反应详情

温度

0 °C

A solution of 2.17 g of NaNO2 in 40 ml of H2O is added slowly to a solution, cooled to 0° C., of 5 g of 4-amino-3-methoxybenzoic acid in 50 ml of concentrated HCl. After 1 hour 15 minutes of stirring at 0° C., the mixture is cooled to -10° C., and a solution of 23.6 g of SnCl2 ·2H2O in 20 ml of concentrated HCl and 20 ml of water is added over 30 min. After one and a half hours of stirring at -10° C., the mixture is filtered, and the precipitate is washed with 50 ml of pentane to obtain, after drying, 6 g of expected product.

1. temperaturethe mixture is cooled to -10° C.
2. stirringAfter one and a half hours of stirring at -10° C.
3. filtrationthe mixture is filtered
4. washthe precipitate is washed with 50 ml of pentane
5. customto obtain
6. customafter drying