Used as a key intermediate in organic synthesis, particularly in the preparation of functionalized polymers and dendrimers. Its oligoethylene glycol backbone provides flexibility and solubility in polar media, making it suitable for conjugation reactions in pharmaceutical and biotechnological applications. The tosylate end group acts as a good leaving group, enabling efficient nucleophilic substitution to attach biomolecules, fluorescent probes, or polymer chains. It is also employed in surface modification of nanoparticles and in the development of PEGylated compounds for drug delivery systems.