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The beta-silyl tropylium cation 9 has been successfully generated in the presence of the noncoordinating counterion tetrakis(pentafluorophenyl)borate in benzene and toluene. The (13)C and (29)Si NMR spectra of 9 demonstrate that the beta-silicon substituent interacts strongly with the aromatic pi-system of the cation by hyperconjugation. The crystal structure of 9 shows structural effects consistent with this interaction. [structure--see text]
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Hassall et al. (2004) studied this question.
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