7-hydroxynaphthalene-2-sulphonic acid
- Product Name
- 7-hydroxynaphthalene-2-sulphonic acid
- CAS No.
- 92-40-0
- Chemical Name
- 7-hydroxynaphthalene-2-sulphonic acid
- Synonyms
- 2-Naphthol-7-sulfonic acid;2-Hydroxynaphthlene-7-sulfonic acid;2-Hydroxynaphthalene-7-sulfonicacid;7-Hydroxynaphthalene-2-sulfonic acid;2-Hydroxy-7-naphthalenesulfonic acid;7-hydroxynaphthalene-2-sulphonic acid;2-Naphthalenesulfonic acid, 7-hydroxy-;(4Z)-4-(phenylmethylene)oxolane-2,3-dione
- CBNumber
- CB7939158
- Molecular Formula
- C10H8O4S
- Formula Weight
- 224.23
- MOL File
- 92-40-0.mol
7-hydroxynaphthalene-2-sulphonic acid Property
- Density
- 1.549±0.06 g/cm3(Predicted)
- pka
- 0.21±0.40(Predicted)
- EPA Substance Registry System
- 2-Naphthalenesulfonic acid, 7-hydroxy- (92-40-0)
Safety
- RIDADR
- 1759
- HazardClass
- 8
- PackingGroup
- III
7-hydroxynaphthalene-2-sulphonic acid Chemical Properties,Usage,Production
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
Raw materials
Preparation Products
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