Studies on transition-metal oxo- and nitrido-complexes. Part 3. Complexes of osmium tetraoxide with tertiary amines, and their reactions with alkenes

Osmium tetraoxide reacts with multidentate tertiaryamines to give L·2OsO4(L = hexamethylenetetramine, 1,4-diazabicyclo[2.2.2]octane, pyrazine, or 5-methylpyrimidine) and with other amines to give L·OsO4(L = quinuclidine, isoquinoline, phthalazine, or pyridazine). Reactions of these adducts with monoalkenes R give the oxo-osmium(VI) esters L·[OsO2(O2R)](L = hexamethylenetetramine, quinuclidine, isoquinoline, or phthalazine) and L·2[OsO2( O2R)](L = 1,4-diazabicyclo[2.2.2]octane). The structures of these compounds are discussed.