1: m-C6H4BrBCl2 With i -Pr2Zn in diethyl ether T=25°C; 2 h; 2: in tetrahydrofuran T=-30°C; 0.166667 h; 3: allyl bromide in tetrahydrofuran T=20°C; Further stages.;

1: m-C6H4BrBCl2 With i -Pr2Zn in diethyl ether T=25°C; 2 h; 2: in tetrahydrofuran T=-30°C; 0.166667 h; 3: propargyl bromide in tetrahydrofuran T=20°C; Further stages.;

With  bromine in  dichloromethane  slow addn. of Br2 in CH2Cl2 to dichlorophenylborane in CH2Cl2 (under N2or Ar) at 0°C and stirring at room temp. for 12 h; evapn. and distn. (vac.);