copper dichloride in tetrahydrofuran T=25 - 50°C; 4 h;

1: 2-methoxybromobenzene With n-butyllithium in diethyl ether; hexane T=0°C; 2 h; 2: chlorodi-tert-butylphosphine in diethyl ether; hexane T=0 - 20°C;

boron tribromide in dichloromethane T=-78 - 20°C;