Azido-PEG5-acid

• CAT Number: I016966
• CAS Number: 1425973-16-5
• Molecular Formula: C13H25N3O7
• Molecular Weight: 335.35
• Purity: ≥95%
• Synonyms: 3-[2-[2-[2-[2-(2-azidoethoxy)ethoxy]ethoxy]ethoxy]ethoxy]propanoic acid
• InChI: InChI=1S/C13H25N3O7/c14-16-15-2-4-20-6-8-22-10-12-23-11-9-21-7-5-19-3-1-13(17)18/h1-12H2,(H,17,18)
• InChIKey: DPJUPQILWDVIKK-UHFFFAOYSA-N
• SMILES: C(COCCOCCOCCOCCOCCN=[N+]=[N-])C(=O)O

Azido-PEG5-acid(CAT: I016966) is a bifunctional polyethylene glycol (PEG) derivative featuring an azide group at one end and a terminal carboxylic acid at the other. The azide moiety enables highly selective “click chemistry” reactions with terminal alkynes, facilitating the creation of stable triazole linkages under copper-catalyzed or strain-promoted conditions. The carboxyl group allows straightforward conjugation to amines or other reactive groups via amide bond formation. The PEG5 spacer improves solubility, adds flexibility, and minimizes steric hindrance, making this reagent particularly useful in bioconjugation, drug delivery, surface modification, and materials science applications where dual functional handles are required.