5-Methylhex-4-enoic acid is primarily utilized in the synthesis of various organic compounds, particularly in the production of fragrances and flavoring agents. Its unique structure makes it a valuable intermediate in creating aromatic molecules that mimic natural scents, often found in perfumes, cosmetics, and food products. Additionally, it serves as a building block in the development of pharmaceuticals, where it contributes to the formation of active ingredients in certain medications. Its application extends to research and development in organic chemistry, where it is used to study reaction mechanisms and develop novel chemical processes.