Comparison of CpFe(COMe)(PPh₃)(CO) and CpFe(SnPh₃)(CO)(CCMe₂)

Vinylidenes such as Fe(SnPh₃)(CO)(=C=CMe₂)(h-C₅H₅) structurally are closely related to the Davies acyl Fe(COMe)(CO)(PPh₃)(h-C₅H₅). Note how approach of reagents from one side of the acyl is prevented by the phosphine in the Davies compound. A similar effect is seen in our vinylidene complexes.

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