Solution and X-ray structure of triethylsilylmethyl-substituted tropylium cation.
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]
Hassall
Kathryn S
KS
School of Chemistry, The University of Melbourne, Parkville, 3010 Melbourne, Australia.
White
Jonathan M
JM