Tobias Acid

Name:
Tobias Acid
Detailed information:

Chemistry name:	2-naphthylamine-1-sulfonic acid; 2-amino-1-naphthalene-sulfonic acid
Chemistry structure:
Properties:
White needles. Soluble in hot water.
Derivation:
Sulfonation of β-naphthol with chlorosulfonic acid in nitrobenzene at 0C followed by heating the resulting 1-sulfonic acid with ammonium hydrogen sulfite and ammonia at 145–150C. Purification is by precipitation from dilute solution of the sodium salt.
Use:
Azo dye intermediate, optical brighteners.