Used as a protecting group reagent in organic synthesis, particularly in peptide and heterocyclic chemistry. It selectively protects amine functionalities due to the electron-withdrawing nature of the sulfonyl group, enhancing the acidity of the N–H proton, which facilitates deprotonation and subsequent alkylation or functionalization. The tert-butoxycarbonyl (Boc) group allows for orthogonal protection strategies, enabling selective deprotection under mild acidic conditions without affecting other sensitive functional groups. Commonly employed in multi-step syntheses of pharmaceuticals and natural products where controlled amine reactivity is required.