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Reductive cleavage of a bridging diphosphide complex with sodium amalgam affords the sodium salt of the terminal niobium phosphide anion [PNb(N[Np]Ar)3]− (1; Np=neopentyl, Ar=3,5-Me2C6H3), which is best formulated as containing an NbP triple bond. The phosphorus atom of 1 is nucleophilic. Treatment of 1 with ClP(tBu)2 or ClP(Ph)2 provides η2-phosphanylphosphinidene complexes, which are the first examples of such complexed ligands bound to an early-transition-metal fragment.
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Figueroa et al. (2004) studied this question.
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