2-(Ethenesulfonyl)benzonitrile is primarily used as a key intermediate in organic synthesis, particularly in the development of pharmaceuticals and agrochemicals. Its structure, featuring both a sulfonyl and a nitrile group, makes it a versatile building block for constructing more complex molecules. It is often employed in the synthesis of heterocyclic compounds, which are crucial in drug discovery for their biological activity. Additionally, it can be utilized in the preparation of polymers and specialty chemicals, where its reactivity allows for modifications to enhance material properties. Its role in cross-coupling reactions also makes it valuable in creating advanced organic materials.