Keywords: Metallocenes / P ligands / Silicon / Phosphaferrocenes / Conformation analysis New sterically crowded phosphaferrocene and -ruthenocene derivatives were synthesized via the 2,5-bis(trimethylsilyl)-phospholide anion 5. Their reactivity with regard to the exchange of the Me 3 Si groups for other functional groups was examined. X-ray structures were determined for the mono-(6) and the 1,1Ј-diphosphaferrocene (8). The activation barrier for ring-ring rotation in 8 was determined by NMR spec-
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