4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
- CAS NO.：82-47-3
- Empirical Formula: C10H9NO7S2
- Molecular Weight: 319.31
- MDL number: MFCD00035727
- EINECS: 201-425-6
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-12-31 14:38:37
What is 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid?
Chemical properties
1-Amino-8-hydroxynaphthalene-2,4-disulfonic acid [82-47-3]. (4-amino-5-hydroxynaphthalene-1,3-disulfonic acid), Chicago acid, 2 S acid, C10H9NO7S2, Mr 319.3, and its acid sodium salt are readily soluble in water; the latter can be salted out with sodium chloride. In alkaline solution, coupling with diazo compounds takes place ortho to the hydroxyl group. Alkaline hydrolysis at 170℃ gives 1,8-dihydroxynaphthalene-2,4-disulfonic acid. Heating with dilute sulfuric acid results in desulfonation to give 1-amino-8-hydroxynaphthalene-2-sulfonic acid.
The Uses of 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
Chicago acid is used as a coupling component for C.I. Direct Blue 1, C.I. Direct Blue 22, and C.I. Direct Blue 76 (the dicopper complex of demethylated).
Production Methods
A solution of the disodium salt of naphthosultam-2,4-disulfonic acid is concentrated and mixed with potassium hydroxide liquor at 130℃. The temperature is raised to 155℃ over 20 h to complete the reaction. After being cooled and diluted with water, the melt is run into excess hydrochloric acid and the monopotassium salt is collected by filtration at 30℃ and slurry washed with recycling of the wash liquors. A yield of 87 % is obtained.
Properties of 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
| EPA Substance Registry System | 1,3-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- (82-47-3) |
Safety information for 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
Computed Descriptors for 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid manufacturer
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