Abstract
An excellent catalytic epoxidation system containing [π-C5H5N(CH2)15CH3]3[PW4O32]/H2O2/ethyl acetate/olefin has been prepared and shown to exhibit a unique reaction-controlled phase transfer behavior. The composition and structural changes of the catalyst [π-C5H5N(CH2)15CH3]3[PW4O32] (I) before, during and after reaction were investigated by 31P NMR, 31P MAS NMR, 183W NMR, IR, Raman and UV–Vis spectroscopy. The 31P MAS NMR and 31P NMR confirmed that the original catalyst was a mixture of heteropoly tungstophosphates. According to the 31P NMR and 183W NMR analysis, new phosphoperoxotungstate species, [PWxOy]z−, were produced in this catalytic system instead of the well known species of {PO4[WO(O2)2]4}3−. The active species of phosphoperoxotungstate containing many peroxo bonds should be similar to [(PO4){WO(O2)2}4]3−. The species degraded from H3PW12O40, H2O2 and quaternary ammonium were very complicated and the compositions were mainly dependent on the ratio of H2O2 to H3PW12O40.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 20803032) and the Natural Science Foundation of Nanyang Normal University (No. ZX2012012). The authors gratefully thank Prof. W. Wang for the measurement of solid state NMR, GC and his valuable discussions.
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Zhao, W., Ding, Y. A kinetic and spectroscopic study on the polyoxometalate species in a reaction-controlled phase transfer catalytic epoxidation system. Reac Kinet Mech Cat 109, 509–524 (2013). https://doi.org/10.1007/s11144-013-0565-2
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DOI: https://doi.org/10.1007/s11144-013-0565-2