5-Amino-1-naphthol
- CAS NO.：83-55-6
- Empirical Formula: C10H9NO
- Molecular Weight: 159.18
- MDL number: MFCD00041826
- EINECS: 201-486-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:26:40
What is 5-Amino-1-naphthol?
Chemical properties
pale purple to brown-purple crystalline powder
The Uses of 5-Amino-1-naphthol
5-Amino-1-naphthol is used as a coupling component for azo dyes (coupling takes place ortho to the amino or hydroxyl group, or para to the hydroxyl group depending on the pH), and as an intermediate for sulfur dyes.
Preparation
1-Aminonaphthalene-5-sulfonic acid paste (Section 6.2) is added to molten sodium hydroxide at 200°C, and the reaction is completed by heating slowly to 250°C and maintaining this temperature for 3 h. After dilution and careful neutralization with hydrochloric acid, 5-amino-1-naphthol precipitates in 85 % yield (mp 192°C).
Properties of 5-Amino-1-naphthol
| Melting point: | 190 °C (dec.) (lit.) |
| Boiling point: | 284.68°C (rough estimate) |
| Density | 1.1202 (rough estimate) |
| refractive index | 1.6070 (estimate) |
| storage temp. | -20°C Freezer |
| solubility | DMSO (Slightly), Methanol (Slightly) |
| form | Solid |
| pka | 3.97(at 25℃) |
| color | Light Purple to Purple |
| CAS DataBase Reference | 83-55-6(CAS DataBase Reference) |
| NIST Chemistry Reference | 5-Amino-1-naphthol(83-55-6) |
| EPA Substance Registry System | 1-Naphthalenol, 5-amino- (83-55-6) |
Safety information for 5-Amino-1-naphthol
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
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. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. 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 5-Amino-1-naphthol
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