Hoveyda-Grubbs catalyst second generation; magnesium chloride in water; tert-butyl alcohol 3.5 h;

in pentane T=37°C; Irradiation; Yield given. Yields of byproduct given;

2,6-dichloro-benzonitrile; bromine; 3-chloro-benzenecarboperoxoic acid 1.) CH2Cl2, room temperature, overnight, 2.) CH2Cl2, 12 h, 3.) THF, room temperature, 4 h; Yield given. Multistep reaction. Yields of byproduct given;

in pentane T=37°C; Irradiation; Yield given. Yields of byproduct given;

bromine in dichloromethane Ambient temperature; Title compound not separated from byproducts;