The reactivity of the P butterfly complexes [{Cp'''Fe(CO)}(μ,η-P)] (A, Cp''' = CHBu) and [{Cp*Cr(CO)}(μ,η-P)] (B, Cp* = C(CH)) towards the N-heterocyclic carbene IMe (1,3,4,5-tetramethyl-imidazol-2-ylidene) is reported. The reaction of A affords [P(IMe)][Fe(CO)Cp'''] (1) or [P(IMe)][{Cp'''Fe}(μ,η-P)] (2), the latter possessing a P-allylic moiety. In contrast, the reaction of B yields [P(IMe)][Cr(CO)Cp*] (3) and [{Cp*Cr(CO)}(η-PIMe)][Cr(CO)Cp*] (4), featuring a novel metal-bridged P dumbbell.
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