Used as a key intermediate in organic synthesis, particularly in the preparation of pyridine-based pharmaceuticals and agrochemicals. Its quaternary pyridinium structure makes it suitable for nucleophilic substitution reactions, where the iodide acts as a leaving group. It is also employed in the development of ionic liquids and as a precursor in the synthesis of N-heterocyclic compounds with biological activity. Additionally, it finds use in electrochemical applications due to its stable charged ring system.