1-Naphthol-3,6-disulfonic acid
- CAS NO.：578-85-8
- Empirical Formula: C10H8O7S2
- Molecular Weight: 304.3
- MDL number: MFCD00065322
- EINECS: 209-432-6
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-12-31 14:38:37
What is 1-Naphthol-3,6-disulfonic acid?
Chemical properties
Off-white paste. 1-Hydroxynaphthalene-3,6-disulfonic acid [578-85-8]. (4-hydroxynaphthalene-2,7- disulfonic acid), RG acid, Violet acid, C10H8O7S2, Mr 304.3: the free acid ( pKa 8.56) and its alkalimetal salts are readily soluble in water, but the acid sodium salt can be precipitated from concentrated solution with salt. Sulfonation with oleum at 125℃ gives a tetrasulfonic acid, and amination with ammonia and ammonium chloride at 160℃ gives a mixture of 3-amino1-hydroxynaphthalene-6-sulfonic acid and 6- amino-1-hydroxynaphthalene-3-sulfonic acid. Alkali fusion at 170℃ gives mainly 1,6-dihydroxynaphthalene-3-sulfonic acid, and at 250℃ yields 1,3,6-trihydroxynaphthalene. Diazo coupling takes place in the 2-position.
The Uses of 1-Naphthol-3,6-disulfonic acid
1-Naphthol-3,6-disulfonic acid is mainly used in the manufacture of acid dyes
Production Methods
Naphthalene-1,3,6-trisulfonic acid is heated with 50 % sodium hydroxide at 180 C for 15 h in an autoclave. After dilution with water, the product is salted out as the monosodium salt and purified by washing with brine.
Properties of 1-Naphthol-3,6-disulfonic acid
| Density | 1.816±0.06 g/cm3(Predicted) |
| pka | -0.14±0.40(Predicted) |
| CAS DataBase Reference | 578-85-8(CAS DataBase Reference) |
| EPA Substance Registry System | 2,7-Naphthalenedisulfonic acid, 4-hydroxy- (578-85-8) |
Safety information for 1-Naphthol-3,6-disulfonic acid
Computed Descriptors for 1-Naphthol-3,6-disulfonic acid
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