The Synthesis and X-ray Crystal Structures of Homoleptic Tetrahedral Aryls of Osmium(IV) and of Cyclohexyls of Ruthenium(IV), Osmium(IV), and Chromium(IV)

The interaction of o-tolylmagnesium bromide or AlPh3(OEt2) with osmium tetraoxide leads to the isolation of the homoleptic, tetrahedral osmium(IV) compounds OsR4 (R = C6H4Me-o or C6H5). Thermally stable M (C6H11)4 compounds (M = Ru, Os, or Cr; C6H11 = cyclohexyl) are obtained by the interaction of the Grignard reagent with Ru2(O2CMe)4Cl, Os2(O2CMe)4Cl2, and CrCl3(thf)3 (thf = tetrahydrofuran) respectively. The structures of all five compounds have been determined by X-ray crystallography