Used in organic synthesis as a reagent for the preparation of selenium-containing compounds, particularly in the development of pharmaceuticals and biologically active molecules. It serves as a key intermediate in the synthesis of selenocystine derivatives, which are important in peptide chemistry and protein studies. Additionally, it is utilized in materials science for creating selenium-based polymers and coatings with unique properties like antioxidant activity and thermal stability. Its role in catalysis is also notable, especially in reactions involving selenium as a mediator or catalyst.