1-Hydroxynaphthalene-8-sulfonic acid
- CAS NO.：117-22-6
- Empirical Formula: C10H8O4S
- Molecular Weight: 224.23
- MDL number: MFCD00065328
- EINECS: 204-180-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-28 03:35:22
What is 1-Hydroxynaphthalene-8-sulfonic acid?
Chemical properties
1-Hydroxynaphthalene-8-sulfonic acid [117-22-6]. (8-hydroxynaphthalene-1-sulfonic acid), C10H8O4S, Mr 224.2, crystallizes as the monohydrate with mp 106℃. Sulfonation gives 1-hydroxynaphthalene-4,8-disulfonic acid, and alkali fusion with potassium hydroxide at 230℃ yields 1,8-dihydroxynaphthalene. Coupling with diazo compounds occurs in the 2- position.
The Uses of 1-Hydroxynaphthalene-8-sulfonic acid
The naphthosultone is usually satisfactory as an intermediate for further processing; however, for azo dye preparation the free naphthol must be used, for example, in C.I. Acid Black 54 and C.I. Acid Blue 158.
Production Methods
1-Aminonaphthalene-8-sulfonic acid is diazotized over 16 h at 50℃ and then heated to 80 ℃. After cooling, the precipitated naphthosultone is filtered off and washed. The sultone is heated with dilute sodium hydroxide at 100℃, which causes ring opening; the product is isolated after salting out.
Properties of 1-Hydroxynaphthalene-8-sulfonic acid
| Density | 1.549 |
| pka | 0.05±0.40(Predicted) |
| CAS DataBase Reference | 117-22-6(CAS DataBase Reference) |
| EPA Substance Registry System | 1-Naphthalenesulfonic acid, 8-hydroxy- (117-22-6) |
Safety information for 1-Hydroxynaphthalene-8-sulfonic 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. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. 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-Hydroxynaphthalene-8-sulfonic acid
1-Hydroxynaphthalene-8-sulfonic acid manufacturer
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