Typical phase-transfer catalysts, namely organophilic onium salts, crown ethers, and cryptands, when immobilized on a polymer matrix retain most of their catalytic activity, thus permitting catalyst recycling by simple filtration from the reaction medium.
M. Cinouini, S. Colonna, H. Molinari, F. Montanari and P. Tundo, J. Chem. Soc., Chem. Commun., 1976, 394 DOI: 10.1039/C39760000394
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