Used primarily as a derivatization agent in organic synthesis, particularly in peptide chemistry where it helps protect functional groups during reactions. It is also employed in the preparation of mixed carbonates and esters, which serve as intermediates in pharmaceutical manufacturing. Its reactivity makes it useful in introducing the pentyloxycarbonyl protecting group in sensitive syntheses. Additionally, it finds application in analytical chemistry for modifying polar compounds to enhance their volatility for gas chromatography. Due to its lachrymatory and corrosive nature, handling requires strict safety controls.