A Triphosphete and a Spirocyclic Cation with a PP_4 Skeleton and a 10e Spiro P Atom

摘要

A particularly wide variety of suitable redox processes are available for the formation of P-P bonds. For example, from the reaction of white phosphorus with phosphanes and phos-phanides Schmidpeier et al. obtained cyclic and acyclic triphos-pheniumions containing phosphorus(i) centers with eight electrons. Dtphosphinomeihanides are particularly suitable for the synthesis of heterocycles containing a P, unit: they can react with PCI, to yield heterocycles with eight-, seven-, or six-membered rings.However, in the reaction of PCI, with Li[C(PMe_2)_2(SiMe_3)] it was not possible to completely rule oul the formation of an as yet unknown four-membered ring system (triphosphete) rather than an eight-membered ring.