Used primarily as a reagent in organic synthesis, particularly in the preparation of heterocyclic compounds and amino acid derivatives. It serves as a cyano group donor and participates in cycloaddition reactions, enabling the construction of nitrogen-containing rings. Commonly employed in the synthesis of pharmaceuticals and agrochemicals due to its ability to introduce functional groups that are key to bioactive molecule development. Also utilized in peptide chemistry for protection and activation strategies. Requires careful handling due to high reactivity and toxicity.