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MgFe2O4 nanoparticle ferrites were synthesized by combustion technique using pure ferric nitrate and magnesium carbonate. The magnetically separable MgFe2O4 MNP’s were found to be hyper active catalyst for the synthesis of a wide range of biologically active five and six-membered heterocyclic moieties at refluxing conditions. Reaction times are lowest in comparison to all reported in literature with excellent yields. Strong electron pull of Fe is responsible for its hyper activity, which has been substantiated by substitution of Fe by other trivalent metal ions. Mg has a unique role because replacement of Mg has poor catalytic activity. The developed protocol has been efficiently utilized for the synthesis of a series of substituted mono/bis pyrimidines, pyrimidin-2-ol, pyrimidin-2-thiol, pyrazoles and isoxazoles by condensing monochalcones/1,4-bischalcones with various bis-nucleophiles in the presence of catalytic amount of heterogenous magnetic MgFe2O4 nanoparticles. The structure of these synthesized compounds was determined by FTIR, H, C and mass spectra. The catalyst can be removed easily from reaction mixture by using a simple external magnet. Nanoparticles of ferrite were recovered and reused with no appreciable change in the activity even after the five runs. Nanoparticles are characterized by XRD, TEM and IR spectroscopy.

Hyperactive Magnetically Separable Nano-sized MgFe2O4 Catalyst for the Synthesis of Several Five- and Six-Membered Heterocycles