[OH-].[K+].[F:3][C:4]1[CH:11]=[CH:10][C:7]([CH:8]=O)=[CH:6][CH:5]=1.[CH:12]([C:15]([CH3:17])=[O:16])([CH3:14])[CH3:13].C(O)(=O)C>CO.O>[F:3][C:4]1[CH:11]=[CH:10][C:7]([CH:8]=[CH:17][C:15](=[O:16])[CH:12]([CH3:14])[CH3:13])=[CH:6][CH:5]=175 ml of 15% strength potassium hydroxide solution are added dropwise to 198.4 g (1.6 mol) of freshly distilled 4-fluorobenzaldehyde and 137.6 g (1.6 mol) of methyl isopropyl ketone in 300 ml of methanol and stirred overnight at room temperature. The mixture is then neutralized using 10 ml of acetic acid, 1 l of water is added and the mixture is extracted with two 500 ml portions of ether. The combined organic phases are washed with 500 ml of saturated sodium chloride solution and dried over sodium sulphate. After removing the solvent, the residue is distilled under high vacuum.
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