Sodium tetrahydropyransulfinate is primarily used in organic synthesis as a reducing agent. It is particularly effective in the reduction of various organic compounds, including the conversion of nitro groups to amines, which is a crucial step in the synthesis of pharmaceuticals and agrochemicals. Additionally, it is employed in the reduction of disulfides to thiols, a reaction that is important in the preparation of certain polymers and in the modification of proteins. Its ability to act as a mild and selective reducing agent makes it valuable in the synthesis of complex molecules where preserving the integrity of other functional groups is essential. Furthermore, it is utilized in the preparation of sulfinic acids, which are intermediates in the production of various organic compounds. Its application extends to the field of materials science, where it is used in the synthesis of certain types of polymers and in the modification of surfaces to impart specific chemical properties.