5- (Azido-PEG4) -pent-2-yn-1-ol

5- (Azido-PEG4) -pent-2-yn-1-ol is a compound featuring an azido group and a terminal hydroxyl group within a PEG linker. The hydrophilic PEG spacer enhances solubility in aqueous media. The azido group can undergo Click Chemistry with alkynes, BCN, and DBCO, producing stable triazole bonds. The hydroxyl group can be further derivatized or replaced by other reactive functional groups.