Synthesis  and Characterization of Tungsten (VI)Complex with Oxazine Ligand and its Catalytic Application in Oxidation of Sulfides to Sulfoxides

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Esmailpour Firoozsalary, Parvin | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47826 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Bagherzadeh, Mojtaba
Abstract:
In this study a novel oxo-diperoxo tungsten(VI) complex [WO(O2)2(phox)] was prepared by reaction of WO3 in H2O2 with oxazine-type ligand, 2-(2′-hydroxyphenyl)-5,6-dihydro-1,3-oxazine (Hphox). The complex was characterized by FTIR, 1H NMR and elemental analysis. The single-crystal X-ray diffraction studies revealed a seven coordinate tungsten center with a distorted octahedral geometry. The [WO(O2)2(phox)] complex was applied as a catalyst in efficient, and selective oxidation of sulfide to sulfoxide using 30% H2O2 or UHP as oxidants. This catalyst showed excellent catalytic activities and high selectivities in producing a variety of aryl and alkyl sulfoxides under mild conditions. To get an insight into the mechanisms of oxidation of sulfides, the kinetic studies have been monitored by UV-Vis Spectroscopy
Keywords:
Sulfoxides ; Oxazine ; Sulfide Oxidation ; Catalytic Activity ; Oxodiperoxo Tungsten Complex

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