反应详情

To a solution of 25.0 g of 1-naphthylamine-3,8-disulfonic acid in 100 ml of water is added 20 ml of 5N sodium hydroxide with stirring. The mixture is warmed on a steambath and diluted with absolute ethyl alcohol to yield a crystalline precipitate. The solid is collected at room temperature and is washed with 75% aqueous ethyl alcohol, ethyl alcohol and ether. The product is dried in vacuo at 110° C. overnight to yield 22.8 g of (87%) 8-amino-1,6-naphthalenedisulfonic acid disodium salt.

1. temperatureThe mixture is warmed on a steambath
2. customto yield a crystalline precipitate
3. customThe solid is collected at room temperature
4. washis washed with 75% aqueous ethyl alcohol, ethyl alcohol and ether
5. customThe product is dried in vacuo at 110° C. overnight