in dichloromethane with exclusion of light, molar ratio of starting materials is 1:1, room temp., 5 min; evapn. to dryness, treated with Et2O, filtration, evapn. to dryness, washeed with hexane, dried in vac.;

in dichloromethane with exclusion of light, molar ratio of starting materials is 1:1, 1h stirring at 0°C, evapn. to dryness, treated with Et2O, filtered; residue (Bu4NClO4 and Pt-compd.) washed with i-PrOH, elem. anal.;

in dichloromethane