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2-Aminonaphthalene-1-sulfonic acid

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2-Aminonaphthalene-1-sulfonic acid Basic information

Product Name:
2-Aminonaphthalene-1-sulfonic acid
Synonyms:
  • SUPER J ACID
  • 2 NAPHTHYLAMINE SULPHONIC ACID
  • 2-NAPHTHYLAMINE-1-SULFONIC ACID
  • 2-AMINO-1-NAPHTHALENESULFONIC ACID
  • 2-AMINONAPHTHALENE-1-SULFONIC ACID
  • TOBIAS ACID
  • 1-Naphthalenesulfonic acid, 2-amino-
  • 1-Naphthalenesulfonicacid,2-amino-
CAS:
81-16-3
MF:
C10H9NO3S
MW:
223.25
EINECS:
201-331-5
Product Categories:
  • Organics
  • Intermediates
  • Intermediates of Dyes and Pigments
Mol File:
81-16-3.mol
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2-Aminonaphthalene-1-sulfonic acid Chemical Properties

Melting point:
180 °C
Boiling point:
220°C (rough estimate)
Density 
1.3588 (rough estimate)
refractive index 
1.5250 (estimate)
pka
pK1: 2.35 (25°C)
Water Solubility 
4.083g/L(20 ºC)
Merck 
14,6406
BRN 
613084
CAS DataBase Reference
81-16-3(CAS DataBase Reference)
NIST Chemistry Reference
2-Naphthylamine-1-sulfonic acid(81-16-3)
EPA Substance Registry System
2-Amino-1-naphthalenesulfonic acid (81-16-3)
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Safety Information

Risk Statements 
36/37/38-40
Safety Statements 
26-36/37/39
RIDADR 
2585
WGK Germany 
1
RTECS 
QK1250000
TSCA 
Yes
HazardClass 
8
PackingGroup 
III
Hazardous Substances Data
81-16-3(Hazardous Substances Data)

MSDS

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2-Aminonaphthalene-1-sulfonic acid Usage And Synthesis

Chemical Properties

Grey white to light pink powder

Uses

Azo dye intermediate, optical brighteners.

Purification Methods

Crystallise the acid under nitrogen from boiling water and dry it in a steam oven [Bryson Trans Faraday Soc 47 522, 527 1951]. [Beilstein 14 III 2240, 14 IV 2792.]

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