Used primarily as a reactive intermediate in organic synthesis, this acyl chloride derivative enables the introduction of a hex-5-ynoate group into various molecules. Its terminal alkyne functionality allows participation in click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC), making it valuable in bioconjugation and pharmaceutical research. It is employed in the preparation of functionalized polymers, peptide modifications, and synthesis of probe molecules for biochemical labeling. Due to its sensitivity to moisture, it is typically handled under anhydrous conditions in the presence of inert atmosphere.