Facile carbon–carbon and carbon–phosphorus bond-forming and -breaking processes in metal chain clusters: X-ray crystal structures of [W3Rh2(µ-CO)2(µ-CMe){µ-C(Me)C(O)}(µ-PPh2)2(µ3-CMe)(CO)2(η-C5H5)3] and [W3Rh2(µ-CO)3(µ-CMe){µ-C(Me)PPh2}(µ-PPh2)(µ3-CMe)(CO)2(η-C5H5)3

Abstract

Using the reagents [W(CMe)(CO)2(η-C5H5)] and [Rh2(µ-PPh2)2(cod)2](cod = cyclo-octa-1,5-diene), tetra- and penta-nuclear tungsten-rhodium chain clusters have been prepared and the structures of [W3Rh2(µ-CO)2(µ-CMe){µ-C(Me)C(O)}(µ-PPh2)2(µ3-CMe)(CO)2(η-C5H5)3] and [W3Rh2(µ-CO)3(µ-CMe){µ-C(Me)PPh2}(µ3-CMe)(CO)2(η-C5H5)3] have been determined by X-ray diffraction; the latter contains a λ5-phospha-alkyne ligand bridging a W–Rh bond.