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The condensation reaction of 1,2-bis(2 0 -aminophenoxy)benzene with 2pyridinecarbaldehyde in a mole ratio of 1:2 gives a new Schiff base ligand (L). Four Schiff base complexes, CoL(NO 3 ) 2 (1), NiLCl 2 (2), ZnL(NO 3 ) 2 (3) and Pd 2 LCl 4 (4) have been prepared by direct reaction of the ligand (L) and appropriate metal salts. The Schiff base ligand (L) has been characterized by IR, 1 H NMR and 13 C NMR spectroscopy and elemental analysis. Also, all complexes have been characterized by IR and XRD spectroscopy techniques and elemental analysis. The synthesized complexes have very poor solubility in all polar and non-polar solvents such as: H 2 O, MeOH, EtOH, CH 3 CN, DMSO, DMF, CHCl 3 , CH 2 Cl 2 , THF, etc; therefore, they have been used as heterogeneous catalysts. Catalytic performance of the complexes was studied in oxidation of thioanisole using hydrogen peroxide (H 2 O 2 ) as the oxidant. Various factors including the reaction temperature, amount of oxidant and catalyst amount were optimized. The palladium Schiff base complex, Pd 2 LCl 4 (4), shows better catalytic activity than other complexes. Therefore, the Pd(II) Schiff base complex has been used as a catalyst for oxidation of different sulfides to their corresponding sulfones in acetonitrile with hydrogen peroxide as the oxidant. The palladium Schiff base complex, Pd 2 LCl 4 (4), has shown a very good recyclability, up to five times, without any appreciable decreases in catalytic activity and selectivity.

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In this study, we document the use of a reusable magnetic nanoparticle (MNP)-supported copper catalyst for the efficient synthesis of propargylamines via the A 3 coupling of benzaldehydes, phenylacetylene, and piperidine or morpholine. The new MNPs were characterized by scanning electron microscopy, energy dispersive X-ray analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and vibrating sample magnetometry. Notably, the activity and leaching test of the catalyst indicated that the MNPs could be reused without loss to its catalytic activity or leaching of its copper ligands.