Used primarily as a reactive intermediate in organic synthesis, especially in the production of specialty polymers and resins. Its vinyl and chlorine groups allow for polymerization and further chemical modifications, making it valuable in creating heat-resistant and chemically stable materials. Commonly employed in the development of optical brighteners, fluorescent dyes, and pharmaceuticals due to its ability to participate in coupling reactions. Also utilized in the synthesis of agrochemicals and fine chemicals where aromatic vinyl structures are needed. Its reactivity makes it suitable for use in cross-linking agents and in the preparation of functionalized polystyrene derivatives for research and industrial applications.