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)

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

F 

8-21

TSCA 

Yes

HS Code 

29072900

MSDS

• Language:English Provider:1,5-Dihydroxy naphthalene
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

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.]

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