Introducing strong acids: The reaction of electron-rich arenes with Tf2CHCH2CHTf2 (Tf=trifluoromethanesulfonyl; triflyl) smoothly gave 2,2-bis(triflyl)ethylated arenes. This reaction provides a convenient methodology for the introduction of a Tf2CH group, which is known to be a strongly Brønsted acidic functionality, to organic compounds in a regioselective manner (see scheme). On the basis of this reaction, significantly active and thermally stable carbon acid catalysts were developed.
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Yanai et al. (2011) studied this question.
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