Used primarily as a synthetic intermediate in organic chemistry, particularly in the preparation of pharmaceuticals and agrochemicals. Its reactivity allows for the introduction of chlorine and carboxylic acid functional groups into larger molecules. It serves in the synthesis of biologically active compounds, including enzyme inhibitors and antimicrobial agents. Due to the presence of conjugated double bond and electron-withdrawing groups, it participates in cycloaddition and nucleophilic addition reactions, making it valuable in constructing complex molecular frameworks. Also investigated for use in the development of specialty polymers where controlled polarity and reactivity are required.