Catalysis Letters

, Volume 142, Issue 8, pp 1020–1025 | Cite as

Multiple Oxo-Vanadium Schiff Base Containing Cyclotriphosphazene as a Robust Heterogeneous Catalyst for Regioselective Oxidation of Naphthols and Phenols to Quinones



Grafting of multiple oxo-vanadium Schiff base moieties to cyclotriphosphazene provided an efficient and recyclable heterogeneous catalyst for the regioselective oxidation of naphthols and phenols to quinones by using t-butylhydroperoxide as oxidant. One of the main advantages of the developed catalyst was the presence of multiple oxo-vanadium moieties in close proximity which made the developed catalyst more active as compared to its homogeneous oxo-vanadium Schiff base. After the reaction, the catalyst was easily recovered from the reaction mixture by simple filtration and reused for five runs without loss in activity.

Graphical Abstract


Cyclotriphosphazene Vanadium Oxidation Naphthol Quinone 



We thank Director, IIP for his kind permission to publish these results. We thank Analytical Sciences Division, IIP for IR, elemental analysis and Dr. JK Gupta for TGA analysis.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Chemical Sciences DivisionCSIR-Indian Institute of PetroleumDehradunIndia

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