Azido-PEG3-C-Boc is widely used in bioconjugation and click chemistry applications. Its azide group allows for efficient reactions with alkynes via copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling the labeling or attachment of molecules in biological systems. The PEG spacer enhances solubility and reduces steric hindrance, making it suitable for modifying peptides, proteins, or other biomolecules. The Boc (tert-butoxycarbonyl) protecting group ensures selective deprotection during synthesis, facilitating controlled functionalization. This compound is particularly valuable in drug delivery, material science, and the development of bioprobes or diagnostic tools. Its versatility makes it a key reagent in designing complex molecular architectures for research and therapeutic purposes.