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| | 7-hydroxynaphthalene-2-sulphonic acid Basic information |
| Product Name: | 7-hydroxynaphthalene-2-sulphonic acid | | Synonyms: | 7-hydroxynaphthalene-2-sulphonic acid;2-Naphthol-7-sulfonic acid;2-Hydroxynaphthalene-7-sulfonicacid;2-Hydroxy-7-naphthalenesulfonic acid;7-Hydroxynaphthalene-2-sulfonic acid;2-Naphthalenesulfonic acid, 7-hydroxy-;(4Z)-4-(phenylmethylene)oxolane-2,3-dione;2-Hydroxynaphthlene-7-sulfonic acid | | CAS: | 92-40-0 | | MF: | C10H8O4S | | MW: | 224.23 | | EINECS: | 202-153-0 | | Product Categories: | | | Mol File: | 92-40-0.mol |  |
| | 7-hydroxynaphthalene-2-sulphonic acid Chemical Properties |
| RIDADR | 1759 | | HazardClass | 8 | | PackingGroup | III |
| | 7-hydroxynaphthalene-2-sulphonic acid Usage And Synthesis |
| Chemical Properties | 2-Hydroxynaphthalene-7-sulfonic acid [92- 40-0]. (7-hydroxynaphthalene-2-sulfonic acid), F acid, Cassella acid, C10H8O4S, Mr 224.23, is soluble in water, from which it can be recrystallized as the monohydrate (mp 89℃). The sodium and potassium salts are also readily soluble, but the barium salt is sparingly soluble. Iron(III) chloride gives a dark blue color with neutral solutions of 2-Hydroxynaphthalene-7-sulfonic acid. Azo coupling and nitrosation occurs in the 1-position. Sulfonation gives a variety of products depending on the conditions. | | Uses | 2-Hydroxynaphthalene-7-sulfonic acid is used as an intermediate in the production of 2-aminonaphthalene-7-sulfonic acid, 2-hydroxynaphthalene-3,7-disulfonic acid, and 2,7-dihydroxynaphthalene. It has minor uses as an azo coupling component. | | Preparation | Naphthalene-2,7-disulfonic acid is heated with aqueous sodium hydroxide under pressure at 230℃ for 5 h and then at 260℃ for another 5 h. After neutralizing and screening, the liquor is acidified to precipitate the product, which is isolated after boiling off the sulfur dioxide and cooling to 30℃. |
| | 7-hydroxynaphthalene-2-sulphonic acid Preparation Products And Raw materials |
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