Hybrid Pd/Fe3O4 nanowires: Fabrication, characterization, optical

properties and application as magnetically reusable catalyst for the

synthesis of N-monosubstituted ureas under ligand-free conditions

 

 

Mahmoud Nasrollahzadeh*,a Abbas Azarian,b Ali Ehsani,a S. Mohammad Sajadic and Ferydon Babaeib

 

aDepartment of Chemistry, Faculty of Science, University of Qom, Qom 37185-359, Iran

bDepartment of Physics, University of Qom, Qom, Iran

cDepartment of Petroleum Geoscience, Faculty of Science, Soran University, PO Box 624, Soran, Kurdistan

Regional Government, Iraq


 

ABSTRACT

This paper reports the synthesis and use of Pd/Fe3O4 nanowires, as magnetically separable catalysts for ligand-free amidation coupling reactions of aryl halides with benzylurea under microwave irradiation. Then, the in Situ hydrogenolysis of the products was performed to afford the N-monosubstituted ureas in good to excellent yields. This method has the advantages of high yields, simple methodology and easy work up. The catalyst can be recovered by using a magnet and reused several times without significant loss of its catalytic activity. The catalyst was characterized using the powder XRD, SEM, EDS and UV-Vis spectroscopy. Experimental absorbance spectra compared with results from the Gans theory.