6392. 2-Naphthol-6-sulfonic Acid

Nomenclature

CAS number: 93-01-6

6-Hydroxy-2-naphthalenesulfonic acid; Schaeffer's β-acid.

C₁₀H₈O₄S; mol wt 224.23.

C 53.56%, H 3.60%, O 28.54%, S 14.30%.

Prepn from β-naphthol and concd H₂SO₄: Fierz-David, Blangey, Fundamental Processes of Dye Chemistry (Interscience, New York, 1949) p 194.

Leaflets. mp 125°. Very sol in water, alcohol. Practically insol in ether.

Sodium salt.

Schaeffer's salt.

C₁₀H₇NaO₄S; mol wt 246.21.

C 48.78%, H 2.87%, Na 9.34%, O 25.99%, S 13.02%.

Light yellow to pink powder. Freely sol in water; slightly sol in alcohol.

In dye chemistry.