J Acid

Name:
J Acid
Detailed information:

Chemistry name:	2-amino-5-naphthol-7-sulfonic acid
Chemistry structure:
Properties:
Gray needles, white when pure. Soluble in hot water; sparingly soluble in cold water.
Derivation:
β-naphthylamine sulfate is sulfonated with 66% oleum, the filtrate yields 2-naphthylamine-1,5,7-trisulfonic acid. On reaction with dilute sulfuric acid at 125C, this yields 2-naphthylamine-5,7-disulfonic acid; from this J acid is obtained on reaction with 58% sodium hydroxide solution at 200C and 210 psi.
Use:
Azo dye intermediate.