Used as an intermediate in the synthesis of functionalized polymers and specialty resins, particularly in the development of high-performance coatings and adhesives. Its reactive chloropropyl group enables covalent attachment to various substrates, making it valuable in surface modification and crosslinking applications. Also employed in the preparation of fluorescent probes and dyes due to the isoindole core, which can enhance photostability and emission properties. Additionally, it serves as a building block in pharmaceutical research for designing novel bioactive molecules.