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Cinchonidine, epicinchonidine, cinchonine or quinine have been N‐anchored to cross‐linked polystyrene (Merrifield resin) or grafted polystyrene (SynPhaseTM Lanterns) affording polymer‐supported chiral ammonium salts which are employed as phase‐transfer catalysts in the asymmetric alkylation of N‐(diphenylmethylene)glycine esters. These new polymeric catalysts can be easily recovered after the reaction by simple filtration and reused.
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Chinchílla et al. (2004) studied this question.
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