Lithium tetrakis(pentafluorophenyl)borate [LiB(C6F5)4], a neutral salt, effectively catalyzed Friedel–Crafts benzylation reactions of aromatic compounds with benzyl chloride or mesylate and their substituted derivatives. The LiB(C6F5)4-catalyzed reactions proceeded more efficiently in the coexistence of magnesium oxide.
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Mukaiyama et al. (2000) studied this question.
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