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8383022 
Book/Book Chapter 
Catalysis using oxovanadium(IV) complexes of 4-acylpyrazolone ligand 
Parihar, S; Jadeja, RN 
2014 
Nova Science Publishers, Inc. 
Advances in Chemistry Research 
22 
217-229 
English 
The interest in the coordination chemistry and catalytic activity of oxovanadium(IV) complexes of 4-acylpyrazolones has increased greatly in recent years. However, at the beginning of this time, only a minor amount of research was being done on catalysis using these complexes. This chapter includes discussion on the geometries and catalytic activities of the oxovanadium(IV) complexes of 4-acylpyrazolone. The single crystal XRD proven to be a powerful technique for the study of coordination geometry of oxovanadium(IV) complexes with 4-acylpyrazolone ligands. The single-crystal XRD analysis of the complexes reveals that the ligands coordinate with a vanadium atom to create an octahedral geometry and two O, O-chelating acylpyrazolonate ligands constitute two six-member rings with the vanadium. These complexes can exist in syn, anti and twisted coordination geometries. The catalytic activities of these complexes have been studied for the oxidation of styrene and benzylic alcohols. The complexes were immobilized over a solid support (ZrO2/ SBA-15) and used as heterogeneous catalyst for the selective oxidation of styrene to benzaldehyde using H2O2 as an oxidant. The use of these complexes as homogeneous catalyst for the oxidation of styrene has also been reported. The oxidation of benzyl alcohol and a wide array of electronically diverse substituted benzyl alcohols were carried out using these complexes as homogeneous catalysts with H2O2. The results elucidate that the oxovanadium(IV) complexes of 4- acylpyrazolone ligands are efficient heterogeneous as well as homogeneous catalysts for the selective oxidation of styrene and benzylic alcohols to their corresponding benzaldehydes. © 2014 by Nova Science Publishers, Inc. All rights reserved.