Synthesis and reactions of co-ordinatively unsaturated µ3-alkylidyne clusters; X-ray crystal structures of the phosphido-bridged complexes [Fe2W(µ3-CR)(µ-H)(µ-PPh2)(CO)6(η-C5H5)], [Fe2W(µ3-CR)(µ-H)(µ-PEt2)(CO)6(PEt2H)(η-C5H5)], and [Fe2W(µ3-CR){µ-C(O)C(Me)CHMe}(µ-PEt2)(CO)5(η-C5H5)](R = C6H4Me-4)

Abstract

Thermal decarbonylation of the phosphido-bridged complexes [Fe₂W(µ₃-CR¹)(µ-H)(µ-PR²₂)(CO)₇(η-C₅H₅)] affords the co-ordinatively unsaturated derivatives [Fe₂W(µ₃-CR¹)(µ-H)(µ-PR²₂)(CO)₆(η-C₅H₅)] which react readily with CO, PR²₂H, or R³CCR³(R¹= C₆H₄Me-4, R²= Ph or Et, and R³= Me, Et, or Ph); the structures of the species [Fe₂W(µ₃-CR¹)(µ-H)(µ-PPh₂)(CO)₆(η-C₅H₅)], [Fe₂W(µ₃-CR¹)(µ-H)(µ-PEt₂)(CO)₆(PEt₂H)(η-C₅H₅)], and [Fe₂W(µ₃-CR¹){µ-C(O)C(Me)CHMe}(µ-PEt₂)(CO)₅(η-C₅H₅)] have been established by X-ray crystallography.