Used primarily as a reagent in organic synthesis, particularly in the protection of functional groups such as amines and alcohols. Its reactivity allows it to form carbamate or carbonate derivatives, which are stable under various reaction conditions but can be removed selectively when needed. Commonly employed in peptide synthesis and pharmaceutical intermediates where controlled protection-deprotection strategies are required. Also utilized in the preparation of agrochemicals and specialty polymers due to its ability to modify molecular structure with an aromatic methyl-substituted phenyl group. Handling requires caution due to its lachrymatory and moisture-sensitive properties.