How is 4-fluoropyridine (CAS: 694-52-0) typically synthesized?

4-Fluoropyridine (CAS: 694-52-0) is often synthesized via the nitration of pyridine followed by reduction of the nitrated product. Alternatively, it can be prepared by chlorination of pyridine and subsequent reduction. The synthesis typically requires the use of concentrated sulfuric acid as a catalyst and involves careful control of reaction conditions to achieve high selectivity and yield.