Zhou, Qingqing; Ye, Man; Ma, Wenbao; Li, Difan; Ding, Bingjie; Chen, Manyu; Yao, Yefeng; Gong, Xueqing; Hou, Zhenshan published the artcile< Ionic Liquid Stabilized Niobium Oxoclusters Catalyzing Oxidation of Sulfides with Exceptional Activity>, Quality Control of 699-12-7, the main research area is ionic liquid stabilized niobium oxocluster catalyzing oxidation sulfide activity; hydrogen peroxide; oxidation; oxoclusters; peroxoniobium species; sulfides.
We present here a new class of niobium oxoclusters that are stabilized effectively by carboxylate ionic liquids These functionalized ILs are designated as [TBA][LA], [TBA][PA], and [TBA][HPA] in this work, in which TBA represents tetrabutylammonium and LA, PA, and HPA refer to lactate, propionate, 3-hydroxypropionate anions, resp. The as-synthesized Nb oxoclusters have been characterized by use of elemental anal., NMR, IR, XRD, TGA, HRTEM. It was found that [TBA][LA]-stabilized Nb oxoclusters (Nb-OC@[TBA][LA]) are uniformly dispersed with an average particle size of 2-3 nm and afforded exceptionally high catalytic activity for the selective oxidation of various thioethers. The turnover number with Nb-OC@[TBA][LA] catalyst was over 56 000 at catalyst loading as low as 0.0033 mol % (1 ppm). Meantime, the catalyst also showed the high activity for the epoxidation of olefins and allylic alcs. by using only 0.065 mol % of catalyst (50 ppm). The characterization of 93Nb NMR spectra revealed that the Nb oxoclusters underwent structural transformation in the presence of H2O2 but regenerated to their initial state at the end of the reaction. In particular, the highly dispersed Nb oxoclusters can absorb a large amount of polar organic solvents and thus were swollen greatly, which exhibited “”pseudo”” liquid phase behavior, and enabled the substrate mols. to be highly accessible to the catalytic center of Nb oxocluster units.
Chemistry – A European Journal published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 699-12-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H10OS, Quality Control of 699-12-7.
Referemce:
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