zinc(II) chloride in tetrahydrofuran T=-70°C; 1 h;

1: ethylmagnesium bromide With zinc(II) chloride in tetrahydrofuran transmetallation; 2: in tetrahydrofuran T=-10°C; transmetallation; 3: 1-bromo-3-phenylallene in tetrahydrofuran T=-70°C; cross-coupling reaction; 1 h;

Br2Cu(1-)*Li(1+) 1.) THF, 0 deg C, 30 min 2.) THF, from - 60 deg C to rt, 40 min; Yield given. Multistep reaction. Yields of byproduct given;

Br2Cu(1-)*Li(1+) 1.) THF, 0 deg C, 30 min 2.) THF, from -70 deg C to rt, 40 min; Yield given. Multistep reaction. Yields of byproduct given;

in tetrahydrofuran 0.5 h; from -70 deg C to room temperature; Yield given;