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Naphthionic acid

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Naphthionic acid Basic information

Product Name:
Naphthionic acid
Synonyms:
  • 4-AMINO-1-NAPHTHALENESULPHONICACID
  • 1-Naphthylamine-4-sulfonic acid, Naphthionic acid
  • 4-Amino-1-naphthalenesulfonic acid,98%
  • 4-Aminonaphthalene-1-sulfonic acid for synthesis
  • alpha-naphthylamine-p-sulfonicacid
  • Kyselina 1-naftylamin-4-sulfonova
  • Kyselina nafthionova
  • kyselina1-naftylamin-4-sulfonova
CAS:
84-86-6
MF:
C10H9NO3S
MW:
223.25
EINECS:
201-567-9
Product Categories:
  • Intermediates of Dyes and Pigments
  • Building Blocks
  • Chemical Synthesis
  • Organic Building Blocks
  • Sulfonic/Sulfinic Acids
  • Sulfur Compounds
Mol File:
84-86-6.mol
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Naphthionic acid Chemical Properties

Melting point:
≥300 °C(lit.)
Boiling point:
220°C (rough estimate)
Density 
1.67
refractive index 
1.5250 (estimate)
storage temp. 
Store below +30°C.
solubility 
Sparingly soluble in dichloromethane. Soluble in aqueous base.
pka
pK1: 2.81 (25°C)
Water Solubility 
309.9mg/L(20 ºC)
Merck 
14,6403
BRN 
1971299
CAS DataBase Reference
84-86-6(CAS DataBase Reference)
NIST Chemistry Reference
4-Amino-1-naphthalene sulfonic acid(84-86-6)
EPA Substance Registry System
4-Amino-1-naphthalenesulfonic acid (84-86-6)
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Safety Information

Hazard Codes 
C
Risk Statements 
34-22
Safety Statements 
26-36/37/39-45-25
RIDADR 
UN 2585 8/PG 3
WGK Germany 
3
RTECS 
QK1270000
TSCA 
Yes
HazardClass 
8
PackingGroup 
III
HS Code 
29214500

MSDS

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Naphthionic acid Usage And Synthesis

Chemical Properties

slightly greyish to beige powder and granules

Uses

Intermediate for azo dyes, e.g., Congo red.

Purification Methods

It crystallises from H2O as needles of the 0.5 hydrate. Salt solutions fluoresce strongly blue. The S-benzylisothiuronium salt has m 195o (from aqueous EtOH). [Beilstein 14 IV 2793.]

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