• CAS No.：
  581065-94-3
• Synonyms：
  Tos-PEG4-TBA
  
• Purity：
  ≥95%
• MF：
  C₂₂H₃₆O₉S
• MW：
  476.21
• Recommended Storage Condition：
  Store at -5°C,keep in dry and avoid sunlight.
• Uses：
  Applicated in medical research, drug-release, nanotechnology and new materials research, cell culture. In the study of ligand, polypeptide synthesis support, a graft polymer compounds, new materials, and polyethylene glycol-modified functional coatings and other aspects of the active compound.

Tos-PEG4-CH2CH2COOtBu (Tos-PEG4-t-butyl ester) is a functional PEG linker featuring a tosyl group and a t-butyl-protected ester. The PEG4 spacer improves solubility in aqueous media, enhancing compatibility in biological and chemical applications. The tosyl group serves as an excellent leaving group, facilitating nucleophilic substitution reactions, while the t-butyl ester can be easily deprotected under mild acidic conditions to yield a free carboxyl group. This reagent is ideal for targeted bioconjugation and organic synthesis, providing versatility for further modifications.

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