Synthesis
Cp2Fe2(CO)4 was first isolated as an intermediate in the synthesis of ferrocene from iron pentacarbonyl and dicyclopentadiene and has since been found as a byproduct of many organoiron reactions. Cp2Fe2(CO)4 is synthesized by the reaction of Fe(CO)5 and dicyclopentadiene.
- 2 Fe(CO)5 + C10H12 → (C5H5)2Fe2(CO)4 + 6 CO + H2
In this preparation, dicyclopentadiene cracks to give cyclopentadiene, which reacts with Fe(CO)5 concomitant with loss of CO. Thereafter, the pathways for the photochemical and thermal routes differ subtly but both entail formation of a hydride intermediate.
Read more about this topic: Cyclopentadienyliron Dicarbonyl Dimer
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