DECASUBSTITUTED DECAPHENYLMETALLOCENES

Pentaphenylcyclopentadienes that are para-substituted at each phenyl g roup prove to be valuable new ligands. They are easily prepared in goo d yield and high purity from pentaphenylcyclopentadiene by acetylation and subsequent acetalation. Owing to the ease with which the electron ic properties of these ligands can be modified and due to the solubili ty and the facile characterization of their complexes it is now possib le to explore the whole field of decaarylmetallocenes. The first solub le decaarylmetallocenes with tin and lead as the metal atom are descri bed.