1,1'-Bis(diphenylphosphino)ferrocene


1,1'-Bisferrocene, commonly abbreviated dppf, is an organophosphorus compound commonly used as a ligand in homogeneous catalysis. It contains a ferrocene moiety in its backbone, and is related to other bridged diphosphines such as 1,2-bisethane.

Preparation

This compound is commercially available. It may be prepared by treating dilithioferrocene with chlorodiphenylphosphine:
The dilithiation of ferrocene is easily achieved with n-butyllithium in the presence of TMEDA. Many related ligands can be made in this way. The Fe center is typically not involved in the behavior of the ligand.

Reactions

Dppf readily forms metal complexes. The palladium derivative, PdCl, which is popular for palladium-catalyzed coupling reactions, is prepared by treating dppf with the acetonitrile or benzonitrile adducts of palladium dichloride: