1-Ethyl-3-fluorobenzene is primarily used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Its structure allows for further functionalization, making it valuable in the development of active pharmaceutical ingredients (APIs) and other complex organic compounds. Additionally, it serves as a building block in the synthesis of specialty chemicals, where its fluorinated aromatic ring contributes to the desired properties of the final product, such as enhanced stability or specific reactivity. In research, it is often employed in studies focusing on fluorinated aromatic compounds to explore their behavior in various chemical reactions.