Used as a reagent in organic synthesis, particularly in the preparation of pyridinium salts and other heterocyclic compounds. It serves as an electrophilic agent in aromatic substitution reactions, enabling the introduction of oxygen-containing ring systems. Also employed in the development of fluorescent dyes and sensors due to its ability to form conjugated structures upon reaction with nucleophiles. Its stability and reactivity make it valuable in pharmaceutical research for building complex aromatic frameworks.