Isolation and Structure of [HC{CH(SiMe<sub>3</sub>)(SnMe<sub>3</sub>)}<sub>2</sub>]<sup>+</sup>: A Remarkably Stable <i>sec</i>-Alkyl Cation
作者:Mark Schormann、Shaun Garratt、David L. Hughes、Jennifer C. Green、Manfred Bochmann
DOI:10.1021/ja026443f
日期:2002.9.1
sec-alkyl carbocation salts, [HCCH(R)SnMe3}2]+M2Cl9- (M = Zr, Hf). The compounds are thermally stable and, unlike previously isolated trialkyl carbocations, do not require superacidic media or weakly coordinating anions for stability. The crystalstructure and DFT calculations suggest polarization of the Sn substituents and hyperconjugation as the reason for the unexpected stability. The stabilizing effect