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Two PP bonds in the P10 ligand of an allphosphorus analogue of dihydrofulvalene must be opened so that each Rh atom in complex 1 attains 18 valence electrons (structure shown without l,3-C5H3tBu2 ligands). The polycyclic Rh4P10 framework is centrosymmetric.
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Scherer et al. (1992) studied this question.
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