Sulfuric Acid → 3-Hydroxy-2-naphthoic acid
Reaktionsgleichung
[OH:1][C:2]1[C:11]([C:12]([O-:14])=[O:13])=[CH:10][C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]=1.[Na+].S(=O)(=O)(O)O>>[OH:1][C:2]1[C:11]([C:12]([OH:14])=[O:13])=[CH:10][C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]=1Komponenten
3
Reaktionsbedingungen
- Temperatur
- 160 °C
Versuchsvorschrift
To a 1 L autoclave, 800 g of aqueous solution containing 100 g of sodium 2-hydroxynaphthalene-3-carboxylate prepared by means of the Kolbe-Schmitt method was fed and heated to 160° C. An aqueous sulfuric acid solution (72%) was added dropwise to the solution over 50 minutes to adjust the pH of the mixture to 3.5. Then, the mixture was cooled to 80° C. at the rate of 0.4° C./min. At the same temperature, the mixture was filtrated to give 80.6 g of crystalline 2-hydroxynaphthalene-3-carboxylic acid.