反应详情

温度

85 °C

A mixture of 10.0 g of 4-bromo-2-fluoro-1-nitrobenzene, 44.4 g of caesium carbonate and 100 ml of isopropanol is heated at 85° C. (bath) for 1 h 30, and then left to cool to ambient temperature. The mixture is concentrated under vacuum and the residue is taken up with 400 ml of water and 300 ml of ethyl acetate. The aqueous phase is extracted with 100 ml of ethyl acetate and the combined organic phases are washed twice with 200 ml of water. The organic phases are dried over magnesium sulfate and concentrated under vacuum, so as to obtain 11.59 g of crude 4-bromo-1-nitro-2-(propan-2-yloxy)benzene in the form of a yellow oil which crystallizes. TLC: Rf=0.52 (dichloromethane/heptane (1/1)).

1. waitleft
2. temperatureto cool to ambient temperature
3. concentrationThe mixture is concentrated under vacuum
4. extractionThe aqueous phase is extracted with 100 ml of ethyl acetate
5. washthe combined organic phases are washed twice with 200 ml of water
6. dry with materialThe organic phases are dried over magnesium sulfate
7. concentrationconcentrated under vacuum