1-Naphthol-3,8-disulfonic acid
- CAS NO.：117-43-1
- Empirical Formula: C10H8O7S2
- Molecular Weight: 304.3
- MDL number: MFCD00035718
- EINECS: 204-189-2
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:55:05
What is 1-Naphthol-3,8-disulfonic acid?
Chemical properties
White, crystalline scales. Soluble in hot water. 1-Hydroxynaphthalene-3,8-disulfonic acid [117-43-1]. (8-hydroxynaphthalene-1,6- disulfonic acid), epsilon acid, C10H8O7S2, Mr 304.3: the sodium salt crystallizes as the hexahydrate and is readily soluble in water. Alkali fusion at 200 ℃ gives 1,8-dihydroxynaphthalene-3-sulfonic acid and amination with ammonia and ammonium chloride at 170℃ gives 6,8-diaminonaphthalene-1-sulfonic acid. Diazo coupling takes place in the 2-position and bromination in the 4-position. The 1,8-sultone is formed on dehydration with concentrated sulfuric acid.
The Uses of 1-Naphthol-3,8-disulfonic acid
Azo-dye intermediate.
Production Methods
The acid sodium salt of 1-aminonaphthalene-3,8-disulfonic acid is hydrolyzed by heating with water under pressure at 180℃.
Properties of 1-Naphthol-3,8-disulfonic acid
| CAS DataBase Reference | 117-43-1(CAS DataBase Reference) |
| EPA Substance Registry System | 1,6-Naphthalenedisulfonic acid, 8-hydroxy- (117-43-1) |
Safety information for 1-Naphthol-3,8-disulfonic acid
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. 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 1-Naphthol-3,8-disulfonic acid
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