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ORANGE I

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ORANGE I Basic information

Product Name:
ORANGE I
Synonyms:
  • 1333orange
  • 4-((4-hydroxy-1-naphthalenyl)azo)benzenesulfonicacid,monosodiumsalt
  • 4-((4-hydroxy-1-naphthalenyl)azo)-benzenesulfonicacimonosodiumsalt
  • 4-((4-hydroxy-1-naphthalenyl)azo)benzenesulphonicacid,monosodiumsalt
  • 4-[(4-hydroxy-1-naphthalenyl)azo]-benzenesulfonicacimonosodiumsalt
  • 4-p-sulfophenylazo-1-naphtholmonosodiumsalt
  • 4-p-sulphophenylazo-1-naphthol,monosodiumsalt
  • a.f.orangeno.1
CAS:
523-44-4
MF:
C16H11N2NaO4S
MW:
350.32
EINECS:
208-346-6
Product Categories:
  • Organics
Mol File:
523-44-4.mol
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ORANGE I Chemical Properties

Melting point:
260 °C (decomp)
storage temp. 
Inert atmosphere,Room Temperature
solubility 
DMSO (Slightly), Methanol (Slightly)
form 
Solid
Colour Index 
14600
color 
Red to Very Dark Red
Merck 
14,6857
BRN 
3826844
IARC
3 (Vol. 8, Sup 7) 1987
EPA Substance Registry System
C.I. Acid Orange 20 monosodium salt (523-44-4)
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Safety Information

Safety Statements 
22-24/25
WGK Germany 
3
RTECS 
DB7085000
HS Code 
32041200
Hazardous Substances Data
523-44-4(Hazardous Substances Data)
Toxicity
LD50 intraperitoneal in rat: 1gm/kg
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ORANGE I Usage And Synthesis

Chemical Properties

Crystalline

Uses

A labeled form of alpha-Naphthol Orange, also known as Acid Orange 20, which is an organic azo dye.

Definition

ChEBI: CI Acid Orange 20 is an organic molecular entity.

Preparation

4-Aminobenzenesulfonic acid diazo, and Naphthalen-1-ol?coupling.

Properties and Applications

orange. Soluble in water for palm light orange, slightly soluble in ethanol, acetone, insoluble in most organic solvents. The strong sulfuric acid for purple, diluted into palm orange, red with purple precipitation. Its water solution to join strong hydrochloric acid for orange brown; Add sodium hydroxide in red. Used for wool, silk fiber dyeing, etc. Also used in leather dyeing and indicator.

Purification Methods

Purify the dye by dissolving it in the minimum volume of H2O, adding, with stirring, a large excess of EtOH. The salt separates as orange needles. It is collected by centrifugation or filtration, washed with absolute EtOH (3x) and Et2O (2x) in the same way and dried in a vacuum desiccator over KOH. The free acid can be recrystallised from EtOH. [Slotta & Franke Chem Ber 64 86 1931, Beilstein 16 H 275, 16 II 117, 16 IV 410.] The purity can be checked by titration with titanium chloride [Klotz J Am Chem Soc 68 2299 1946].

ORANGE ISupplier

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