4-aminonaphthalene-1,7-disulfonic acid

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Products Intro: Product Name:4-Aminonaphthalene-1,7-disulfonic acid
CAS:85-74-5
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CAS:85-74-5
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CAS:85-74-5
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4-aminonaphthalene-1,7-disulfonic acid Basic information
Product Name:4-aminonaphthalene-1,7-disulfonic acid
Synonyms:4-aminonaphthalene-1,7-disulphonic acid;DAHLSACIDII;4-amino-1,7-naphthalenedisulfonic acid;4-azanylnaphthalene-1,7-disulfonic acid;1-naphthylamine-4,6-disulfonic acid;4-aminonaphthalene-1,7-disulfonic acid;1,7-Naphthalenedisulfonic acid, 4-amino-
CAS:85-74-5
MF:C10H9NO6S2
MW:303.31
EINECS:201-629-5
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Mol File:85-74-5.mol
4-aminonaphthalene-1,7-disulfonic acid Structure
4-aminonaphthalene-1,7-disulfonic acid Chemical Properties
Boiling point 205.8°C (rough estimate)
density 1.6329 (rough estimate)
refractive index 1.7330 (estimate)
pka-0.84±0.40(Predicted)
EPA Substance Registry System1,7-Naphthalenedisulfonic acid, 4-amino- (85-74-5)
Safety Information
RIDADR 1759
TSCA TSCA listed
HazardClass 8
PackingGroup III
MSDS Information
4-aminonaphthalene-1,7-disulfonic acid Usage And Synthesis
Description1-Aminonaphthalene-4,6-disulfonic acid [85-74-5]. (4-aminonaphthalene-1,7-disulfonic acid), Dahl’s acid II, C10H9NO6S2, Mr 303.3, and its alkali-metal salts are soluble in water; the calcium salt is soluble in aqueous ethanol. Caustic fusion at 180℃ yields 1-amino-6-hydroxynaphthalene-4-sulfonic acid, but at higher temperature 4,7-dihydroxynaphthalene1-sulfonic acid is formed. Sulfonation with 35 % oleum at 80℃ gives 1-aminonaphthalene-2,4,6-trisulfonic acid.
PreparationNaphthionic acid is sulfonated with 25 % oleum at 20℃ to give a 70 : 30 mixture of 1,4,7- and 1,4,6-trisulfonic acids, which is used as mixed Dahl’s acids.
4-aminonaphthalene-1,7-disulfonic acid Preparation Products And Raw materials
Preparation Products1,-Naphthalenedisulfonic acid, 4,4'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis-, tetrasodium salt
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