| Identification | Back Directory | [Name]
4,7-dihydroxynaphthalene-2-sulphonic acid | [CAS]
6357-94-4 | [Synonyms]
Einecs 228-759-5
4,7-Dihydroxy-2-naphthalenesulfonic acid
4,7-dihydroxynaphthalene-2-sulfonic acid
1,6-Dihydroxy-3-naphthalenesulfonic acid
4,7-dihydroxynaphthalene-2-sulphonic acid
2-Naphthalenesulfonic acid, 4,7-dihydroxy- | [EINECS(EC#)]
228-759-5 | [Molecular Formula]
C10H8O5S | [MOL File]
6357-94-4.mol | [Molecular Weight]
240.23 |
| Hazard Information | Back Directory | [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 %. |
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