Magnetite-supported salicylic acid (Fe3O4@SA) as a magnetically separable and reusable catalyst for the synthesis of 3, 4 dihydropyrimidin-2(1H)-ones/thiones and benzylidenemalononitrile derivatives under solvent-free conditions

The use of the new Fe3O4@Salicylic acid nanocatalyst (Fe3O4@SA) is described in the synthe-sis of 3, 4 dihydropyrimidin-2(1H)-ones/thiones and benzylidenemalononitrile in a solvent-free(SF) environment at 80◦C as a simple, effective, and environmentally friendly procedure. In thepresent protocol, we have created new, simple chemical co-precipitation method for the synthesisof efficient and magnetically recoverable Fe3O4magnetic nanoparticles (MNPs) coated with alayer of salicylic acid. The synthesized catalyst underwent thorough characterization successfullyby Infrared spectroscopy, Powder X-ray diffraction (XRD), Field emission scanning electronmicroscopy (FESEM), Transmission electron microscopy (TEM), and FESEM-energy-dispersiveX-ray spectroscopy, Thermogravimetric analysis (TGA), Vibrating sample magnetometer (VSM)respectively. This eco-friendly and green synthesis methodology has advantages, such as the ab-sence of hazardous organic solvents, magnetic in nature, salicylic acid coated ferrite nanocatalystsare easily separable and reusable, quick reaction time and large product yield(71-98%), makingthis protocol superior and robust.