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Reaction of GeCl2 · dioxane with mono-, bis- and tris-(trimethylsilyl)cyclopentadienyllithium yields bis-, tetrakis- and hexakis-(trimethylsilyl)germanocene. A single-crystal X-ray diffraction study shows the metallocene species with six silyl groups to consist of nearly parallel C5-units, bound symmetrically to the germanium center. The eclipsed conformation of the rings and the 1,2.4-silyl substitution pattern leave only two silyl groups face to face, effecting a small bending of the molecule. The molecular structure has been examined with the steric energy program EENY2. The conformation found in the crystal is close to the lowest minimum given by the calculations. |
