| Abstract
| - Treatment of (η5-C5H4Me)4Fe4(μ3-CO)4 with LiAlH4, followed by air-oxidation in thepresence of NH4PF6, led to stepwise reduction of the four carbonyl ligands to afford [(η5-C5H4Me)4Fe4(μ3-CO)3(μ3-CH)](PF6), [(η5-C5H4Me)4Fe4(μ3-CO)2(μ3-CH)2](PF6)2, [(η5-C5H4Me)4Fe4(μ3-CO)(μ3-CH)(HCCH)](PF6), and [(η5-C5H4Me)4Fe4(HCCH)2](PF6). Two-electron reductionof [(η5-C5H4Me)4Fe4(μ3-CO)2(μ3-CH)2](PF6)2 resulted in coupling of two methylidyne ligandsto form the acetylene-coordinated cluster (η5-C5H4Me)4Fe4(μ3-CO)2(HCCH), two-electronoxidation of which regenerated [(η5-C5H4Me)4Fe4(μ3-CO)2(μ3-CH)2](PF6)2. Further treatmentof isolated (η5-C5H4Me)4Fe4(μ3-CO)2(HCCH) with LiAlH4 produced (η5-C5H4Me)4Fe4(HCCH)2.All clusters were fully characterized by X-ray diffraction studies.
- Treatment of Cp‘4Fe4(μ3-CO)4 (Cp‘ = η5-C5H4Me) with LiAlH4, followed by air oxidation in the presence of NH4PF6, led to stepwise reduction of the four carbonyl ligands to afford [Cp‘4Fe4(μ3-CO)3(μ3-CH)](PF6), [Cp‘4Fe4(μ3-CO)2(μ3-CH)2](PF6)2, [Cp‘4Fe4(μ3-CO)(μ3-CH)(HCCH)](PF6), and [Cp‘4Fe4(HCCH)2](PF6). Two-electron reduction of [Cp‘4Fe4(μ3-CO)2(μ3-CH)2](PF6)2 resulted in coupling of two methylidyne ligands to form Cp‘4Fe4(μ3-CO)2(HCCH). All clusters were fully characterized by X-ray diffraction studies.
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