6,7-Dihydroxynaphthalene-2-sulfonic acid
6,7-Dihydroxynaphthalene-2-sulfonic acid Basic information
- Product Name:
- 6,7-Dihydroxynaphthalene-2-sulfonic acid
- Synonyms:
-
- 6,7-dihydroxynaphthalene-2-sulphonic acid
- 6,7-DIHYDROXYNAPHTHALENE-2-SULFONIC ACID
- 2-Naphthalenesulfonic acid, 6,7-dihydroxy-
- CAS:
- 92-27-3
- MF:
- C10H8O5S
- MW:
- 240.23
- EINECS:
- 202-142-0
- Product Categories:
-
- Intermediates of Dyes and Pigments
- Mol File:
- 92-27-3.mol
More
Less
6,7-Dihydroxynaphthalene-2-sulfonic acid Chemical Properties
- Density
- 1.677±0.06 g/cm3(Predicted)
- pka
- 0.35±0.40(Predicted)
- EPA Substance Registry System
- 2-Naphthalenesulfonic acid, 6,7-dihydroxy- (92-27-3)
More
Less
6,7-Dihydroxynaphthalene-2-sulfonic acid Usage And Synthesis
Chemical Properties
6,7-Dihydroxynaphthalene-2-sulfonic acid [92-27-3]. (2,3-dihydroxynaphthalene-6-sulfonic acid), dioxy R acid, C10H8O5S, Mr 240.2, is readily soluble in water. The sodium salt is sparingly soluble in cold water but readily soluble in hot water. Heating with dilute sulfuric acid at 190 C gives 2,3-dihydroxynaphthalene.
Production Methods
2-Hydroxynaphthalene-3,6- disulfonic acid is heated with 70 % caustic soda liquor for 4 h at 270℃, after which the reaction mixture is diluted with water and poured into excess hydrochloric acid. The precipitated product is filtered off and washed with brine; the yield is 90 %.