1-Hydroxynaphthalene-8-sulfonic acid Chemical Properties

Density 

1.549

pka

0.05±0.40(Predicted)

CAS DataBase Reference

117-22-6(CAS DataBase Reference)

EPA Substance Registry System

1-Naphthalenesulfonic acid, 8-hydroxy- (117-22-6)

1-Hydroxynaphthalene-8-sulfonic acid Usage And Synthesis

Chemical Properties

1-Hydroxynaphthalene-8-sulfonic acid [117-22-6]. (8-hydroxynaphthalene-1-sulfonic acid), C10H8O4S, Mr 224.2, crystallizes as the monohydrate with mp 106℃. Sulfonation gives 1-hydroxynaphthalene-4,8-disulfonic acid, and alkali fusion with potassium hydroxide at 230℃ yields 1,8-dihydroxynaphthalene. Coupling with diazo compounds occurs in the 2- position.

Uses

The naphthosultone is usually satisfactory as an intermediate for further processing; however, for azo dye preparation the free naphthol must be used, for example, in C.I. Acid Black 54 and C.I. Acid Blue 158.

Production Methods

1-Aminonaphthalene-8-sulfonic acid is diazotized over 16 h at 50℃ and then heated to 80 ℃. After cooling, the precipitated naphthosultone is filtered off and washed. The sultone is heated with dilute sodium hydroxide at 100℃, which causes ring opening; the product is isolated after salting out.

1-Hydroxynaphthalene-8-sulfonic acid(117-22-6)Related Product Information

• 1-NAPHTHOL-3,6,8-TRISULFONIC ACID TRISODIUM SALT
• 1-NAPHTHOL-3,8-DISULFONIC ACID DISODIUM SALT
• 1-Hydroxynaphthalene-8-sulfonic acid
• 5-Hydroxy-1-naphthalenesulfonic acid sodium salt
• J acid
• 1-Hydroxynaphthalene-5-sulfonic acid sodium salt,5-Hydroxynaphthalene-1-sulfonic acid sodium salt
• 1-NAPHTHOL-8-SULFONIC ACID SODIUM SALT
• 1-NAPHTHOL-3,8-DISULFONIC ACID
• 1-HYDROXYNAPHTHALENE-2-SULFONIC ACID POTASSIUM SALT
• Mordant Red 7
• 7-Hydroxynaphthalene-2-sulfonic acid sodium salt
• 6-Hydroxynaphthalene-2-sulfonic acid sodium salt
• 6-Nitro-1-diazo-2-naphthol-4-sulfonic acid
• 6,7-Dihydroxynaphthalene-2-sulfonic acid
• Sunset Yellow FCF
• 7-Hydroxynaphthalene-1-sulfonic acid potassium salt
• 6-amino-7-hydroxynaphthalene-2-sulphonic acid
• 2,3-Dihydroxynaphthalene-6-sulfonic acid