in diethyl ether; dichloromethane Addn. of AgClO4 to a CH2Cl2 soln. of Pt-complex (molar ratio 1:1) and stirring of mixt. (exclusion of light, room temp., 1 h).; Evapn. of soln. to dryness and treatment of resulting oily residue with O(C2H5)2 to separate the insoluble org. compd. Evapn. of ether soln. to dryness gives a solid.;

in dichloromethane Addn. of O3ClOAgPPh3 to a soln. of Pt-compd. (CH2Cl2, -30°C) and stirring of mixt. (30 min, -30°C, exclusion of light).; Pumping of soln. to dryness (-30°C) and treatment of residue with O(C2H5)2 (-30°C). Evapn. of soln. to dryness and addn. of n-hexane after sepn. of insoluble NBu4ClO4.;