KHF2; dihydrogen peroxide in acetic anhydride; N,N-dimethyl-formamide 20 h; Ambient temperature; Yield given;

1: monomethyldichlorosilane; 3,3-dimethylbut-1-yne With (.eta.5-C5Me5)RuH3(PPh3) in toluene T=80°C; 2: ethanol With triethylamine in dichloromethane; toluene T=0°C; Further stages.;

dihydrogen hexachloroplatinate in isopropyl alcohol 0.5 h; Ambient temperature;