Azide-PEG6-Tos is widely used in bioconjugation and click chemistry applications due to its reactive azide and tosyl groups. The azide moiety enables efficient participation in copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, making it valuable for labeling biomolecules such as proteins, peptides, and nucleic acids. The tosyl group serves as a versatile leaving group, facilitating the introduction of the PEG linker into various molecular structures. This compound is particularly useful in drug delivery systems, where the PEG spacer enhances solubility and stability of conjugated drugs. Additionally, it is employed in the development of biosensors and diagnostic tools, where precise and stable molecular linkages are essential. Its applications also extend to materials science, where it is used to modify surfaces and create functionalized polymers.