The heteroleptic sandwich complex [Mn(η5-C5H5)(η6-C6H6)] was selectively dilithiated with BuLi/pmdta to afford the highly reactive derivative [Mn(η5-C5H4Li)(η6-C6H5Li)]⋅pmdta, which was structurally characterized by X-ray diffraction (pmdta=pentamethyldiethylenetriamine). Reactions with element dihalides yielded the corresponding borametalloarenophane and silametalloarenophane in good yields (see scheme).
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