反应详情

温度

0 °C

A solution of boron tribromide (0.066 mol) in dichloromethane (66 ml) was added dropwise to a solution of 4-methoxy-2-(4-fluorophenyl)benzoic acid (7.7 g; 0.029 mol) in dried dichloromethane (215 ml) under argon at 0° C. The reaction was stirred for 1 hour at 0° C. and allowed to warm to ambient temperature and stirred for a further 16 hours. It was then poured into ice water and extracted with firstly dichloromethane then with ethyl acetate. The combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate and the aqueous phase acidified to pH 1 with concentrated HCl and extracted with ethyl acetate. The ethyl acetate extracts were dried (MgSO4) and concentrated in vacuo to give 4-hydroxy-2-(4-fluorophenyl)benzoic acid as a yellow oil (4.5 g), which was used without further purification.

1. temperatureto warm to ambient temperature
2. stirringstirred for a further 16 hours
3. extractionextracted with firstly dichloromethane
4. washThe combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate
5. extractionextracted with ethyl acetate
6. dry with materialThe ethyl acetate extracts were dried (MgSO4)
7. concentrationconcentrated in vacuo