反应详情

4-Chlorobenzaldehyde (1x, 1.00 g, 7.1 mmol) and acetone (19, 0.26 ml, 3.5 mmol) were combined in ethanol (10 ml) and stirred for 15 min at room temperature. A solution of sodium hydroxide (0.40 g, 10.0 mmol) and water (10 ml) was added and the mixture stirred for 3 hr at room temperature. The resulting precipitate was filtered and recrystallized from ethyl acetate to give 0.75 g (70%) of yellow crystals: mp 187-189° C. [expected mp 191-193° C.]; 1H NMR: δ 7.00 (d, 2H, J=15.9 Hz), 7.37 (d, 4H, J=8.5 Hz), 7.52 (d, 4H, J=8.5 Hz), 7.66 (d, 2H, J=15.9 Hz); 13C NMR: δ 125.7, 129.2, 129.5, 133.2, 136.4, 141.9, 188.1.

1. stirringthe mixture stirred for 3 hr at room temperature
2. filtrationThe resulting precipitate was filtered
3. customrecrystallized from ethyl acetate