PEG7-O-Ms is widely used as a versatile intermediate in organic synthesis, particularly in the preparation of complex molecules and polymers. Its primary application lies in its role as a protecting group or activating agent in the modification of various compounds, especially in the pharmaceutical and materials science fields. The compound is often employed in the synthesis of polyethylene glycol (PEG) derivatives, which are crucial for drug delivery systems due to their ability to enhance solubility, stability, and bioavailability of therapeutic agents. Additionally, PEG7-O-Ms is utilized in the development of functionalized surfaces and coatings, where its reactive methanesulfonate group enables efficient conjugation with other molecules. This makes it valuable in creating biocompatible materials, hydrogels, and other advanced materials for medical and industrial applications. Its role in facilitating controlled chemical reactions and modifications underscores its importance in modern synthetic chemistry.