Oxepan-4-one is primarily utilized in organic synthesis as a versatile intermediate for the production of various complex molecules. Its unique seven-membered ring structure makes it a valuable building block in the development of pharmaceuticals, particularly in the synthesis of compounds with potential therapeutic properties. Additionally, it serves as a key precursor in the creation of fine chemicals and specialty materials, where its reactivity can be harnessed to form diverse functional groups. In research, oxepan-4-one is often employed to study ring expansion reactions and to explore new pathways in synthetic organic chemistry. Its application extends to the field of polymer science, where it contributes to the development of novel polymeric materials with specific properties.