SYNTHESIS OF THE NOVEL MU-(PHOSPHANOALKYLIDENE) COMPLEXES [FE2CP2(CO)2(MU-CO)(MU-C(CN)PR2)] (PR2=PET2, PHCY, PHPH) AND MOLECULAR-STRUCTURE OF THE PET2 DERIVATIVE

Replacement of SMe2 at the pseudo-alkylidyne mu-carbon atom of [Fe2CP2(CO)2(mu-CO){mu-C(CN)SMe2}]SO3CF3 by PR2H (PR2 = PEt2, PCyH, PPhH) results in the formation of the phosphonium salts [Fe2Cp2(CO)2(mu-CO){mu-C(CN)PHR2}]SO3CF3 which upon deprotonation with NEt3 yield the corresponding neutral complexes [Fe2Cp2(CO)2(mu-CO)(mu-C(CN)PR2)]. These mu-(phosphanoalkylidene) complexes have been characterized on the basis of IR, (P{H})-P-31-H-1-, H-1-, and (C{H})-C-13-H-1-NMR spectra and by the X-ray molecular structure of [Fe2Cp2(CO)2(mu-CO){mu-C(CN)PEt2}].