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Naphthalene-2-sulfonic acid

Basic information Safety Supplier Related

Naphthalene-2-sulfonic acid Basic information

Product Name:
Naphthalene-2-sulfonic acid
Synonyms:
  • 2-Naphthalenesulfonicacid,tri
  • BETA NAPTHALENE SULPHONATE
  • BETA-NAPHTHALENESULFONIC ACID
  • 2-Naphthalenesulfoni
  • 2-Naphthalenesulfonic Acid 
  • 2-Sulfonaphthalene
  • Dirinal NSK
  • 2-Naphthalenesulfonic Acid (β-Naphthalenesulfonic acid)
CAS:
120-18-3
MF:
C10H8O3S
MW:
208.23
EINECS:
204-375-3
Product Categories:
  • Intermediates of Dyes and Pigments
  • Imidazoles
  • Organic Building Blocks
  • Sulfonic/Sulfinic Acids
  • Sulfur Compounds
Mol File:
120-18-3.mol
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Naphthalene-2-sulfonic acid Chemical Properties

Melting point:
124 °C
Boiling point:
317.43°C (rough estimate)
Density 
1.44 g/cm
refractive index 
1.4998 (estimate)
solubility 
water: freely soluble(lit.)
pka
0.27±0.10(Predicted)
Water Solubility 
Soluble in water.
Sensitive 
Hygroscopic
Merck 
6377
CAS DataBase Reference
120-18-3(CAS DataBase Reference)
EPA Substance Registry System
2-Naphthalenesulfonic acid (120-18-3)
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Safety Information

Hazard Codes 
C,F
Risk Statements 
35-34-11
Safety Statements 
26-36/37/39-45-16
RIDADR 
UN 2583 8/PG 2
WGK Germany 
1
RTECS 
QK1225000
Hazard Note 
Corrosive
TSCA 
Yes
HazardClass 
8
PackingGroup 
III

MSDS

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Naphthalene-2-sulfonic acid Usage And Synthesis

Chemical Properties

Nondeliquescent, white plates.Soluble in water, alcohol, and ether. Combustible.

Uses

Starting point in the manufacture of β-naphthol, β-naphtholsulfonic acid, β-naphthylaminesulfonic acid, etc.

Definition

ChEBI: A naphthalenesulfonic acid in which the sulfo group is linked to position 2 of the naphthalene ring.

Purification Methods

Crystallise the acid from conc HCl. The S-benzylisothiuronium salt has m 192o (from aqueous EtOH). [Berger Acta Chem Scand 8 432 1954, Beilstein 11 H 171, 11 IV 527.]

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