• USA Home
  • 902586 - Hydroxy-PEG4-t-butyl ester

902586 Sigma-Aldrich

Hydroxy-PEG4-t-butyl ester

Synonym: tert-Butyl-1-hydroxy-3,6,9,12-tetraoxapentadecan-15-oate, HO-PEG4-CO-OtBu

  • CAS Number 518044-32-1

  • Empirical Formula (Hill Notation) C15H30O7

  • Molecular Weight 322.39



Related Categories Bifunctional Linkers, Chemical Biology, Chemical Synthesis, Linkers and Crosslinkers
assay   ≥95%
form   liquid
reaction suitability   reagent type: cross-linking reagent
refractive index   n/D 1.4492
density   1.04746 g/mL
storage temp.   2-8°C



This heterobifunctional, PEGylated crosslinker features a hydroxyl group at one end and t-butyl-protected carboxylic acid at the other, which can be deprotected with acidic conditions. The hydrophillic PEG linker facilitates solubility in biological applications. Hydroxy-PEG4-t-butyl ester can be used for bioconjugation or as a building block for synthesis of small molecules, conjugates of small molecules and/or biomolecules, or other tool compounds for chemical biology and medicinal chemistry that require ligation. Examples of applications include its synthetic incorporation into antibody-drug conjugates or proteolysis-targeting chimeras (PROTAC® molecules) for targeted protein degradation.

Other Notes

Recruiting cytotoxic T cells to folate-receptor-positive cancer cells

Syntheses and characterizations of novel pyrrolocoumarin probes for SNAP-tag labeling technology

High density orthogonal surface immobilization via photoactivated copper-free click chemistry

Legal Information

PROTAC is a registered trademark of Arvinas Operations, Inc., and is used under license

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

Please Enter a Lot Number
Protocols & Articles
Peer-Reviewed Papers


Related Products

related product

Product #


Add to Cart

901831 Pomalidomide-PEG5-NH2 hydrochloride
901830 Pomalidomide-PEG4-NH2 hydrochloride, ≥95%
901824 Pomalidomide-PEG4-CO2H
901860 (S,R,S)-AHPC-PEG6-NH2 hydrochloride, ≥95%
902691 Hydroxy-PEG5-t-butyl ester
902578 Hydroxy-PEG6-t-butyl ester, ≥95%
903434 Pomalidomide-PEG6-butyl azide, ≥95%
903442 Pomalidomide-PEG6-butyl iodide, ≥95%
903833 Pomalidomide-PEG2-azide
903825 Pomalidomide-PEG1-azide
903957 (S,R,S)-AHPC-PEG1-azide
904651 (S,R,S)-AHPC-PEG3-azide, ≥95%
904724 Pomalidomide-PEG2-butyl iodide, ≥95%
904708 Pomalidomide-C6-PEG3-butyl iodide, ≥95%
904678 Pomalidomide-PEG3-azide
904686 Pomalidomide-C6-PEG3-butyl azide, ≥95%
904813 (S,R,S)-AHPC-PEG2-azide
904821 (S,R,S)-AHPC-C6-PEG3-butyl azide, ≥95%
904880 Pomalidomide-C6-PEG1-C3-PEG1-butyl azide, ≥95%
904872 Pomalidomide-PEG2-butyl azide, ≥95%
904864 (S,R,S)-AHPC-PEG6-butyl azide, ≥95%
905178 (S,R,S)-AHPC-C6-PEG1-C3-PEG1-butyl azide, ≥95%
905275 (S,R,S)-AHPC-PEG6-butyl amine hydrochloride, ≥95%
905216 (S,R,S)-AHPC-PEG2-butyl azide, ≥95%
905232 (S,R,S)-AHPC-C6-PEG3-butyl amine hydrochloride, ≥95%
905224 Pomalidomide-PEG6-butyl amine hydrochloride, ≥95%
905208 Pomalidomide-C6-PEG3-butyl amine hydrochloride, ≥98%
905399 (S,R,S)-AHPC-PEG2-butyl chloride
905380 (S,R,S)-AHPC-C6-PEG3-butyl chloride, ≥95%
905402 (S,R,S)-AHPC-C6-PEG1-C3-PEG1-butyl chloride, 95%
906050 Pomalidomide-C6-PEG1-C3-PEG1-butyl iodide, ≥95%
906123 (S,R,S)-AHPC-PEG2-butyl amine hydrochloride
907677 (S,R,S)-AHPC-PEG6-butyl chloride

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?