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Treatment of the N-heterocyclic chlorophosphine precursor (PPP)Cl (1) with two equivalents of nickelocene (NiCp2) affords the phosphorus-bridged dimer [(μ-PPP)Ni2Cp2]Cl (2). In contrast, an equimolar mixture of 1 and NiCp2 in the presence of PPh3 generates a different product, (PP(C5H5)P)NiCl2 (3), in which a cyclopentadienyl anion has migrated to the N-heterocyclic phosphenium center. The phosphorus-bound...
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