1-Amino-2-naphthol-4-sulfonic Acid
Structural Formula Vector Image
Title: 1-Amino-2-naphthol-4-sulfonic Acid
CAS Registry Number: 116-63-2
CAS Name: 4-Amino-3-hydroxy-1-naphthalenesulfonic acid
Additional Names: 1,2,4-acid
Molecular Formula: C10H9NO4S
Molecular Weight: 239.25
Percent Composition: C 50.20%, H 3.79%, N 5.85%, O 26.75%, S 13.40%
Literature References: Prepd by treatment of nitroso-b-naphthol with sodium bisulfite and sulfuric acid: L. F. Fieser, Org. Synth. coll. vol. II, 42 (1943); cf. idem, J. Am. Chem. Soc. 57, 494 (1935).
Properties: White or gray needles, usually contg 0.5 H2O. May turn pink on exposure to light, especially when moist. Insol in water, alcohol, ether, benzene; sol in hot sodium bisulfite soln; sol in alkaline soln but such solns oxidize quickly on exposure to air yielding a brown substance which is sol in hot water giving a green soln. Controlled oxidation with HNO3 yields ammonium 1,2-naphthoquinone-4-sulfonate, see Fieser, loc. cit.
Derivative Type: Sodium salt
Molecular Formula: C10H8NNaO4S
Molecular Weight: 261.23
Percent Composition: C 45.98%, H 3.09%, N 5.36%, Na 8.80%, O 24.50%, S 12.27%
Properties: Needles, sol in hot water with blue fluorescence.
Use: Manuf of azo dyes, 1,2-naphthoquinone-4-sulfonic acid.

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