[Br:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([CH3:9])=[C:4]([Cl:10])[CH:3]=1.[Br:11]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>C(Cl)(Cl)(Cl)Cl.CCCCCCC>[Br:1][C:2]1[CH:3]=[C:4]([Cl:10])[C:5]([CH2:9][Br:11])=[CH:6][C:7]=1[F:8]A solution of 4-bromo-2-chloro-5-fluorotoluene (997 mg, 4.46 mmol), N-bromosuccinimide (837 mg, 4.70 mmol) and benzoyl peroxide (35 mg, 0.14 mmol) in carbon tetrachloride (20 mL) was heated to reflux at 85° C. for 18.5 hours under nitrogen. The reaction mixture was concentrated in vacuo to afford a cream solid residue. The residue was suspended in heptane (40 mL), filtered and the filtrate then concentrated in vacuo to afford the title compound a clear oil (1.35 g, 100%). The compound was used without further purification in the next step.
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