“…Metal oxo complexes have been invoked as models of intermediates in enzymatic oxidation cycles of cytochrome [29] and most of the chromium compounds [30] are oxo derivatives featuring a O=Cr V unit [31,32]. Reactions of such species with twoelectron reductants such as sulfides, sulfites, nitrites, and olefins may proceed by direct transfer of oxo-oxygen from oxochromium(V) species [33][34][35]. A number of studies on the redox chemistry of chromium(V) and the mechanism of oxygenation of inorganic nitrite [24] and vanadium(IV) [36] by oxochromium(V) salen complex, where salen = N ,Nethylenebis (salicylideneimine) in acetonitrile medium, have recently been reported by us.…”