6387. 2-Naphthol-3,6-disulfonic Acid

Nomenclature

CAS number: 148-75-4
3-Hydroxy-2,7-naphthalenedisulfonic acid; R acid.
C10H8O7S2; mol wt 304.30.
C 39.47%, H 2.65%, O 36.80%, S 21.07%.

Description and references

Prepn from β-naphthol and concd H2SO4: Fierz-David, Blangey, Fundamental Processes of Dye Chemistry (Interscience, New York, 1949) p 197.

Chemical structure

Properties

Deliquesc needles. Very sol in water, alcohol. Practically insol in ether. The sodium salt is known as R salt.

Use

In dye chemistry.