Sodium p-toluenesulfinate is widely used as a reducing agent in organic synthesis, particularly in reactions involving the generation of sulfonyl radicals. It plays a key role in the preparation of sulfones and sulfonamides, which are important intermediates in pharmaceuticals and agrochemicals. Additionally, it is employed in photoredox catalysis to facilitate various transformations under mild conditions. In polymer chemistry, it acts as a chain transfer agent to control molecular weight during polymerization processes. Its application extends to the field of materials science, where it is used in the synthesis of functionalized surfaces and nanoparticles.