Syntheses and characterization of tricarbonyl tungsten complexes containing 1,1'-bis(diphenylphosphino)ferrocene ligand

Article abstract of DOI:10.1016/0022-328X(95)05413-J

Treatment of W(CO)3(NCCH3)3 with 1,1'-bis(diphenylphosphino)ferrocene (dppf) affords W(CO)3(NCCH3)(η²-dppf) (1) in 85percent) yield.Reaction of 1 with I2 produces a seven-coordinated complex W(CO)3(I)2(η²-dppf) (2), which is further oxidized by H2O2 to give W(CO)3(I)2(η²-dppf(=O)) (3) in 80percent yield.Compound 1 reacts with PMe3 forming fac-W(CO)3(η²-dppf)(PMe3) (4) in 90percent yield.However, reaction of 1 with PPh2Cl generates fac-W(CO)3(η²-dppf)(PPh2H) (5) and fac-W(CO)3(η²-dppf)(PPh2OH) (6) after separation of the reaction mixture by TLC.The structures of compounds 1 and 3 have been characterized by X-ray diffraction methods.Keywords: Tungsten