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1,5-Dihydroxy naphthalene

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1,5-Dihydroxy naphthalene Basic information

Product Name:
1,5-Dihydroxy naphthalene
Synonyms:
  • Naphthalene-1,5-diol
  • 1,8-NAPHTHALENEDIMETHANOL
  • 1,5-DIHYDROXYNAPHTHALENE
  • 1,5-NAPHTHALENEDIOL
  • 1,5-Dihydroxynaphthalene 97%
  • 1,5-Dihydroxy phthalene
  • 1,5-Naphthalenediol for synthesis
  • 1,5-DihydroxynaphthaL
CAS:
83-56-7
MF:
C10H8O2
MW:
160.17
EINECS:
201-487-4
Product Categories:
  • Intermediates of Dyes and Pigments
  • Naphthalene derivatives
  • Indazoles
Mol File:
83-56-7.mol
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1,5-Dihydroxy naphthalene Chemical Properties

Melting point:
259-261 °C (dec.) (lit.)
Boiling point:
246.06°C (rough estimate)
Density 
1.0924 (rough estimate)
refractive index 
1.5418 (estimate)
Flash point:
252°C
storage temp. 
Inert atmosphere,Room Temperature
solubility 
0.6g/l
pka
9.28±0.40(Predicted)
form 
Solid
color 
Pale Beige to Very Dark Brown
PH
6 (0.5g/l, H2O, 20℃)
Water Solubility 
Soluble in water.
BRN 
2044951
CAS DataBase Reference
83-56-7(CAS DataBase Reference)
NIST Chemistry Reference
1,5-Naphthalenediol(83-56-7)
EPA Substance Registry System
1,5-Naphthalenediol (83-56-7)
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Safety Information

Hazard Codes 
Xn,N,Xi
Risk Statements 
22-51/53-36-36/37/38
Safety Statements 
22-24/25-61-39-29-26
WGK Germany 
2
RTECS 
QJ4740000
8-21
TSCA 
Yes
HS Code 
29072900

MSDS

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1,5-Dihydroxy naphthalene Usage And Synthesis

Chemical Properties

Grey powder

Uses

1,5-Dihydroxynaphthalene is an intermediate of synthetic mordant azo dyes. It is an intermediate used in organic synthesis, pharmaceuticals, dyestuff fields and photograph industry.

Purification Methods

The diol (~30g) is purified by making into a thick paste with H2O and suspending this in 3L of H2O containing 200mL of EtOH, boiling under reflux for 3hours, cooling to 30o, saturating with SO2, digesting below the boiling point for 1hour and filtering fast through a large hot filter paper. The hot filtrate is poured onto crushed ice whereby the diol (15-20g) separates as colourless needles (m 258o) [Wheeler & Ergle J Am Chem Soc 52 4873 1930]. Recrystallise it from H2O or nitromethane under N2 to avoid oxidation. The dibenzoyl derivative has m 245o (from EtOH). The 5-methoxy-1-naphthol derivative [prepared from the diol in MeOH/HCl (1:30 weight to volume ratio) and set aside at 25o for 9-10days] crystallised from pet ether (m 135-136o) or from CH2Cl2/hexane (needles m 140o) [Bell & McCaffrey Aust J Chem 46 731 1993]. [Beilstein 6 I 477, 6 II 950, 6 III 5265, 6 IV 6554.]

1,5-Dihydroxy naphthalene Preparation Products And Raw materials

Preparation Products

Raw materials

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