in ammonia byproducts: NH4Cl; NH3 (liquid); addn. of Se-compd. to Pt-complex in NH3 (-78°C), stirring (1 h), warming to room temp., NH3 evaporating off; extn. (CH2Cl2), crystn. (CH2Cl2/petrol ether); elem. anal.;

NH3 in ammonia NH3 (liquid); inert atmosphere;

in diethyl ether; dichloromethane The mixt. of reagents in CH2Cl2-Et2O was heated under reflux for 4 h orstirred for 36 h at room temp. (N2 atm.);; evapd., chromd. by preparative TLC; elem. anal.;;

in acetone under inert gas; dropwise addn. of p-MeOC6H4NC in acetone to a suspn. of the Pt complex in the presence of NaBF4 at room temp.; stirring for 1 h; solvent removed, residue dissolved in CH2Cl2; soln. filtered and concd., addn. of Et2O yields the solid;