4-aminonaphthalene-1,7-disulfonic acid
- CAS NO.：85-74-5
- Empirical Formula: C10H9NO6S2
- Molecular Weight: 303.31
- MDL number: MFCD00021550
- EINECS: 201-629-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:26:07
What is 4-aminonaphthalene-1,7-disulfonic acid?
Description
1-Aminonaphthalene-4,6-disulfonic acid [85-74-5]. (4-aminonaphthalene-1,7-disulfonic acid), Dahl’s acid II, C10H9NO6S2, Mr 303.3, and its alkali-metal salts are soluble in water; the calcium salt is soluble in aqueous ethanol. Caustic fusion at 180℃ yields 1-amino-6-hydroxynaphthalene-4-sulfonic acid, but at higher temperature 4,7-dihydroxynaphthalene1-sulfonic acid is formed. Sulfonation with 35 % oleum at 80℃ gives 1-aminonaphthalene-2,4,6-trisulfonic acid.
Preparation
Naphthionic acid is sulfonated with 25 % oleum at 20℃ to give a 70 : 30 mixture of 1,4,7- and 1,4,6-trisulfonic acids, which is used as mixed Dahl’s acids.
Properties of 4-aminonaphthalene-1,7-disulfonic acid
| Boiling point: | 205.8°C (rough estimate) |
| Density | 1.6329 (rough estimate) |
| refractive index | 1.7330 (estimate) |
| pka | -0.84±0.40(Predicted) |
| EPA Substance Registry System | 1,7-Naphthalenedisulfonic acid, 4-amino- (85-74-5) |
Safety information for 4-aminonaphthalene-1,7-disulfonic acid
Computed Descriptors for 4-aminonaphthalene-1,7-disulfonic acid
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