反应详情

A mixture of ethyl α-bromo-4-chlorophenylacetate (37.3 g), anhydrous potassium fluoride (9.7 g) and dry dimethylformamide (75 ml) was heated with stirring at a temperature of 140°-150° C. for a period of 6 hours. The reaction mixture was poured into water and the aqueous mixture extracted with methylene dichloride. The organic extract was washed with aqueous sodium carbonate, dried over anhydrous sodium sulfate and the solvent was removed by distillation under reduced pressure. The product was distilled using a spinning band column to give ethyl α-fluoro-4-chlorophenylacetate (7.5 g; 29%) b.p. 67° C. at 0.06 mm Hg.

1. temperaturewas heated
2. extractionthe aqueous mixture extracted with methylene dichloride
3. extractionThe organic extract
4. washwas washed with aqueous sodium carbonate
5. dry with materialdried over anhydrous sodium sulfate
6. customthe solvent was removed by distillation under reduced pressure
7. distillationThe product was distilled