmed by transmission electron microscopy (TEM), thermogravimetric analysis/ derivative thermogravimetric (TGA/DTG), vibrating sample magnetometer (VSM), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and elemental mapping analysis. The catalytic performance of the novel hydrogen-bonding catalyst was appropriately probed through the multicomponent preparation of bipyridine-5-carbonitriles via a cooperative vinylogous anomeric based oxidation (CVABO) mechanism in the absence of any solvent. The novel hydrogen-bonding nanomagnetic catalyst can readily be regained and reused four times without appreciable destruction of catalytic efficiency.
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