Used as a key intermediate in the synthesis of agrochemicals and pharmaceuticals, particularly in the production of neonicotinoid insecticides. It serves as a building block for constructing biologically active molecules due to its reactive aldehyde group and chlorine functionality. Its structure allows for easy modification in heterocyclic chemistry, enabling the development of compounds with enhanced pesticidal or medicinal properties. Commonly employed in condensation and coupling reactions to form more complex thiazole derivatives with targeted biological activity.