Stereospecific access to the unprecedented P-B-P bridged [3]ferrocenophane Fe(CHPtBu)BMes is presented. In contrast to acyclic ferrocenylphosphanes, we find evidence for a shift of spin-density from Fe to P upon pyramidal inversion of the P centers in the mono-cation; the latter has a lifetime of τ = 0.31(4) s.
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