in dichloromethane dropwise addn. of a CH2Cl2 soln. of the ethane to a CH2Cl2 soln. of the Pt complex with stirringreflux, 2 h, pptn.; filtration, washing (cold methanol, twice diethyl ether), drying under reduced pressure, elem. anal.;

in ethanol; dichloromethane; water mixing aq. K2PtCl4 with ligand (in CH2Cl2), EtOH addn., heating (4 h); concn.; elem. anal.;