SYNTHESES AND CHARACTERIZATION OF TRICARBONYL TUNGSTEN COMPLEXES CONTAINING 1,1'-BIS(DIPHENYLPHOSPHINO)FERROCENE LIGAND

Treatment of W(CO)(3)(NCCH3)(3) with 1,1'-bis(diphenylphosphino)ferroc ene (dppf) affords W(CO)(3)(NCCH3)(eta(2)-dppf) (1) in 85%) yield. Rea ction of 1 with I-2 produces a seven-coordinated complex W(CO)(2)(I)(2 )(eta(2)-dppf) (2), which is further oxidized by H2O2 to give W(CO)(3) (I)(2)(eta(2)-dppf(=O)) (3) in 80% yield. Compound 1 reacts with PMe(3 ) forming fac-W(CO)(3)(eta(2)-dppf)(PMe(3)) (4) in 90% yield. However, reaction of 1 with PPh(2)Cl generates fac-W(CO)(3)(eta(2)-dppf)(PPh(2 )H) (5) and fac-W(CO)(3)(eta(2)-dppf)(PPh(2)OH) (6) after separation o f the reaction mixture by TLC. The structures of compounds 1 and 3 hav e been characterized by X-ray diffraction methods.