Alkylidyne[pyrazol-1-yl)borato]tungsten complexes:metal–carbon triple bonds as four-electron donors

Abstract

The tungsten Complexes [W(CR)(CO)₂(R′Bpz₃)](R = Me or C₆H₄Me-4,R′H; R = C₆H₄Me-4,R = pz = pyrazol-1-yl) have been prepared and used to synthesise heteronuclear di-and tri-metal compounds with bridging alkylidyne ligands;the structures of the species [WCC₆H₄Me-4)(CO)₂(Bpz₄)] and [FeW(µ-CC₆H₄Me-4)(CO)₅(HBpz₃)] have been established by X-ray diffraction.