Organophosphorus Complexes
Organophosphorus Complexes
Metal complexes having organophosphorus compounds as ligands are called organophosphorus complexes. Phosphines form various complexes with rhodium, palladium, nickel, cobalt, etc., such as chlorotris(triphenylphosphine)- rhodium [(Rh(PPh3)Cl)], tetrakis(triphenylphosphine)palladium, bis(triphenyl-phosphine)nickel chloride, [NiCl2[P(C6H5)3]2], etc. These metal complexes are used as catalysts in a number of organic transformations, including hydrogenation of alkenes. The organophosphorus nickel complex is used most commonly in oligomerization of monoolefins or conjugated dienes. In Suzuki reactions, bis(triphenylphosphine)nickel chloride can be used as an alternative to the palladium catalyst. Organophosphorus cobalt complexes are used as a mediator in the formation of carbon-carbon bonds in a variation of the Reformatsky reaction.
