Used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Acts as a sulfonating agent in certain reactions, enabling the introduction of sulfur-containing functional groups. Employed in the formulation of lubricant additives to improve oxidation stability and reduce acidity. Also utilized in some polymerization processes as a chain transfer agent or stabilizer. Its reactivity makes it suitable for use in specialty chemical manufacturing where controlled sulfur incorporation is required.