The unusually high kinetic stability of the silyl cation 1 is due to the presence of a three-center, two-electron Si-H-Si bond. NMR data ((1) H, (2) H, (13) C, (29) Si) are consistent with the static, symmetrical structure shown, which was further corroborated by the results of density functional calculations.
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Thomas Müller (2001) studied this question.
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