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| 化学名: | 2-アミノ-1-ナフタレンスルホン酸 | | 英語化学名: | 2-Aminonaphthalene-1-sulfonic acid | | 别名: | SUPER J ACID;2 NAPHTHYLAMINE SULPHONIC ACID;2-NAPHTHYLAMINE-1-SULFONIC ACID;2-AMINO-1-NAPHTHALENESULFONIC ACID;2-AMINONAPHTHALENE-1-SULFONIC ACID;TOBIAS ACID;1-Naphthalenesulfonic acid, 2-amino-;1-Naphthalenesulfonicacid,2-amino- | | CAS番号: | 81-16-3 | | 分子式: | C10H9NO3S | | 分子量: | 223.25 | | EINECS: | 201-331-5 | | カテゴリ情報: | Organics;Intermediates;Intermediates of Dyes and Pigments | | Mol File: | 81-16-3.mol |  |
| | 2-アミノ-1-ナフタレンスルホン酸 Usage And Synthesis |
| 外観 | 白色～うすい黄色～うすい黄赤色粉末～結晶 | | 化学的特性 | Grey white to light pink powder. 2-Aminonaphthalene-1-sulfonic acid [81-16-3]. Tobias acid, C10H9NO3S, Mr 223.24, is sparingly soluble in water but the sodium salt is readily soluble. Coupling with diazo compounds takes place in the 1-position with elimination of the sulfonic acid group. | | 使用 | Azo dye intermediate, optical brighteners. Sulfonation with oleum gives 2-aminonaphthalene-1,5-disulfonic acid, which can be desulfonated to produce 2-aminonaphthalene-5- sulfonic acid. Tobias acid is used as a diazo component in acid dyes (e.g., C.I. Acid Yellow 19), red reactive dyes, and pigments such as the important Lithol Reds, [e.g., C.I. Pigment Red 49]. The free acid of C.I. Pigment Red 49 is also remarkably insoluble and can be used as a pigment. | | 使用 | 2-Amino-1-naphthalenesulfonic acid has been used in the preparation of 2-(2-naphthylamino)benzoxazole by reacting with 2-chlorobenzoxazole. | | 調製方法 | 2-Hydroxynaphthalene-1-sulfonic acid is heated with a mixture of ammonia and ammonium sulfite in an autoclave at 150 ℃ and 1 MPa for 30 h. The reaction mixture is added to a slurry of lime, and excess ammonia is driven off. Inorganic calcium salts are filtered off at 80℃, and the filtrate is acidified with hydrochloric acid at 40℃ to precipitate Tobias acid in 95 % yield. Care must be taken throughout the process to avoid desulfonation and formation of 2- naphthylamine. | | 一般的な説明 | 2-Amino-1-naphthalenesulfonic acid is a manufacturing intermediate in the monosulfo monoazo color additive D&C Red No. 34 and its lakes. | | 純化方法 | Crystallise the acid under nitrogen from boiling water and dry it in a steam oven [Bryson Trans Faraday Soc 47 522, 527 1951]. [Beilstein 14 III 2240, 14 IV 2792.] |
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