Used primarily in organic synthesis, especially in the preparation of modified peptides and functionalized polymers. It serves as a key reagent for introducing the Fmoc-protected aminopropyl group into molecules, enabling controlled stepwise synthesis in solid-phase peptide chemistry. The bromide moiety acts as a reactive handle for nucleophilic substitution, allowing attachment to various substrates such as resins or scaffolds. Its Fmoc group provides orthogonal protection, facilitating selective deprotection under mild basic conditions without affecting other sensitive functional groups. Commonly employed in the development of peptide libraries, bioconjugates, and dendrimers where precise chain elongation and side-chain modification are required.