Epoxides are an important class of industrial chems. that have been used as chem. intermediates. Catalytic epoxidn. of olefins affords an interesting prodn. technol. We found a widely usable green route to the prodn. of epoxides: A silicotungstate compd., [ﾎｳ-SiW10O34(H2O)2]4-, is synthesized by protonation of a divacant, lacunary, Keggin-type polyoxometalate of [ﾎｳ-SiW10O36]8- and exhibits high catalytic performance for the epoxidn. of various olefins, including propylene, with a hydrogen peroxide (H2O2) oxidant at 305 K. The effectiveness of this catalyst is evidenced by 竕･99% selectivity to epoxide, 竕･99% efficiency of H2O2 utilization, high stereospecificity, and easy recovery of the catalyst from the homogeneous reaction mixt. [on SciFinder(R)]
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