Used as an intermediate in organic synthesis, particularly in the preparation of disulfide-containing compounds for pharmaceuticals and biologically active molecules. Its tosylate group allows for selective nucleophilic substitution, enabling the introduction of the 2-hydroxyethyl disulfide moiety into target structures. Commonly applied in the development of prodrugs, peptide mimetics, and redox-sensitive linkers in drug delivery systems. Also utilized in the synthesis of functional polymers and crosslinking agents where reversible disulfide bonds are desired.