in diethyl ether adding N-N'-ligand (30percent excess) to soln./suspension of PtCl(CH3)(Me2S)2 in diethyl ether, stirring (room temp., 6 h); evapg., adding diethyl ether to residue, stirring (6 h), evapg., adding diethyl ether, stirring (6 h), evapg., crystn. (methylen chloride - diethyl ether);

in diethyl ether adding N-N'-ligand (30percent molar excess) and olefin to soln./suspn. of dimethyl sulfide complex in diethyl ether, stirring (15 h, room temp.), pptn.; filtering, drying, recrystn. (methylene chloride - diethyl ether);

in diethyl ether adding N-N'-ligand (30percent molar excess) to soln./suspn. of dimethyl sulfide complex in diethyl ether, stirring under ethylene (atmospheric pressure, 15 h, room temp.), pptn.; filtering, drying, recrystn. (methylene chloride - diethyl ether);

in diethyl ether adding N-N'-ligand (30percent molar excess) to soln./suspn. of dimethyl sulfide complex in diethyl ether, stirring under ethylene (atmospheric pressure, 15 h, room temp.), pptn.; filtering, drying, recrystn. (methylene chloride - diethyl ether);