A trifle of triflyl: N-substituted anilines react with 1,1,3,3-tetrakis(triflyl)propane to give a 2,2-bis(triflyl)ethyl group at the para position of the ring. The product is a zwitterion with a carbanion and an ammonium moiety, and can be used as an acid catalyst for organic reactions (see scheme).
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Yanai et al. (2012) studied this question.
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