Using bent metallocenes for stabilizing unusual coordination geometries at carbon

Abstract

Novel unusually structured organic compounds can be made available with the aid of organometallic chemistry. A variety of typical examples are presented in this account where the unique stereoelectronic features of the bent metallocene bis(cyclopentadienyl)zirconium are used to stabilize uncommon coordination geometries of the element carbon. This includes internal ion pair phenomena and the electronic stabilization of planar-tetracoordinate carbon, examples of distorted C_2v-methane derivatives and of unprecedented geometries of pentacoordinated carbon compounds. For many such systems their specific energetic stabilization was estimated from suitable experiments.