Used as an intermediate in the synthesis of pharmaceuticals, particularly in the production of active pharmaceutical ingredients (APIs) that require functionalized thiophene rings. Its sulfinate group allows for selective sulfur-based transformations, making it valuable in building complex organic molecules. Commonly employed in cross-coupling reactions and as a precursor in the development of agrochemicals and specialty chemicals. Its sodium salt form enhances solubility in polar solvents, facilitating its use in aqueous or mixed solvent reaction systems.