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Epoxidation of a range of alkenes with aqueous H2O2 easily proceeds in the presence of the dititanium‐containing 19‐tungstodiarsenate(III) [Ti2(OH)2As2W19O67(H2O)]8– (1), which contains five‐coordinate Ti atoms. The results of product and kinetics studies support a mechanism that involves a reversible interaction between H2O2 and the Ti–OH group of 1 to produce a titanium hydroperoxo complex followed...
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