This chemical is primarily used in the field of organic synthesis and pharmaceutical research. It serves as a key intermediate in the development of complex molecules, particularly in the synthesis of polyethylene glycol (PEG) derivatives. Its structure, featuring a phenyl group and a methanesulfonate moiety, makes it valuable for creating PEGylated compounds, which are widely used to enhance the solubility, stability, and bioavailability of drugs. Additionally, it is utilized in the preparation of prodrugs, where the methanesulfonate group can be leveraged for targeted drug delivery systems. Its applications also extend to the modification of biomolecules, such as proteins and peptides, to improve their therapeutic properties.