Isolation of New Disilanylene‐bridged Bis(cyclopentadienyl)‐tetracarbonyldiiron Complexes and Molecular Structure of [η5,η5‐C5H4SiMe(SiMePh2)C5H4]Fe2(CO)2(μ‐CO)2

1,2-Diphenyl-1,2-dimethyldisilanylene-bridged bis-cyclopentadienyl complex [η5,η5-C5H4PhMeSiSiMePh-C5H4]Fe2(CO)2(μ-CO)2 (1) was synthesized by a modified procedure, from which the trans-isomer 1b that was previously difficult to obtain has been isolated for the first time. More interestingly, two new regio-isomers [η5,η5-C5H4SiMe(SiMePh2)C5H4]Fe2(CO)2(μ-CO)2 (2) and [η5,η5-C5H4Me2SiSiPh2C5H4]Fe2(CO)2(μ-CO)2 (3) were occasionally obtained during above process, the novel structures of which opened up new options for further study of this type of Si–Si bond-containing transition metal complexes. The molecular structure of 2 has been determined by the X-ray diffraction method.