Ionic liquids obtain firm support: Polymer-supported imidazolium salts are shown to be highly efficient catalysts for fluorination and other nucleophilic substitution reactions. The polystyrene-based ionic materials catalyze fluorination reactions (such as that shown in the scheme; X=BF4, OTf) in very high yield, and can be reused for many such reactions.
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Dong Wook Kim (2004) studied this question.
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