What potential does the pentamethylcyclopentadienyl ligand Cp* have in diphosphene chemistry? An indication is provided by the synthesis of the crystalline diphosphene Cp*PPCp* from Cp*PCl2. The two Cp* ligands kinetically stabilize the PP bond, resulting in a fluxional structure (degenerate [1,5]‐sigmatropic rearrangements). They may be successively replaced by bulky amino or alkyl ligands.
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Jutzi et al. (1986) studied this question.
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