2-Hydroxy-1-naphthoic acid
- CAS NO.：2283-08-1
- Empirical Formula: C11H8O3
- Molecular Weight: 188.18
- MDL number: MFCD00004009
- EINECS: 218-919-2
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:54:15
What is 2-Hydroxy-1-naphthoic acid?
Chemical properties
2-Hydroxy-1-naphthoic acid [2283-08-1], C11H8O3, Mr 188.17, has a mp of 156 – 157℃ (decomp. to 2-naphthol and CO2). The monosodium salt is unstable in hot aqueous solution. 2- Hydroxy-1-naphthoic acid is decarboxylated by nitrous acid, forming 1-nitroso-2-naphthol, and by diazo salts, forming a 1-azo-2-naphthol. An ethanolic solution of 2-hydroxy-1-naphthoic acid gives a dark blue color with iron(III) chloride. Chlorosulfonic acid at 30℃ gives the 6-sulfonyl chloride derivative.
The Uses of 2-Hydroxy-1-naphthoic acid
?2-Hydroxy-1-naphthoic acid is an intermediate of minor importance in the synthesis of azo dyes.
Production Methods
Treatment of the dried sodium or potassium salt of 2-naphthol with carbon dioxide at 120 C under pressure gives an 80 % yield of product after careful work-up. Solvents such as toluene, tetralin, or diphenyl oxide are patented alternatives.
Properties of 2-Hydroxy-1-naphthoic acid
| Melting point: | 167 °C (dec.) (lit.) |
| Boiling point: | 283.17°C (rough estimate) |
| Density | 1.2100 (rough estimate) |
| refractive index | 1.6400 (estimate) |
| storage temp. | Sealed in dry,Room Temperature |
| pka | pK1:3.29;pK2:9.68 (20°C) |
| form | powder to crystal |
| color | White to Light red to Green |
| BRN | 975575 |
| CAS DataBase Reference | 2283-08-1(CAS DataBase Reference) |
| EPA Substance Registry System | 1-Naphthalenecarboxylic acid, 2-hydroxy- (2283-08-1) |
Safety information for 2-Hydroxy-1-naphthoic acid
| 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 2-Hydroxy-1-naphthoic acid
2-Hydroxy-1-naphthoic acid manufacturer
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