Some like it hot: A novel silicon-based Lewis acid having a trivalent silicon cation stabilized by an electron-rich transition metal as the “hot” Lewis acidic site catalyzes challenging Diels–Alder reactions at low temperatures with excellent reaction rates and selectivities (see scheme). In addition to the chemical stability of the silylium ion catalyst (in CH2Cl2), the potential of these reactive compounds is also discussed.
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Klare et al. (2009) studied this question.
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