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To a mixture of 2,4-difluorobenzaldehyde (5.0 ml, 45.7 mmol) and acetone (10.75 ml, 146 mmol) in Water (10 ml), was added 0.25M sodium hydroxide (18.30 ml, 4.57 mmol). The reaction mixture was heated to for 2 h. The mixture was poured into ice water. It was extracted with ethyl acetate (200 ml). The organic layer was dried, filtered, and evaporated to give (E)-4-(2,4-difluorophenyl)but-3-en-2-one as yellow oil. It was used for the next reaction without purification. 1H NMR (CDCl3/400 MHz): δ (ppm) 7.60 (d, 1H), 7.60-7.53 (m, 1H), 6.96-6.86 (m, 2H), 6.73 (d, 1H), 2.39 (s, 3H).

1. temperatureThe reaction mixture was heated to for 2 h
2. extractionIt was extracted with ethyl acetate (200 ml)
3. customThe organic layer was dried
4. filtrationfiltered
5. customevaporated