1-Hydroxynaphthalene-7-sulfonic acid
- CAS No.
- 20191-62-2
- Chemical Name:
- 1-Hydroxynaphthalene-7-sulfonic acid
- Synonyms
- 1-Hydroxynaphthalene-7-sulfonic acid;2-Naphthalenesulfonic acid, 8-hydroxy-
- CBNumber:
- CB42506742
- Molecular Formula:
- C10H8O4S
- Molecular Weight:
- 224.23
- MOL File:
- 20191-62-2.mol
- Modify Date:
- 2023/11/1 14:21:38
1-Hydroxynaphthalene-7-sulfonic acid Chemical Properties,Uses,Production
Chemical Properties
1-Hydroxynaphthalene-7-sulfonic acid [20191-62-2]. (8-hydroxynaphthalene-2- sulfonic acid), C10H8O4S, Mr 224.2, is very soluble in water, and most of its metal salts are also readily soluble. It couples with diazotized 4- nitroaniline to give the 2,4-disazo compound. Nitration gives 2,4-dinitro-1-naphthol-7-sulfonic acid, which was known as Flavianic acid when used as a yellow dye for wool.
Synthesis
1-Naphthol is sulfonated with concentrated sulfuric acid at 130℃ to give a mixture of 2,7- and 4,7-disulfonic acids. This mixture is difficult to separate, but dilution with water and heating the resulting dilute sulfuric acid solution at 120℃ for 30 min result in selective desulfonation in the 2- and 4-positions.
1-Hydroxynaphthalene-7-sulfonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
1-Hydroxynaphthalene-7-sulfonic acid Suppliers
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1-Hydroxynaphthalene-7-sulfonic acid
2-Naphthalenesulfonic acid, 8-hydroxy-
20191-62-2