Used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It serves as a building block for heterocyclic compounds due to its bifunctional nature, featuring both aldehyde and chloro groups that enable sequential or selective reactions. Commonly employed in the synthesis of pyrrolidines and other nitrogen-containing rings through cyclization reactions with amines. Also utilized in the preparation of specialty polymers and as a reagent in research laboratories for developing bioactive molecules. Its reactivity allows for easy chain extension and functional group transformations, making it valuable in multi-step synthetic routes.