| Identification | Back Directory | [Name]
4-aminonaphthalene-1,7-disulfonic acid | [CAS]
85-74-5 | [Synonyms]
DAHLSACIDII
1-naphthylamine-4,6-disulfonic acid
4-aminonaphthalene-1,7-disulfonic acid
4-amino-1,7-naphthalenedisulfonic acid
4-azanylnaphthalene-1,7-disulfonic acid
4-aminonaphthalene-1,7-disulphonic acid
1,7-Naphthalenedisulfonic acid, 4-amino- | [EINECS(EC#)]
201-629-5 | [Molecular Formula]
C10H9NO6S2 | [MDL Number]
MFCD00021550 | [MOL File]
85-74-5.mol | [Molecular Weight]
303.31 |
| Hazard Information | Back Directory | [Description]
1-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. | [Preparation]
Naphthionic 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. |
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