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Mono-transition-metal-substitutedphosphomolybdates, PMo11M (M = Co, Mn, Ni), were synthesizedand characterized by various physicochemical techniques. They wereefficiently used for liquid-phase nonsolvent oxidation of styreneunder mild reaction conditions. It was found that all of the catalystsare efficient in achieving higher conversions with high turnover numbersand are selective toward benzaldehyde. A detailed kinetic study wasalso carried out. Although all of the catalysts are homogeneous underthe present oxidation conditions, they were regenerated and reusedfor up to two cycles. [ABSTRACT FROM AUTHOR]

1-Phenyl-3-methyl-4-touloyl-5-pyrazolone (ligand) was synthesized and used to prepare an oxovanadium(IV) complex. The complex was characterized by single-crystal X-ray analysis and various spectroscopic techniques. The single-crystal X-ray analysis of the complex shows that the ligands are coordinated in a syn configuration to each other and create a distorted octahedral environment around the metal ion. A heterogeneous catalyst comprising an oxovanadium(IV) complex and hydrous zirconia was synthesized, characterized by various physicochemical techniques, and successfully used for the solvent-free oxidation of styrene. The influence of the reaction parameters (percent loading, molar ratio of the substrate to H2O2, amount of catalyst, and reaction time) was studied. The catalyst was reused three times without any significant loss in the catalytic activity. [ABSTRACT FROM AUTHOR]

A novel heterogeneous catalyst comprising undecamolybdophosphate and hydrous zirconia was synthesized, characterized by various physicochemical techniques and used as an efficient heterogeneous catalyst for oxidation of styrene using H2O2as an oxidant. The novelty of the present work lies in obtaining >99% conversion of styrene with >99% selectivity for benzaldehyde under solvent free mild reaction conditions. [ABSTRACT FROM AUTHOR]