Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of sulfonamide-based drugs and herbicides. Its reactive carbonyl chloride group allows for easy attachment to amines, forming amide bonds crucial in constructing biologically active molecules. Commonly employed in agrochemical research for creating pyrimidine derivatives with pesticidal properties. Also utilized in the preparation of dyes and functional materials due to its electron-deficient aromatic core, which supports charge transfer in optoelectronic applications.