2-Naphthylamine-8-sulfonic acid
- CAS NO.：86-60-2
- Empirical Formula: C10H9NO3S
- Molecular Weight: 223.25
- MDL number: MFCD00035725
- EINECS: 201-685-0
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:55:33
What is 2-Naphthylamine-8-sulfonic acid?
Description
2-Aminonaphthalene-8-sulfonic acid [86- 60-2]. (7-aminonaphthalene-1-sulfonic acid), Badische acid, C10H9NO3S, Mr 223.24, crystallizes from water as needles or prisms although only 0.5 % soluble at 100 ℃. Alkalimetal salts are quite soluble in water. Caustic fusion yields 7-amino-1-naphthol, sulfonation in the cold with 20 % oleum gives 2-aminonaphthalene-6,8-disulfonic acid, but nitration gives a mixture of products. 2-Aminonaphthalene-8-sulfonic acid reacts with diazo compounds to form diazoamino compounds rather than coupling to give azo derivatives.
Chemical properties
Colorless needles, partially soluble in water and alkalies, slightly soluble in alcohol.
The Uses of 2-Naphthylamine-8-sulfonic acid
Azo dye intermediate.
Production Methods
2-Hydroxynaphthalene-8-sulfonic acid is aminated by a Bucherer reaction under conditions similar to those used for Tobias acid.
Properties of 2-Naphthylamine-8-sulfonic acid
| Boiling point: | 220°C (rough estimate) |
| Density | 1.3588 (rough estimate) |
| refractive index | 1.6500 (estimate) |
| pka | -0.34±0.40(Predicted) |
| Water Solubility | 0.6g/L(20 ºC) |
Safety information for 2-Naphthylamine-8-sulfonic acid
Computed Descriptors for 2-Naphthylamine-8-sulfonic acid
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