A peroxochromium complex, TpiPr2Cr(O2)2, obtained by oxidative dehydrative condensation between a dihydroxochromium complex and H2O2[TpiPr2= hydrotris(3,5-diisopropylpyrazolyl)borato]

Synthesis of a peroxochromium complex containing the TpiPr2[hydrotris(3,5-diisopropylpyrazolyl)borato] ligand has been attempted by (i) dehydrative condensation between hydroxochromium complexes and H2O2 and (ii) oxidative addition to a Cr(II) species. As a result, a diperoxochromium(V) complex, TpiPr2Cr(O2)2, is obtained by oxidative dehydrative condensation of the dimeric (dihydroxo)(aquo) chromium(III) complex, [TpiPr2Cr(OH)2(OH2)]2, with H2O2, whereas O2-oxidative addition to Cr(II) species affords Cr(III) species or dinuclear TpiPr2Cr species bridged by chromate (CrO4) or dichromate ions (Cr2O7). The preparations of the starting complexes and oxidation reactions by the diperoxo complex are also described.