ChemicalBook > CAS DataBase List > 4,7-dihydroxynaphthalene-2-sulphonic acid
4,7-dihydroxynaphthalene-2-sulphonic acid
- Product Name
- 4,7-dihydroxynaphthalene-2-sulphonic acid
- CAS No.
- 6357-94-4
- Chemical Name
- 4,7-dihydroxynaphthalene-2-sulphonic acid
- Synonyms
- Einecs 228-759-5;1,6-Dihydroxy-3-naphthalenesulfonic acid;4,7-dihydroxynaphthalene-2-sulfonic acid;4,7-Dihydroxy-2-naphthalenesulfonic acid;4,7-dihydroxynaphthalene-2-sulphonic acid;2-Naphthalenesulfonic acid, 4,7-dihydroxy-
- CBNumber
- CB4899611
- Molecular Formula
- C10H8O5S
- Formula Weight
- 240.23
- MOL File
- 6357-94-4.mol
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4,7-dihydroxynaphthalene-2-sulphonic acid Chemical Properties,Usage,Production
Chemical Properties
4,7-Dihydroxynaphthalene-2-sulfonic acid [6357-94-4]. (2,5-dihydroxynaphthalene-7- sulfonic acid), dioxy J acid, C10H8O5S, Mr 240.2, is readily soluble in water; its sodium salt is much less soluble and is easily salted out. Amination with NH3– NaHSO3 yields J acid.
Uses
?Although not used as a precursor for J acid itself, 4,7-dihydroxynaphthalene-2-sulphonic acid can be used advantageously for the production of some N-substituted J acids.
Production Methods
2-Hydroxynaphthalene-5,7-disulfonic acidis heated with aqueous NaOH – KOH for 5 h at 175℃. The melt is poured into water and acidified with hydrochloric acid, and the precipitated solid is filtered off and washed with brine; the yield is 80 %.
4,7-dihydroxynaphthalene-2-sulphonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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