How is 4-Bromo-2-formylbenzoic acid (CAS: 871502-87-3) typically synthesized?

4-Bromo-2-formylbenzoic acid is typically synthesized through the bromination of 2-formylbenzoic acid followed by a protective group modification if necessary. Common methods include using bromine in the presence of a suitable solvent like dichloromethane. The reaction yields a bromo derivative, which can be further functionalized as required. This synthesis involves careful control of reaction conditions to achieve the desired selectivity and yield.