Acetone → 1,5-Bis(2-thienyl)-1,4-pentadien-3-one

Participants

Reaction Steps

2-Thiophenecarboxaldehyde (33, 0.50 ml, 5.3 mmol) and acetone (19, 0.20 ml, 2.7 mmol) were combined in ethanol (10 ml) and stirred for 10 min at room temperature. A solution of sodium hydroxide (0.30 g, 7.5 mmol) and water (10 ml) was added and the mixture stirred for 18 hr at room temperature. The resulting precipitate was filtered and recrystallized from ethanol/water to give 0.55 g (82%) of a yellow solid: mp 115-117° C. [expected mp 115-117° C.]; 1H NMR: δ 6.80 (d, 2H, J=15.5 Hz), 7.06 (dt, 2H, J=3.6, 1.4 Hz), 7.31 (d, 2H, J=3.4 Hz), 7.39 (d, 2H, J=5.0 Hz), 7.82 (d, 2H, J=15.5 Hz); 13C NMR: δ 124.4, 128.2, 128.7, 131.7, 135.5, 140.2, 187.5.

Provenance & Evidence