in methanol equimol., refluxed in dry methanol for 4 h; chromy. (SiO2); elem. anal.;

in water K2PtCl4 was added to aq. cis-(Pt(Me2SO)2Cl2), mixt. was heated until all the solid was dissolved; soln. was filtered, evapd. under vac. at room temp., few hours in the disiccator;

in dimethyl sulfoxide 70°C, 24 h; elem. anal.;