Used primarily as a reagent in organic synthesis, especially in peptide and pharmaceutical manufacturing. It acts as a protecting group agent for amines, helping to control reactivity during multi-step reactions. Commonly employed in the formation of carbamates and urethanes due to its ability to introduce the sec-butoxycarbonyl group. Valued in research laboratories for its effectiveness in coupling reactions and synthesis of complex molecules. Also utilized in the preparation of active esters and in chiral synthesis where selective protection is required. Requires careful handling due to its reactivity with moisture and nucleophiles.