Used as a key intermediate in the synthesis of sulfonated dyes and pigments, particularly in azo dye production where it acts as a coupling component. It is also employed in the preparation of water-soluble anionic dyes for textiles, paper, and leather due to its ability to improve dye solubility and color fastness. Additionally, it serves as a reducing agent in certain polymerization reactions and in the development of sulfonated organic compounds for use in surfactants and dispersants. Its reactivity makes it valuable in industrial organic synthesis where sulfinate functionality is required.