Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 24, Issue 11, Pages 681-685Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200350012
Keywords
amino-PEG; clays; Mitsunobu reaction; quaternization; steric stabilization
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The hydroxyl end groups of poly(ethylene glycol) (PEG) have been transformed easily and quantitatively into amino groups via the Mitsunobu reaction Phthalimide was alkylated with PEGs and the hydrazinolysis of the resulting phthalimido-PEGs gave the amino compounds in high yields. Quaternization of the amino groups leads to hydrophilic polymer chains bearing a positive charge on one or two ends, depending on the chosen PEG. Such products can be used to protect sterically, negatively charged particles such as clays.
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