Used as a key intermediate in the synthesis of functionalized polymers and surface modifiers, particularly in developing hydrophilic spacers for bioconjugation. Its oligoethylene glycol-like structure with a terminal hydroxyl and a chloroalkyl group enables selective coupling to biomolecules, dyes, or nanoparticles, enhancing solubility and reducing non-specific binding in diagnostic assays. Commonly employed in the preparation of PEG-like linkers for immunoassays, biosensors, and targeted drug delivery systems where controlled spacing and biocompatibility are critical. Also utilized in surface functionalization of glass or silicon substrates for microarray technologies due to its ability to form stable ether linkages while presenting a reactive chloroalkyl handle for further derivatization.