反应详情

温度

-78 °C

To a mixture of 1-(3-bromo-5-chloro-2-methoxy-4-methylphenyl)ethanone (1.0 g, 3.6 mmol) in methylene chloride (20 mL) was added 1.0 M boron tribromide in methylene chloride (3.8 mL, 3.8 mmol) at −78° C. After stirring at −78° C. for 10 minutes, the reaction was allowed to warm to 0° C. and was then quenched with water at 0° C. and extracted with dichloromethane. The combined organic layers were washed with brine and dried over sodium sulfate. The volatiles were removed under reduced pressure to afford 1-(3-Bromo-5-chloro-2-hydroxy-4-methylphenyl)ethanone (0.91 g, 96%). 1H NMR (CDCl3, 300 MHz) δ 12.96 (1H, s), 7.72 (1H, s), 2.64 (3H, s), 2.59 (3H, s) ppm.

1. temperatureto warm to 0° C.
2. customwas then quenched with water at 0° C.
3. extractionextracted with dichloromethane
4. washThe combined organic layers were washed with brine
5. dry with materialdried over sodium sulfate
6. customThe volatiles were removed under reduced pressure