Synthesis of Fe3o4/Eggshell Nanocomposite and Application For Preparation of Tetrahydrobenzo[B]Pyran Derivatives

This work is reported on the synthesis of fe3o4/eggshell nanocomposites in the absence of any stabilizer or surfactant.fe3o4 magnetic nanoparticles were established on the egg shell nano-composite. the nanocompositeshave shown high catalytic activities in the synthesis of tetrahydrobenzo[b]pyran. these derivatives were synthesized via an one‐pot three‐component condensation of aromatic aldehydes with malononitrile and dimedonewith excellent yields in the presence of fe3o4/eggshell nanocomposites as a highly efficient heterogeneous catalyst. the obtained catalyst was characterized by fourier transform infrared spectroscopy (ft-ir), field emission scanning electron microscopy (fe-sem), x-ray diffraction analysis (xrd) and vibrating sample magnetometer (vsm). the developed technique of nano-composite synthesis is energy efficient since the reactions carried out in single step. the present catalyst is possible to be used for the production of biodiesel.