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| | 1-NAPHTHOL-3,8-DISULFONIC ACID Basic information |
| Product Name: | 1-NAPHTHOL-3,8-DISULFONIC ACID | | Synonyms: | 1-NAPHTHOL-3,8-DISULFONIC ACID;8-Hydroxynaphthalene-1,6-Disulfonic Acid;8-hydroxynaphthalene-1,6-disulphonic acid;Epsilon acid;8phydroxynaphthalene-1,6-disulfonic acid;8-Hydroxy-1,6-naphthalenedisulfonic acid;Disulfo acid E;4-Hydroxy-2,5-naphthalenedisulfonic acid | | CAS: | 117-43-1 | | MF: | C10H8O7S2 | | MW: | 304.3 | | EINECS: | 204-189-2 | | Product Categories: | Intermediates of Dyes and Pigments | | Mol File: | 117-43-1.mol |  |
| | 1-NAPHTHOL-3,8-DISULFONIC ACID Chemical Properties |
| | 1-NAPHTHOL-3,8-DISULFONIC ACID Usage And Synthesis |
| Chemical Properties | White, crystalline scales. Soluble in hot water. 1-Hydroxynaphthalene-3,8-disulfonic acid [117-43-1]. (8-hydroxynaphthalene-1,6- disulfonic acid), epsilon acid, C10H8O7S2, Mr 304.3: the sodium salt crystallizes as the hexahydrate and is readily soluble in water. Alkali fusion at 200 ℃ gives 1,8-dihydroxynaphthalene-3-sulfonic acid and amination with ammonia and ammonium chloride at 170℃ gives 6,8-diaminonaphthalene-1-sulfonic acid. Diazo coupling takes place in the 2-position and bromination in the 4-position. The 1,8-sultone is formed on dehydration with concentrated sulfuric acid. | | Uses | Azo-dye intermediate. | | Production Methods | The acid sodium salt of 1-aminonaphthalene-3,8-disulfonic acid is hydrolyzed by heating with water under pressure at 180℃. |
| | 1-NAPHTHOL-3,8-DISULFONIC ACID Preparation Products And Raw materials |
| Raw materials | 8-Aminonaphthalene-1,6-disulfonic acid-->Water-->Sulfuric acid | | Preparation Products | 1,6-Naphthalenedisulfonic acid, 8-hydroxy-7-[[4-(6-methyl-2-benzothiazolyl)phenyl]azo]-, disodium salt-->1,6-Naphthalenedisulfonic acid, 7-[[4'-[(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-8-hydroxy-, trisodium salt-->Acid Red 21-->4-Hydroxy-3-[[4'-[(2-hydroxy-8-sodiosulfo-1-naphthalenyl)azo]-1,1'-biphenyl-4-yl]azo]naphthalene-2,5-disulfonic acid disodium salt-->DIRECT BLUE 98-->1,6-Naphthalenedisulfonic acid, 7-[[4-(4,6-dimethyl-2-benzothiazolyl)-2-methylphenyl]azo]-8-hydroxy-, disodium salt-->tetrasodium [mu-[[7,7'-[(3,3'-dihydroxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[8-hydroxynaphthalene-1,6-disulphonato]](8-)]]dicuprate(4-)-->C.I.Direct Blue 30-->1,6-Naphthalenedisulfonic acid, 8-hydroxy-7-[[4-[[4'-[(1-hydroxy-3,8-disulfo-2-naphthalenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-1-naphthalenyl]azo]-, tetrasodium salt-->Acid Blue 154-->Direct Sky Blue FB |
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