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3-Hydroxy-2-naphthoic acid

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3-Hydroxy-2-naphthoic acid Basic information

Product Name:
3-Hydroxy-2-naphthoic acid
Synonyms:
  • 3-hydroxy-2-naphthoicaci
  • 3-Hydroxy-beta-naphthoic acid
  • developer8
  • developerbon
  • Kyselina 3-hydroxy-2-naftoova
  • kyselina3-hydroxy-2-naftoova
  • Miketazol Developer ONS
  • miketazoldeveloperons
CAS:
92-70-6
MF:
C11H8O3
MW:
188.18
EINECS:
202-180-8
Product Categories:
  • Building Blocks
  • C11 to C12
  • Carbonyl Compounds
  • Carboxylic Acids
  • Chemical Synthesis
  • Organic Building Blocks
  • Intermediates of Dyes and Pigments
  • Intermediates
  • Naphthalene derivatives
  • Organics
  • bc0001
  • john's
Mol File:
92-70-6.mol
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3-Hydroxy-2-naphthoic acid Chemical Properties

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
pka
3.02±0.30(Predicted)
form 
Fine Crystalline Powder
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)
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Safety Information

Hazard Codes 
Xn,Xi
Risk Statements 
22-36-36/37/38
Safety Statements 
26-37/39
WGK Germany 
1
RTECS 
QL1755000
TSCA 
Yes
HS Code 
29182910
Hazardous Substances Data
92-70-6(Hazardous Substances Data)
Toxicity
The acute oral LD50 of 3-Hydroxy-2-naphthoic acid in rats was 823-1040 mg/kg bw.

MSDS

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3-Hydroxy-2-naphthoic acid Usage And Synthesis

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.

Uses

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).

Uses

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.]

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