反应详情

A 163-g (0.56 mole) sample of 2,3-dibromo-2,3,3-trifluoropropionyl fluoride was added dropwise to a mechanically stirred suspension of 76 g (0.56 mole) of aluminum chloride in 282 ml of methylene chloride. The reaction mixture warmed spontaneously to 40°. After cooling, the volatile portion of the reaction mixture was distilled under reduced pressure into a Dry Ice-cooled trap. Redistillation gave 97.5 g (57%) of 2,3-dibromo-2,3,3-trifluoropropionyl chloride as a colorless liquid: bp 128°-129°; nD25 1.4436; ir (liquid) 5.57 μ (COCl); 19F nmr (CCl3F) δ 55.7 ppm (d, J = 175 Hz to d, J = 14.5 Hz, 1F), 57.9 ppm (d, J = 175 Hz to d, J = 16 Hz, 1F) and 116.5 ppm (d, J = 16 Hz to d, J = 14.5 Hz, 1F).

1. temperatureThe reaction mixture warmed spontaneously to 40°
2. temperatureAfter cooling
3. distillationthe volatile portion of the reaction mixture was distilled under reduced pressure into a Dry Ice-
4. temperaturecooled trap
5. distillationRedistillation