Used primarily as a reagent in organic synthesis, especially in the protection of amines and alcohols during multi-step reactions. Its reactivity allows it to form carbamate or carbonate derivatives, which are stable under various reaction conditions but can be selectively removed when needed. Commonly employed in pharmaceutical synthesis where selective functional group manipulation is critical. It is also utilized in peptide chemistry to prevent unwanted side reactions by blocking reactive sites. Due to its lability under mild basic or acidic conditions, it offers flexibility in deprotection strategies. Handling requires caution as it is moisture-sensitive and can release phosgene-like byproducts upon decomposition.