[F:1][C:2]([F:13])([F:12])[C:3]1[C:4]([C:9](=[O:11])[CH3:10])=[N:5][CH:6]=[CH:7][CH:8]=1.[Br:14]Br>Br>[Br:14][CH2:10][C:9]([C:4]1[C:3]([C:2]([F:1])([F:12])[F:13])=[CH:8][CH:7]=[CH:6][N:5]=1)=[O:11].[BrH:14]Dissolve 1-(3-trifluoromethyl-pyridin-2-yl)-ethanone (2.10 g, 11.1 mmol) in HBr (30% by wt in AcOH) (14 mL). Cool the mixture to 0° C. and add bromine (0.62 mL) drop wise. Allow the resulting solution to warm to room temperature and stir for 3 hours. Concentrate the reaction under reduced pressure to yield the title compound as its HBr salt.
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