Used as a reagent in organic synthesis, particularly in the preparation of cyanomethyl phosphorus ylides for Wittig-type reactions. It enables the introduction of cyanomethyl groups into carbonyl compounds, facilitating the formation of cyano-substituted alkenes, which are valuable intermediates in pharmaceuticals and agrochemicals. Its solid-state stability and good reactivity make it suitable for controlled reaction conditions in heterocyclic and complex molecule synthesis.