ChemicalBook > Product Catalog > Organic Chemistry > Hydrocarbons and derivatives > Aromatic hydrocarbons > 1-hydroxynaphthalene-2-sulphonic acid
1-hydroxynaphthalene-2-sulphonic acid
1-hydroxynaphthalene-2-sulphonic acid Basic information
- Product Name:
- 1-hydroxynaphthalene-2-sulphonic acid
- Synonyms:
-
- 1-hydroxynaphthalene-2-sulphonic acid
- 1-NAPHTHOL-2-SULPHONICACID
- 1-Hydroxy
- 1-Hydroxy-2-naphthalenesulfonic acid
- 1-Hydroxynaphthalene-2-sulfonic acid
- 2-Naphthalenesulfonic acid, 1-hydroxy-
- CAS:
- 567-18-0
- MF:
- C10H8O4S
- MW:
- 224.23
- EINECS:
- 209-303-4
- Mol File:
- 567-18-0.mol
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1-hydroxynaphthalene-2-sulphonic acid Chemical Properties
- Melting point:
- >249.85°C
- Boiling point:
- 335.63°C (rough estimate)
- Density
- 1.4643 (rough estimate)
- refractive index
- 1.6000 (estimate)
- pka
- 0.10±0.40(Predicted)
- EPA Substance Registry System
- 2-Naphthalenesulfonic acid, 1-hydroxy- (567-18-0)
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1-hydroxynaphthalene-2-sulphonic acid Usage And Synthesis
Chemical Properties
1-Hydroxynaphthalene-2-sulfonic acid [567-18-0]. Baum’s acid, C10H8O4S, Mr 224.23, is sparingly soluble in water and is precipitated from aqueous solution by hydrochloric acid. Coupling with diazo compounds and nitrosation both take place in the 4-position. Sulfonation gives 1-naphthol-2,4-disulfonic acid and nitration gives 2,4-dinitro-1-naphthol.
Preparation
The reaction of 1-naphthol with oleum in the cold yields a mixture of the 2- and 4- sulfonic acids; the former may be separated from the aqueous quenched reaction mixture by salting out the potassium salt after removing unreacted 1-naphthol.