2-Amino-1,5-naphthalenedisulfonic acid
- CAS NO.：117-62-4
- Empirical Formula: C10H9NO6S2
- Molecular Weight: 303.31
- MDL number: MFCD00021512
- EINECS: 204-201-6
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-27 22:51:37
What is 2-Amino-1,5-naphthalenedisulfonic acid?
Description
2-Aminonaphthalene-1,5-disulfonic acid [117-62-4]. 5-sulfo-Tobias acid, C10H9NO6S2, Mr 303.32, is purified by crystallization of the dipotassium salt from water. Alkali fusion results in formation of 2-amino-5-hydroxynaphthalene-1-sulfonic acid. Sulfonation (40 % oleum, 100℃) gives 2-aminonaphthalene-1,5,7-trisulfonic acid. Heating with aqueous sulfuric acid produces 2-aminonaphthalene-5- sulfonic acid. The diazo compound is converted to 2-diazo-1-hydroxynaphthalene-5-sulfonic acid on treatment with alkaline hypochlorite.
Chemical properties
BEIGE POWDER
The Uses of 2-Amino-1,5-naphthalenedisulfonic acid
?As a diazo component in orange and red azo reactive dyes, 2-Amino-1,5-naphthalenedisulfonic acid gives more bathochromic shades than Tobias acid.
Production Methods
Sulfonation of Tobias acid to produce 2-aminonaphthalene-5-sulfonic acid proceeds via 2-Aminonaphthalene-1,5-disulfonic acid, which is isolated from the quenched reaction mixture with careful avoidance of desulfonation.
Properties of 2-Amino-1,5-naphthalenedisulfonic acid
| Boiling point: | 205.8°C (rough estimate) |
| Density | 1.6329 (rough estimate) |
| refractive index | 1.7330 (estimate) |
| storage temp. | 2-8°C |
| pka | -0.51±0.40(Predicted) |
| Water Solubility | soluble |
| CAS DataBase Reference | 117-62-4(CAS DataBase Reference) |
| EPA Substance Registry System | 1,5-Naphthalenedisulfonic acid, 2-amino- (117-62-4) |
Safety information for 2-Amino-1,5-naphthalenedisulfonic acid
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H319:Serious eye damage/eye irritation |
| Precautionary Statement Codes |
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 2-Amino-1,5-naphthalenedisulfonic acid
2-Amino-1,5-naphthalenedisulfonic acid manufacturer
DL Intrachem
Suraj Impex
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