title: Formation of the spirocyclic, Si-centered cage cations [ClP(NSiMe3)2Si(NSiMe3)2P5](+) and [P5(NSiMe3)2Si(NSiMe3)2P5](2).
abstract: On account of our interest in P4 activation by phosphenium ion insertion into P-P bonds we have developed synthetic routes to bicyclic N-P-Si-heterocycle 7 and probed its reactivity towards GaCl3 and P4. A GaCl3-induced rearrangement of 7 leads to the in situ formation of spirocyclic, Si-centered phosphenium ions. Their insertion into P-P bonds of one or two P4 tetrahedra yields polyphosphorus cages [ClP(NSiMe3)2Si(NSiMe3)2P5](+) (19(+)) and [P5(NSiMe3)2Si(NSiMe3)2P5](2+) (13(2+)).
authors.affiliation: TU Dresden, Fachrichtung Chemie und Lebensmittelchemie, Professur für Anorganische Molekülchemie, 01062 Dresden, Germany. jan.weigand@tu-dresden.de.
authors.forename: M H
authors.initials: MH
authors.lastname: Holthausen
authors.forename: J J
authors.initials: JJ
authors.lastname: Weigand
mesh_terms: D002412:Cations; D005708:Gallium / Q000737:chemistry; D006571:Heterocyclic Compounds / Q000737:chemistry*; D017553:Phosphorus Compounds / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*
chemical_list: D002412:Cations; D006571:Heterocyclic Compounds; D017553:Phosphorus Compounds; D005708:Gallium; D012825:Silicon