Used primarily as a derivatizing agent in organic synthesis, particularly in the protection of alcohols and amines during multi-step reactions. Its reactivity allows it to form carbonate esters or carbamates, which are stable under various reaction conditions but can be cleaved selectively when needed. Commonly employed in peptide synthesis and pharmaceutical intermediates where controlled functional group manipulation is required. Also finds use in analytical chemistry for modifying polar compounds to enhance volatility or detection in gas chromatography and mass spectrometry. Handling requires caution due to its lachrymatory and moisture-sensitive properties.