[F:1][C:2]([F:14])([F:13])[C:3]1[CH:4]=[C:5]([NH:9][CH2:10][CH2:11]O)[CH:6]=[CH:7][CH:8]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(Br)(Br)(Br)[Br:35]>N1C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[Br:35][CH2:11][CH2:10][NH:9][C:5]1[CH:6]=[CH:7][CH:8]=[C:3]([C:2]([F:14])([F:13])[F:1])[CH:4]=1N-(3-trifluoromethylphenyl)ethanolamine (4.17 g) and triphenyl phosphine (5.50 g) were dissolved in dry pyridine (35 ml) and stirred at 0° C. To this solution was added, portionwise, carbon tetrabromide (7.08 g). Stirring was continued for 1 hour and the reaction mixture was left to stand at room temperature overnight. A little more triphenyl phosphine (0.20 g) was added, and when virtually all starting alcohol had been consumed the pyridine was removed under reduced pressure to leave a brown residue (14.10 g). This was chromatographed on silica gel, eluting with ethyl acetate/hexane (1:9) as eluant to give the title compound as a light brown oil, yield 3.35 g.
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