HCl; N2 in water to hot deaerated soln. of K2PtCl4 in H2O added dropwise soln. of the organic compound in H2O with few drops of HCl, N2 bubbled through soln., stirred and heated for 3 h, cooled; filtered, dissolved in CHCl3, filtered, slow evapd., elem. anal.;

in water the organic compound added to soln. of K2PtCl4 in water, mixture stirred at 35-40°C for 5 days; mixture filtered, residue collected in a filter, extracted from residueby stirring in the absence of heat in CHCl3 (8 h), mixture filtered, filtrate evapd., crystals washed several times with CHCl3;