Osmium complexes imides

Diarylacetylenes are converted in 55-90% yields into a-diketones by refluxing for 2-7 h with thallium trinitrate in glyme solutions containing perchloric acid [413. Other oxidants capable of achieving the same oxidation are ozone [84], selenium dioxide [509], zinc dichromate [660], molybdenum peroxo complex with HMPA [534], potassium permanganate in buffered solutions [848, 856, 864,1117], zinc permanganate [898], osmium tetroxide with potassium chlorate [717], ruthenium tetroxide and sodium hypochlorite or periodate [938], dimethyl sulfoxide and iV-bromosuccin-imide [997], and iodosobenzene in the presence of a ruthenium catalyst [787] (equation 143). 

The reaction of PhINTs with complexes of ruthenium(II) [800], osmium(II) [850,851] and cobalt(III)[852] results in imidation at the metal center with the formation of the respective tosylimido-metal complexes. X-Ray structures have been determined for several bis(tosylimido)ruthenium(VI) and bis(tosylimido)-osmium(VI) porphyrin complexes [800, 850, 851]. 

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