1-Amino-2-naphthol-6-sulfonic Acid
Title: 1-Amino-2-naphthol-6-sulfonic Acid
CAS Registry Number: 5639-34-9
CAS Name: 5-Amino-6-hydroxy-2-naphthalenesulfonic 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 reduction of sodium 1-nitroso-2-naphthol-6-sulfonate with zinc and acetic acid: Fierz-David et al., Helv. Chim. Acta 29, 1765 (1946).
Properties: Needles or prisms. Slightly sol in boiling water, less sol in alc. Practically insol in ether.
 
Derivative Type: Sodium salt hemipentahydrate
Trademarks: Eikonogen
Molecular Formula: C10H8NNaO4S.2½H2O
Molecular Weight: 306.27
Percent Composition: C 39.22%, H 4.28%, N 4.57%, Na 7.51%, O 33.96%, S 10.47%
Properties: Powder. Sol in water. Practically insol in alc, ether. Strong reducing action on silver salts.
 
Use: Free acid formerly used in manuf of azo dyes. Sodium salt used as photographic developer and for detection of potassium.

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