SCHEDULED MAINTENANCE
Heterogeneous phase-transfer catalysts, such as phosphonium salts and crown-ethers, immobilized on a polystyrene matrix, show an increase in activity approaching that of the corresponding non-immobilized catalysts, when they are bonded with a long spacer chain to the polymeric support.
H. Molinari, F. Montanari and P. Tundo, J. Chem. Soc., Chem. Commun., 1977, 639 DOI: 10.1039/C39770000639
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