Glutaryl chloride is primarily used as a key intermediate in organic synthesis, particularly in the production of polymers and pharmaceuticals. It is employed in the preparation of polyesters and polyamides, where it acts as a cross-linking agent to enhance the material's strength and durability. In the pharmaceutical industry, it serves as a reagent for synthesizing active pharmaceutical ingredients (APIs) and other bioactive compounds. Additionally, glutaryl chloride is utilized in the modification of peptides and proteins, enabling the creation of specialized biomolecules for research and therapeutic purposes. Its reactivity with various functional groups makes it a versatile compound in chemical manufacturing processes.