in water stoich. amts., stirring in dark at room temp. with pH-adjustment to 2.5-3.0 for 2 d and to 5.5-6.0 for further 3 d (pptn.); collection (filtration), washing (0.1 M HCl, water, drying (vac., 60°C, over P2O5);

in diethyl ether; water addn. of 1,2-diamino-1-phenylethane in ether to a soln. of K2(PtCl4) in H2O at 40°C under stirring for 4 h;;