Palladium catalyzed Suzuki coupling reactions using cobalt-containing bulky phosphine ligands

Three bulky mono-dentate alkyne-bridged dicobalt-phosphine complexes [(μ-PPh2CH2PPh2)Co2(CO)4](μ,η-PhCCPPh2) , [(μ-PPh2CH2PPh2)Co2(CO)4](μ,η-Me3CCCPPh2) and [(μ-PPh2CH2PPh2)Co2(CO)4](μ,η-Me3SiCCPPh2) were prepared from the reactions of the bis(diphenylphosphino)methylene (dppm) bridged dicobalt complex Co2(CO)6(μ-Ph2PCH2PPh2) with PhCCPPh2 , Me3CCCPPh2 , and Me3SiCCPPh2 , respectively. These three metal-containing compounds , and were employed as ligands, replacing conventional organic phosphines, in the Suzuki cross-coupling reactions and have been proved to be effective, authentic mono-dentate phosphine ligands.