1: vinyl lithium With copper(I) bromide dimethylsulfide complex; dimethylsulfide in diethyl ether T=-78 - -60°C; 0.333333 h; 2: 1-Triphenylsilanyl-propynone in diethyl ether T=-78°C; 1 h;

1: Me3SiI / CHCl3 / 0.5 h / Ambient temperature 2: 70 percent / PdCl2(CH3CN)2 / dimethylformamide / 1 h / Ambient temperature View Scheme

in chloroform 1 h; Ambient temperature;