in diethyl ether evapn., heating at 150°C, fractionating in high vac.;

in dichloromethane (N2 atm.; Schlenk) Sb(CH3)2C6H5 in CH2Cl2 was added to Os-complex, the mixt. was stirred at 60°C for 6 h; silica gel was added, the solvent was removed in vac., followed by column chromy.; elem. anal.;