Azide-PEG4-Tos

• CAT Number: M033432
• CAS Number: 168640-82-2
• Molecular Formula: C15H23N3O6S
• Molecular Weight: 373.42
• Purity: ≥95%
• Synonyms: 2-[2-[2-(2-azidoethoxy)ethoxy]ethoxy]ethyl 4-methylbenzenesulfonate
• InChI: InChI=1S/C15H23N3O6S/c1-14-2-4-15(5-3-14)25(19,20)24-13-12-23-11-10-22-9-8-21-7-6-17-18-16/h2-5H,6-13H2,1H3
• InChIKey: ZYZZLMAEZYMGEU-UHFFFAOYSA-N
• SMILES: CC1=CC=C(C=C1)S(=O)(=O)OCCOCCOCCOCCN=[N+]=[N-]

Azide-PEG4-Tos（Cat No.:M033432）is a heterobifunctional PEG linker that features an azide group on one end and a tosyl (tosylate) leaving group on the other. The azide functionality is versatile, enabling copper-catalyzed or strain-promoted click reactions with alkynes for efficient bioconjugation. The tosyl group provides a reactive site for substitution with nucleophiles such as amines, thiols, or alcohols, allowing further functionalization. The PEG4 spacer improves solubility, minimizes steric hindrance, and enhances flexibility, making this reagent highly useful for chemical biology, drug development, and advanced material synthesis workflows.