Used primarily as a reactive intermediate in organic synthesis, especially in the pharmaceutical and agrochemical industries. It participates in Michael addition reactions and cycloadditions, making it valuable for constructing complex molecules. Commonly employed in the production of steroids, vitamins, and other biologically active compounds. Also utilized in polymer chemistry as a crosslinking agent or monomer for specialty resins. Its high reactivity requires careful handling, but it enables efficient formation of carbon-carbon bonds in multi-step syntheses.