3-Hydroxy-2-naphthoic acid
Synonym(s):β-Hydroxynaphthoic acid;3-Hydroxy-2-naphthoic acid;BON
- CAS NO.:92-70-6
- Empirical Formula: C11H8O3
- Molecular Weight: 188.18
- MDL number: MFCD00004103
- EINECS: 202-180-8
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-12-18 14:08:57
What is 3-Hydroxy-2-naphthoic acid?
Chemical properties
yellow to beige-brown fine crystalline powder. 3 -Hydroxy-2-naphthoic acid [92-70-6], BON acid, C11H8O3, Mr 188.17, mp 222℃, forms pale yellow crystals from aqueous ethanol. Alkaline solutions have a green fluorescence. Aqueous ferric chloride produces a blue color, and warming with CHCl3– NaOH results in a green color. Oxidation with alkaline permanganate gives 2-carboxyphenylglyoxylic acid and then phthalic acid. Dry distillation produces dibenzoxanthone. Bromination gives the 4,7-dibromo derivative; nitration, the 4-nitro derivative; and sulfonation with oleum, the 5,7-disulfonic acid derivative.
The Uses of 3-Hydroxy-2-naphthoic acid
3-Hydroxy-2-naphthoic acid is mainly used as intermediate for the production of dyes and pigments. Further uses are as intermediate for insecticides and pharmaceuticals (ECB, 2000).
The Uses of 3-Hydroxy-2-naphthoic acid
2-hydroxy-3-naphthoic acid (BON) is coupled with diazo compounds and their calcium salts are bright red bleed resistance pigments. The somewhat higher cost manganese salt shows better exterior durability than the calcium or barium salts. The BON red pigments are characterized by an extremely high degree of color stability, resistance to acids and alkalies and are nontoxic.
Definition
ChEBI: 3-Hydroxy-2-naphthoate is a naphthoic acid.
Preparation
3 -Hydroxy-2-naphthoic acid is invariably by the Kolbe – Schmitt reaction of carbon dioxide with the dried sodium salt of 2-naphthol at 220 – 260℃. Many improvements in both process and equipment have been developed. The main problems are removal of the 50 % unreacted 2-naphthol and avoidance of a tarry byproduct. Yields of 80 % based on the amount of 2-naphthol consumed are possible despite the low conversion.
Hazard
Irritant.
Purification Methods
Crystallise it from water or acetic acid. The S-benzyisothiuronium salt has m 216-217o (from EtOH). It forms many metal complex salts. [Beilstein 10 H 333, 10 III 1084.]
Properties of 3-Hydroxy-2-naphthoic acid
Melting point: | 218-221 °C(lit.) |
Boiling point: | 283.17°C (rough estimate) |
Density | 1.43 g/cm3 (23℃) |
refractive index | 1.7160 (estimate) |
Flash point: | >150°C |
storage temp. | Sealed in dry,Room Temperature |
solubility | 0.072g/l practically insoluble |
form | Fine Crystalline Powder |
pka | 3.02±0.30(Predicted) |
color | Yellow to beige-brown |
Water Solubility | PRACTICALLY INSOLUBLE |
λmax | 395nm(H2O (pH 3.5))(lit.) |
Merck | 14,4835 |
BRN | 744100 |
CAS DataBase Reference | 92-70-6(CAS DataBase Reference) |
NIST Chemistry Reference | 2-Naphthalenecarboxylic acid, 3-hydroxy-(92-70-6) |
EPA Substance Registry System | 3-Hydroxy-2-naphthoic acid (92-70-6) |
Safety information for 3-Hydroxy-2-naphthoic acid
Signal word | Danger |
Pictogram(s) |
Corrosion Corrosives GHS05 Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H302:Acute toxicity,oral H318:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation H412:Hazardous to the aquatic environment, long-term hazard |
Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P273:Avoid release to the environment. 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. 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 3-Hydroxy-2-naphthoic acid
3-Hydroxy-2-naphthoic acid manufacturer
Santel Industries
Jaffs Dyechem Private Limited
Bhimani Group
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