Contact us: +91 9550333722 040 - 40102781
Structured search
India
Choose your country
Different countries will display different contents
Try our best to find the right business for you.
My chemicalbook

Welcome back!

HomeProduct name list2,3-Dihydroxynaphthalene

2,3-Dihydroxynaphthalene

Synonym(s):2,3-Dihydroxynaphthalene;2,3-Naphthalenediol

  • CAS NO.:92-44-4
  • Empirical Formula: C10H8O2
  • Molecular Weight: 160.17
  • MDL number: MFCD00004073
  • EINECS: 202-156-7
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-12-18 14:15:32
2,3-Dihydroxynaphthalene Structural

What is 2,3-Dihydroxynaphthalene?

Chemical properties

Off white to redish white powder. 2,3-Naphthalenediol [92-44-4], mp 161℃, gives a dark blue color with iron(III) chloride; is aminated to 2- amino-3-naphthol at 140℃ and 2,3-naphthalenediamine at 240℃; and couples with diazotized anilines in the 1- or 1,4-positions.

The Uses of 2,3-Dihydroxynaphthalene

2,3-Dihydroxynaphthalene is used in making dyes, pigments, fluorescent whiteners, tanning agents, antioxidants, and antiseptics.

The Uses of 2,3-Dihydroxynaphthalene

2,3-Naphthalenediol is used in cosmetics asa component of oxidative hair dye. It is usedat a concentration of <0.1%.

The Uses of 2,3-Dihydroxynaphthalene

2,3-Dihydroxynaphthalene may be used in the following studies:

  • Construction of dinaphtho[2,1-b;2′,3′-d]furan-6-ol, via dehydration reaction in the presence of strong acid.
  • As fused ring catecholate type ligand for the surface modification of nanocrystalline TiO2 particles.
  • As adsorptive and competing ligand during the chemical speciation of iron in seawater by cathodic stripping voltammetry.
  • Synthesis of cyclotriphosphazene derivatives, used as non-halogen flame retardants

Definition

ChEBI: Naphthalene-2,3-diol is a naphthalenediol.

General Description

2,3-Dihydroxynaphthalene is a polyhydroxy phenol. It is an aromatic dihydroxy compound having hydroxyl groups at ortho positions. Its reaction with molybdenum(VI) complexes has been reported. The asymmetric oxidative coupling polymerization of 2,3-dihydroxynaphthalene using the Cu(I)-bisoxazoline complex as catalyst has been reported to afford poly(2,3-dihydroxy-1,4-naphthylene), having a continuous 1,1′-bi-2-naphthol main chain structure. The nitrodisplacement reaction between nitrophthalodinitriles and 2,3-dihydroxynaphthalene has been investigated.

Health Hazard

2,3-Naphthalenediol shows low toxicity andmild irritant actions on the skin and eyes. Theoral LD50 value for rats of a 5% solutionin propylene glycol may be on the orderof 675 mg/kg (calculated by the method ofWeil). The intravenous LD50 value for miceis 56 mg/kg. At 1% concentration, it causedslight eye irritation in female albino rabbitsand exhibited erythemal response in guineapigs. At the 0.1% level (concentration in hairdye), it had no reaction on human skin. Thiscompound was nonmutagenic in Salmonellatyphimurium strain tests.
There is very little information in the literatureon the toxicity of 2,3-naphthalenediol.Assessment by the CIR expert panel on thesafety of this compound as used in cosmeticshas been inconclusive (Cosmetic, Toiletryand Fragrance Association 1987b).

Synthesis

2,3-Dihydroxynaphthalene is prepared by caustic fusion of 3-hydroxynaphthalene-2,6-disulfonic acid followed by treatment with dilute sulfuric acid under pressure, or by acid desulfonation of 2,3-dihydroxynaphthalene-6-sulfonic acid.

Properties of 2,3-Dihydroxynaphthalene

Melting point: 161-165 °C (lit.) 162-164 °C
Boiling point: 246.06°C (rough estimate)
Density  1.0924 (rough estimate)
vapor pressure  0.8 hPa (149 °C)
refractive index  1.5178 (estimate)
Flash point: 175 °C
storage temp.  Store below +30°C.
solubility  4g/l
pka 9.10±0.40(Predicted)
form  Powder
color  White to pinkish to beige-grayish
PH 6 (1g/l, H2O, 20℃)
Water Solubility  slightly soluble
BRN  742375
CAS DataBase Reference 92-44-4(CAS DataBase Reference)
NIST Chemistry Reference 2,3-Naphthalenediol(92-44-4)
EPA Substance Registry System 2,3-Naphthalenediol (92-44-4)

Safety information for 2,3-Dihydroxynaphthalene

Signal word Danger
Pictogram(s)
ghs
Corrosion
Corrosives
GHS05
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H302:Acute toxicity,oral
H318:Serious eye damage/eye irritation
Precautionary Statement Codes P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P270:Do not eat, drink or smoke when using this product.
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.
P501:Dispose of contents/container to..…

Computed Descriptors for 2,3-Dihydroxynaphthalene

Related products of tetrahydrofuran

You may like

Statement: All products displayed on this website are only used for non medical purposes such as industrial applications or scientific research, and cannot be used for clinical diagnosis or treatment of humans or animals. They are not medicinal or edible.