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A −78° C. solution of the crude 2-phenoxy-5-trifluoromethyl-anisole (3.79 g, 14.1 mmol) in CH2Cl2 (38 mL) is treated with BBr3 (14.04 g, 56.1 mmol) and then warmed to 0° C. The mixture is stirred for 1.5 h under N2, poured into ice water and extracted with Et2O. The organic layer is dried (Na2SO4), and the solvent is removed in vacuo to afford crude material that is absorbed on silica gel and columned with 6/1 hexanes/ethyl acetate to afford 1.29 g (18%) of the title compound. 1H NMR (400 MHz, CDCl3); MS (ES−+) m/z mass calculated for C13H9O2F3 254, found 253 (M+1, 100%).

1. extractionextracted with Et2O
2. dry with materialThe organic layer is dried (Na2SO4)
3. customthe solvent is removed in vacuo
4. customto afford crude material that
5. customis absorbed on silica gel