反应详情

An ice cold solution of 2-propionylthiophene (1.40 g) in carbon tetrachloride (25 ml) was treated with a solution of bromine (0.54 ml) in carbon tetrachloride (20 ml) over 5 mins. The resulting solution was then stirred at room temperature. After 1.5 h the mixture was evaporated to an amber oil (2.17 g). A portion of the oil (600 mg) was subjected to preparative thin-layer chromatography on silica developing with chloroform-petrol (b.p. 60°-80° C.) (1:4) (4 runs) and gave an amber oil, the title bromide (410 mg), λmax (EtOH) 272.5 nm (ε7,910), 294 nm (ε8,340), νmax (CS2) 1658, 713 cm-1.

1. customAfter 1.5 h the mixture was evaporated to an amber oil (2.17 g)
2. customgave an amber oil