Preparation and molecular structures of some complexes containing C5 chains

Abstract

Complexes containing a Co3 cluster linked to SiMe3, Au(PPh3), W(CO)3Cp and Fc groups by a C5 chain have been prepared by elimination of AuBr(PR3) (R=Ph, tol) in the reactions between Co3(μ3-CBr)(μ-dppm)(CO)7 and {(R3P)Au}C6-point triple bond; length half of m-dashCC6-point triple bond; length half of m-dashCX [X=SiMe3, W(CO)3Cp] or {(OC)7(μ-dppm)Co3}CC6-point triple bond; length half of m-dashC{Au(PPh3)} and FcC6-point triple bond; length half of m-dashCI (X=Fc). Subsequent auro-desilylation of the SiMe3 compound affords {(OC)7(μ-dppm)Co3}6-point triple bond; length half of m-dashCC6-point triple bond; length half of m-dashCC6-point triple bond; length half of m-dashC{Au[P(tol)3]}. Single-crystal X-ray structures of the W(CO)3Cp, Au{P(tol)3} and Fc complexes are reported. The C5 chain shows little departure from a formal 6-point triple bond; length half of m-dashC---C6-point triple bond; length half of m-dashC---C6-point triple bond; length half of m-dashC--- fragment.