反应详情

温度

10 °C

A solution of 9.73 g of 3-amino-5-methoxy-1-trifluoromethylbenzene in 400 ml of 2N HCl is cooled to 10° C., and a solution of 3.80 g of sodium nitrite in 20 ml of water is added in the course of 10 minutes. The mixture is left stirring for 30 minutes at 10° C., and a solution of 800 ml of concentrated H2SO4 in 800 ml of water is added while the temperature is maintained below 20° C. The mixture is then heated to 95° C. for 2 hours and left overnight at r.t. 1000 g of ice are added to the reaction medium, the mixture is extracted with ether, the organic phase is washed with saturated sodium chloride solution and dried over sodium sulphate and the solvent is evaporated off under vacuum. 9.8 g of 3-hydroxy-5-methoxy-1-trifluoromethylbenzene, m.p.≈75° C. (according to J. Chem. Soc., 1951, 2013) are obtained.

1. waitThe mixture is left
2. temperatureis maintained below 20° C
3. temperatureThe mixture is then heated to 95° C. for 2 hours
4. waitleft overnight at r.t
5. extractionthe mixture is extracted with ether
6. washthe organic phase is washed with saturated sodium chloride solution
7. dry with materialdried over sodium sulphate
8. customthe solvent is evaporated off under vacuum