[OH-].[Na+].[CH:3](=O)[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[F:11][C:12]1[CH:17]=[CH:16][C:15]([CH2:18][CH:19]=[O:20])=[CH:14][CH:13]=1>O.CO>[F:11][C:12]1[CH:17]=[CH:16][C:15](/[C:18](=[CH:3]/[C:4]2[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=2)/[CH:19]=[O:20])=[CH:14][CH:13]=14.2 g of sodium hydroxide in 30 ml of water are added to a solution of 26.5 g of benzaldehyde in 300 ml of methanol. The reaction mixture is cooled to 10° C., and 36 g of 4-fluorophenylacetaldehyde are rapidly added, during which the solution rises to 30°-40° C. The reaction solution is stirred at 40° C. for 10 hours and then cooled and the crystals which have separated out are filtered off with suction. 31.6 g (56%) of E/Z-2-(4-fluorophenyl)-3-phenylpropenal of melting point 87°-94° C. are obtained.
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