4-aminonaphthalene-1,6-disulfonic acid
4-aminonaphthalene-1,6-disulfonic acid Basic information
- Product Name:
- 4-aminonaphthalene-1,6-disulfonic acid
- Synonyms:
-
- 1-naphthylamine-4,7-disulfonic acid
- 4-aminonaphthalene-1,6-disulfonic acid
- 4-azanylnaphthalene-1,6-disulfonic acid
- 4-aminonaphthalene-1,6-disulphonic acid
- 4-Amino-1,6-naphthalenedisulfonic acid
- Dahl's acid III
- 1,6-Naphthalenedisulfonic acid, 4-amino-
- CAS:
- 85-75-6
- MF:
- C10H9NO6S2
- MW:
- 303.31
- EINECS:
- 201-630-0
- Mol File:
- 85-75-6.mol
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4-aminonaphthalene-1,6-disulfonic acid Chemical Properties
- Boiling point:
- 205.8°C (rough estimate)
- Density
- 1.6329 (rough estimate)
- refractive index
- 1.7330 (estimate)
- EPA Substance Registry System
- 1,6-Naphthalenedisulfonic acid, 4-amino- (85-75-6)
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4-aminonaphthalene-1,6-disulfonic acid Usage And Synthesis
Description
1-Aminonaphthalene-4,7-disulfonic acid [85-75-6]. (4-aminonaphthalene-1,6-disulfonic acid), Dahl’s acid III, C10H9NO6S2, Mr 303.3, and its sodium salt are readily soluble in water, but the calcium and barium salts are only sparingly soluble. Conversion to 1-hydroxynaphthalene-4,7-disulfonic acid is achieved by reverse-Bucherer reaction or diazotization and hydrolysis. Sulfonation (35 % oleum, 90℃) yields 1-aminonaphthalene-2,4,7-trisulfonic acid.
Production Methods
?Although separation of 4-aminonaphthalene-1,6-disulfonic acid from the mixture obtained by sulfonation of naphthionic acid is not practicable on a large scale, the 1,4,7-isomer can be obtained directly in high yield by sulfonation of 1-aminonaphthalene-7-sulfonic acid with oleum.