1-[(2,5-dimethoxyphenyl)azo]-2-naphthol
Synonym(s):1-(2,5-Dimethoxyphenylazo)-2-naphthol
- CAS NO.：6358-53-8
- Empirical Formula: C18H16N2O3
- Molecular Weight: 308.33
- MDL number: MFCD01712266
- EINECS: 228-778-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-06-24 18:39:39
![1-[(2,5-dimethoxyphenyl)azo]-2-naphthol Structural](https://img.chemicalbook.in/CAS/GIF/6358-53-8.gif)
What is 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol?
The Uses of 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol
To color orange skins.
Preparation
2,5-Dimethoxyaniline diazotization, and Naphthalen-2-ol coupling.
Definition
ChEBI: Citrus Red No.2 is a member of azobenzenes.
General Description
Orange to yellow solid or dark red powder.
Air & Water Reactions
Azo dyes can be explosive when suspended in air at specific concentrations. Insoluble in water.
Reactivity Profile
1-[(2,5-dimethoxyphenyl)azo]-2-naphthol is an azo compound. Toxic gases are formed by mixing compounds containing azo groups with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.
Hazard
Possible carcinogen.
Health Hazard
ACUTE/CHRONIC HAZARDS: When heated to decomposition it emits toxic fumes of NOx.
Fire Hazard
Flash point data for 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol are not available. 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol is probably combustible.
Safety Profile
Confirmed carcinogen with experimental carcinogenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx
Properties and Applications
orange to red. Melting point of 155 ~ 157 ℃. Slightly soluble in water, slightly soluble in ethanol and rape oil.
Properties of 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol
| Melting point: | 155-157° |
| Boiling point: | 448.73°C (rough estimate) |
| Density | 1.2510 (rough estimate) |
| refractive index | 1.5700 (estimate) |
| Colour Index | 12156 |
| pka | 13.61±0.50(Predicted) |
| form | neat |
| BRN | 4510811 |
| IARC | 2B (Vol. 8, Sup 7) 1987 |
| EPA Substance Registry System | Citrus Red No. 2 (6358-53-8) |
Safety information for 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol
| Signal word | Warning |
| Pictogram(s) |
 Health Hazard GHS08 |
| GHS Hazard Statements |
H351:Carcinogenicity |
| Precautionary Statement Codes |
P281:Use personal protective equipment as required. |
Computed Descriptors for 1-[(2,5-dimethoxyphenyl)azo]-2-naphthol
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