Ethanol → Disodium 4-aminonaphthalene-2,6-disulphonate

Participants

Reaction Steps

A 45.0 g amount of (62.5%) 1-naphthylamine-3,7-disulfonic acid is suspended in 200 ml of water and 30 ml of 5 N sodium hydroxide is added to it. The solution is warmed and absolute ethyl alcohol is added until a cloudy precipitate forms. The solution is cooled and the solid is collected by filtration and is washed with 85% ethyl alcohol, ethyl alcohol and ether. The product is dried in vacuo at 110° C. to give 21.0 g of 4-amino-2,6-naphthalenedisulfonic acid disodium salt.

Provenance & Evidence