How is 1-Bromo-3-hydroxynaphthalene (CAS: 5498-31-7) typically synthesized?

1-Bromo-3-hydroxynaphthalene (CAS: 5498-31-7) is typically synthesized by the Brönsted oxidation of 3-hydroxynaphthalene using fuming sulfuric acid in the presence of acetic anhydride. The reaction is carried out under anhydrous conditions to prevent side reactions. The yield is usually around 70-80%, and the product is isolated by recrystallization from ethanol or acetone. This method provides a high degree of selectivity for the bromination of the hydroxyl group.