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Pentaphenylcyclopentadienes that are para-substituted at each phenyl group prove to be valuable new ligands. They are easily prepared in good yield and high purity from pentaphenylcyclopentadiene by acetylation and subsequent acetalation. Owing to the ease with which the electronic properties of these ligands can be modified and due to the solubility and the facile characterization of their complexes it is now possible to explore the whole field of decaatylmetallocenes. The first soluble decaaryhnetallocenes with tin and lead as the metal atom are described.

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