Used primarily as an intermediate in organic synthesis, especially in the preparation of heterocyclic compounds. It participates in condensation reactions to form pyridines, pyrimidines, and other nitrogen-containing rings, which are common structures in pharmaceuticals and agrochemicals. Also employed in the synthesis of dyes and fluorescent probes due to its reactivity with amines and other nucleophiles. Its electrophilic nature makes it useful in constructing carbon-chain frameworks in fine chemical manufacturing.