chloro-trimethyl-silane; ethylene dibromide; zinc in N,N-dimethyl-formamide T=20°C; Inert atmosphereHeating;

in N,N-dimethyl-formamide

in N,N-dimethyl-formamide byproducts: ZnBr2; N2; slight excess of Zn powder added to olefin soln.; mild exotherm reactn. after short induction period; unsepd. prod. mixt. in ratio mono/bis = 67/33; removal of excess Zn by filtrn.;

tetrakis(triphenylphosphine) palladium(0) in N,N-dimethyl-formamide T=20°C; 12 h; Inert atmosphere;

tetrakis(triphenylphosphine) palladium(0) in N,N-dimethyl-formamide T=70°C; 6 h;

tetrakis(triphenylphosphine) palladium(0) in N,N-dimethyl-formamide T=60 - 75°C;