Used in organic synthesis as an intermediate for pharmaceuticals and bioactive compounds. Serves as a building block in the development of quinoline-based drugs, which may exhibit antimalarial, anticancer, or antimicrobial properties. The chloroethyl group allows for further alkylation or ring closure reactions, making it valuable in the design of heterocyclic molecules for medicinal chemistry research. Also employed in the preparation of fluorescent probes and dyes due to the inherent fluorescence of the quinoline scaffold.