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Five benzoferrocenyl phosphine ligands with the phosphorus atom attached to the 5-position of the benzofer- rocene and some ligand-Mo(CO)5 complexes were prepared and fully characterized; the structure of one ligand was con- firmed by X-ray crystallography. These ligands were applied in palladium-catalyzed allylic alkylation and Suzuki cou- pling of chlorobenzene with phenylboronic acid. Results were compared with those reported previously using ligands hav- ing the phosphorus atom attached to the 4-position of benzoferrocene. This structural modification resulted in an increase of activity of the ligands in allylic alkylation reaction but a decrease of activity in Suzuki coupling reactions. The underly- ing reasons are analyzed with the help of X-ray single crystal determined structures and CO stretching frequencies in the IR spectra of complexes between the ligands and Mo(CO)5.

Steric and Electronic Effects of Benzoferrocenyl Phosphine Ligands on Palladium-Catalyzed Allylic Alkylation and Suzuki Coupling Reactions