[Br:1][C:2]1[CH:7]=[CH:6][C:5](I)=[CH:4][C:3]=1[C:9]([F:12])([F:11])[F:10].[Li]CCCC.CCCCCC.[CH:24](=[O:31])[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1.Cl>CCOCC.O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH:24]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[OH:31])=[CH:4][C:3]=1[C:9]([F:12])([F:11])[F:10]To a solution of 1-bromo-4-iodo-2-(trifluoromethyl)benzene (246 mg, 0.701 mmol) in 1.4 mL of Et2O (C=0.5M) was added dropwise a 1.6M solution of BuLi in hexane (460 μL, 1.05 eq) at −78° C. After 15 min of stirring, benzaldehyde (86 μL, 1.2 eq) was slowly added. The mixture was stirred for 4 h at −75° C. and then, hydrolyzed with water and with a 1M HCl solution to acidify. The layers were separated. The aqueous layer was extracted with DCM (3×10 mL). The combined organics were washed with brine, dried over MgSO4, filtered and solvents were removed in vacuo. The crude residue was purified by silica gel flash chromatography (cyclohexane/AcOEt 93:7 to 90:10) to afford the desired product in 76% yield (176 mg) as an uncoloured oil. 1H NMR (300 MHz, CDCl3) δ 7.76 (d, J=2.2 Hz, 1H), 7.65 (d, J=8.3 Hz, 1H), 7.41-7.27 (m, 6H), 5.81 (s, 1H), 2.36 (s, OH); 13C NMR (75 MHz, CDCl3) δ 143.5 (C), 142.8 (C), 135.1 (d, J=2.0 Hz, CH), 131.0 (CH), 130.2 (q, J=31.3 Hz, C), 129.0 (CH), 128.5 (CH), 126.7 (CH), 125.9 (q, J=5.4 Hz, CH), 123.0 (q, J=273.6 Hz, C), 118.9 (q, J=2.0 Hz, C), 75.4 (CH); MS (ESI) m/z: 313.0, 315.0 [M-OH, 79Br, 81Br]+; 348.0, 350.0 [M+NH4, 79Br, 81Br]+; 680.0 [2M+NH4, 79Br, 81Br]+.
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