| With bromine; In 1,4-dioxane; diethyl ether; at 0℃; for 4h; | Example 1A 2-Bromo-<strong>[2923-66-2]1-(3-chloro-4-fluorophenyl)ethanone</strong> At 0 C., 1.00 g (5.79 mmol) of <strong>[2923-66-2]3-chloro-4-fluoroacetophenone</strong> is provided in 20 ml of a 1:1 mixture of 1,4-dioxane and diethyl ether, a solution of 0.30 ml (5.79 mmol) of bromine in 10 ml of a 1:1 mixture of 1,4-dioxane and diethyl ether is added dropwise with exclusion of light and the mixture is stirred for 4 hours. Water and dichloromethane are subsequently added, the phases are separated, the aqueous phase is extracted with dichloromethane and, the combined organic phases are dried over sodium sulfate, filtered and concentrated. 1.35 g (63% of theory) of the title compound having a purity of 68% are obtained which are reacted without further purification. 1H-NMR (400 MHz, DMSO-d6): delta=8.23 (dd, 1H), 8.04 (ddd, 1H), 7.63 (t, 1H), 4.97 (s, 2H). GC-MS (Method 11): Rt=5.22 min; MS (EIpos): m/z=252 [M]+. |