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The mixed sandwich compounds C5H5MC8H8 are known for the first row transition metals Ti,Cr,Mn,and Co but not for V,Fe,and Ni.These known complexes exhibit varying hapticities of the C8H8 rings ranging from eight for Ti to six for Cr and probably Mn and four for Co.Furthermore,an interesting feature of the chemistry of the mixed sandwich compounds is the apparent instability of the 18-electron complexes (η5-C5H5)V(η8-C8H8) and (η5-C5H5)Mn(η6-C8H8) relative to the corresponding 17-electron complexes (η5-C5H5)Ti(η8-C8H8) and (η5-C5H5)Cr(η6-C8H8).