反应详情

To a solution of 20 ml of concentrated hydrochloric acid and 15 ml of 95% ethanol is added 5.0 g (24 mmole) of 2-fluoro,4-nitrobenzotrifluoride. The mixture is stirred and 20 g (88 mmole) of stannous chloride dihydrate is added in portions over a 30 min period. The reaction is exothermic and during the addition the temperature is maintained at 60°. When the addition is complete, the mixture is stirred at 60° for an additional 30 min. The reaction is cooled and poured onto a mixture of ice and 36% sodium hydroxide, which is extracted with ether (3×). The combined ether layers are washed once with brine and dried over sodium sulfate. Filtration and evaporation of the solvent gave 4-amino,2-fluorobenzotrifluoride (3-fluoro-4-trifluoromethylaniline).

1. additionThe reaction is exothermic and during the addition the temperature
2. temperatureis maintained at 60°
3. additionWhen the addition
4. stirringthe mixture is stirred at 60° for an additional 30 min
5. temperatureThe reaction is cooled
6. extractionis extracted with ether (3×)
7. washThe combined ether layers are washed once with brine
8. dry with materialdried over sodium sulfate
9. filtrationFiltration and evaporation of the solvent