The first triphosphete 1a and its arsenic analog 1b are the products of the reactions of PCl3 and AsCl3, respectively, with Li[C(PPh2)2-(SiMe3)]. The side product Ph2(Cl)PC(PPh2)(SiMe3) 2 reacts further with 1a and NaBPh4 by chloride abstraction to yield the spirocyclic ten-electron cation 3 with a pseudo-trigonal-bipyramidal PP4 skeleton.
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Karsch et al. (1996) studied this question.
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