Used as a key intermediate in organic synthesis, particularly in the preparation of functionalized heterocyclic compounds. Its alkyne functionality enables click chemistry reactions, such as copper-catalyzed azide-alkyne cycloaddition (CuAAC), making it valuable in pharmaceutical research and development of bioactive molecules. Commonly employed in the synthesis of fluorescent probes and labeled biomolecules due to the ease of modifying the isoindoline dione ring. Also finds use in polymer chemistry for creating cross-linked networks and functional materials through alkyne-based coupling reactions.