How is 4-Fluoropicolinic acid (CAS: 886371-78-4) typically synthesized?

4-Fluoropicolinic acid is usually synthesized by the fluorination of picolinic acid using reagents such as fluorine gas or hydrogen fluoride in the presence of a suitable catalyst, often a transition metal like copper. The reaction is typically conducted under anhydrous conditions and requires careful control of reaction temperature and pressure to achieve high yield and selectivity.