| Identification | Back Directory | [Name]
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid | [CAS]
82-47-3 | [Synonyms]
8-Amino-5,7-disulfo-1-naphthol
8,1,5,7-Aminonaphtholdisulfonic acid
1-Amino-8-naphthol-2,4-disulfonic acid
8-Amino-1-hydroxy-5,7-disulfonaphthalene
4-amino-5-hydroxynaphthalene-1,3-disulfonicaci
1-AMino-8-naphthol-2,4-disulfonic acid(SS Acid)
4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid
1-Amino-8-hydroxynaphthalene-2,4-disulfonic acid
4-amino-5-hydroxynaphthalene-1,3-disulfonic acid
4-Amino-5-Hydorxy-1,3-Naphthalenedisulfonic Acid
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
4-azanyl-5-hydroxy-naphthalene-1,3-disulfonic acid
1,3-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-
82-47-3 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid ISO 9001：2015 REACH | [EINECS(EC#)]
201-425-6 | [Molecular Formula]
C10H9NO7S2 | [MDL Number]
MFCD00035727 | [MOL File]
82-47-3.mol | [Molecular Weight]
319.31 |
| Hazard Information | Back Directory | [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. | [Uses]
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. |
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