Used as a versatile building block in organic synthesis, particularly in the development of polymers and functional materials. It serves as a key intermediate in the preparation of polyethylene glycol (PEG)-based compounds, which are widely utilized in drug delivery systems, bioconjugation, and surface modification. Its t-butyl ester group provides stability during reactions, while the bromo group allows for further functionalization, making it valuable in creating tailored molecules for pharmaceuticals, coatings, and nanotechnology applications.