反应详情

温度

-5 °C

A solution of 1.87 g of NaNO2 in 7 ml of water is added slowly to a solution, cooled to -5° C., of 4.5 g of 4-amino-2,3-dimethylbenzoic acid in 135 ml of concentrated HCl. After 2 hours of stirring at -5° C., a solution of 25 g of SnCl2.2H2O in 250 ml of concentrated HCl is added at -10° C., and the mixture is stirred for 30 minutes at -5° C. and then 2 hours at RT. The mixture is filtered, and the precipitate is washed with 5 ml of concentrated HCl and dried under a stream of dry nitrogen and then under vacuum to obtain 5.5 g of expected product.

1. stirringthe mixture is stirred for 30 minutes at -5° C.
2. custom2 hours
3. customat RT
4. filtrationThe mixture is filtered
5. washthe precipitate is washed with 5 ml of concentrated HCl
6. customdried under a stream of dry nitrogen