[Cl:1][C:2]1[CH:3]=[C:4]([OH:8])[CH:5]=[CH:6][CH:7]=1.F[C:10]1[CH:17]=[CH:16][C:13]([CH:14]=[O:15])=[CH:12][CH:11]=1.[H-].[Na+]>CN(C)C=O.O>[Cl:1][C:2]1[CH:3]=[C:4]([CH:5]=[CH:6][CH:7]=1)[O:8][C:10]1[CH:17]=[CH:16][C:13]([CH:14]=[O:15])=[CH:12][CH:11]=13-Chlorophenol (1.9 g) was stirred with 4-fluoro-benzaldehyde (1.8 g) and sodium hydride (0.46 g of an 80% suspension in oil) in dimethylformamide (50 ml) at 110° C. under an atmosphere of nitrogen for 16 hours. The solution was diluted with water and extracted with diethyl ether. The ethereal extract was dried (Na2SO4), concentrated and purified by chromatography on silica gel eluting with ethyl acetate-petroleum ether (1:9) to give the title compound as a colourless oil.
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