Si-, Ge-, and Sn-Centered Cations

Lee, V. Ya Sekiguchi, A. Heavy Analogs of Carbenium Ions Si-, Ge-, Sn- and Pb-Centered Cations. In Organometallic Compounds of Low-Coordinate Si, Ge, Sn and Pb From Phantom Species to Stable Compounds. Chichester, UK John Wiley Sons, Ltd 2010. http //dx.doi.org/10.1002/9780470669266. Chapter 1. 

From Free Radicals RR R"E This last synthetic route, involving the one-electron oxidation of the free radicals RR R"E with an appropriate Lewis acid such as PhjC, is one of the best methods for the extremely fast and clean formation of the element-centered cations RR R"E+. Although this approach requires the presence of the radical species as readily available starting materials, the recent synthesis of stable silyl-substituted radicals of the type (r-Bu2MeSi)3E (E = Si, Ge, Sn) (see Section 2.2.4.1.2) made such an approach a rather attractive and easily accessible synthetic route to the stable and free (r-Bu2MeSi)3E+ cations (Scheme 2.6)... 

---