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1,8-Dihydroxynaphthylene-3,6-disulfonic acid

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1,8-Dihydroxynaphthylene-3,6-disulfonic acid Basic information

Product Name:
1,8-Dihydroxynaphthylene-3,6-disulfonic acid
Synonyms:
  • 4,5-dihydroxy-7-naphthalenedisulfonicacid
  • 7-Naphthalenedisulfonicacid,4,5-dihydroxy-2
  • Chrmotropicacid
  • 8-Dihydroxynaphthylene-3
  • 4,5-Dihydroxy-2,7-naphthalene disulfonic acid 1,8-Dihydroxynaph-thalene-3,6-disulfonic acid
  • 4,5-DIHYDROXY-2,7-NAPHTHALENEDISULFONIC ACID
  • 4,5-dihydroxynaphthalene-2,7-disulphonic acid
  • 1,8-DIHYDROXYNAPHTHALENE-3,6-DISULFONIC ACID
CAS:
148-25-4
MF:
C10H8O8S2
MW:
320.3
EINECS:
205-712-7
Product Categories:
  • Intermediates of Dyes and Pigments
Mol File:
148-25-4.mol
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1,8-Dihydroxynaphthylene-3,6-disulfonic acid Chemical Properties

Boiling point:
429.2°C (rough estimate)
Density 
1.7929 (rough estimate)
refractive index 
1.6000 (estimate)
storage temp. 
Inert atmosphere,Room Temperature
pka
-0.51±0.40(Predicted)
CAS DataBase Reference
148-25-4(CAS DataBase Reference)
EPA Substance Registry System
2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy- (148-25-4)
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Safety Information

HS Code 
29089990

MSDS

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1,8-Dihydroxynaphthylene-3,6-disulfonic acid Usage And Synthesis

Chemical Properties

4,5-Dihydroxynaphthalene-2,7-disulfonic acid [148-25-4]. (1,8-dihydroxynaphthalene-3,6-disulfonic acid), chromotropic acid, C10H8O8S2, Mr 320.3: the disodium salt is readily soluble in water. Alkali fusion yields 1,3,8-trihydroxynaphthalene-6-sulfonic acid. Diazo coupling occurs in the 3- and 6-positions.

Uses

Chromotropic acid is used as an analytical reagent and as a coupling component for a wide range of azo dyes, e.g., C.I. Acid Violet 6, C. I. Mordant Blue 13, and C.I. Direct Blue 84.

Definition

ChEBI: A naphthalenesulfonic acid that is naphthalene-2,7-disulfonic acid substituted by hydroxy groups at positions 4 and 5.

Production Methods

2-Hydroxynaphthalene-3,6,8- trisulfonic acid total liquor is concentrated and heated with caustic soda liquor to 158℃ for 20 – 30 h . The melt is diluted with water and poured into excess hydrochloric acid. Salt is added, sulfur dioxide expelled, and the mixture cooled to precipitate the product as the disodium salt in 88 % yield.
An alternative process is based on direct fusion (caustic liquor at 228℃ under pressure) of 1-aminonaphthalene-3,6,8-trisulfonic acid to chromotropic acid without isolating the intermediate oxy Koch acid.

1,8-Dihydroxynaphthylene-3,6-disulfonic acid Preparation Products And Raw materials

Raw materials

Preparation Products

1,8-Dihydroxynaphthylene-3,6-disulfonic acidSupplier

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