Allyl ethyl ether is primarily used as a chemical intermediate in organic synthesis. It is often employed in the production of various polymers and resins, where its reactive allyl group facilitates polymerization processes. Additionally, it serves as a precursor in the synthesis of specialty chemicals, including flavoring agents and fragrances, due to its ability to introduce allyl groups into target molecules. In some cases, it is also utilized in the development of pharmaceuticals and agrochemicals, where its ether functionality can be modified to create biologically active compounds. Its applications are driven by its reactivity and versatility in forming complex chemical structures.