Copper has been immobilized on a chitosan-based responsive polymer microgel by simply stirring the microgel dispersion with copper sulfate. The ensuing catalyst is highly active for a model azide-alkyne [3+2]-cycloaddition reaction, and can be recycled at least 5 times; the catalytic activity can be tuned via swelling–deswelling transitions of the polymer gels.
Q. Wu, H. Cheng, A. Chang, X. Bai, F. Lu and W. Wu, Chem. Commun., 2014, 50, 14217 DOI: 10.1039/C4CC06436D
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