dimethylboron bromide in dichloromethane; 1,2-dichloro-ethane T=-78°C; 1 h; diphenylboron bromide instead of dimethylboron bromide;

dimethylboron bromide; triethylamine 1) CH2Cl2, 1,2-dichloroethane, 1h, -78 deg C, 2) RT, 1h; Yield given. Multistep reaction. Yields of byproduct given;

iron(III) chloride in 1,2-dichloro-ethane T=25°C; 18 h;