tert-Butyl (8-aminooctyl)carbamate is a bifunctional protecting group reagent in organic synthesis, featuring a free primary amine at one end of the octyl chain for selective conjugation and a tert-butyloxycarbonyl (Boc)-protected amine at the other. The Boc group shields the protected amine during multi-step reactions and can be removed under mild acidic conditions, allowing deprotection without impacting the free amine or other sensitive groups. It is commonly used in peptide and oligonucleotide synthesis, pharmaceutical manufacturing for drug intermediates, and the preparation of functionalized polymers or surface linkers, leveraging its stability under basic and nucleophilic conditions.