Schaeffer Acid

Name:
Schaeffer Acid
Detailed information:

Chemistry name:	2-naphthol-6-sulfonic acid; β-naphtholsulfonic acid
Chemistry structure:
Properties:
White leaflets. Mp 122C. Soluble in water and alcohol.
Derivation:
Sulfonation of β-naphthol with 94% sulfuric acid at 95C, yielding a mixture comprising chiefly Schaeffer acid (56%), R-acid (15%), and G-acid (10%). Separation is effected by dilution with water, boiling to hydrolyze the sulfonic acid group, and addition of metallic salts.
Use:
Azo dye intermediate.