title: Phosphazene cations.
abstract: Cations derived from (NPCl2)3, hexachloro-cyclo-triphosphazene, the weakly basic precursor of phosphazene polymers, have been prepared using strongly electrophilic reagents based on carborane anions. N-protonated, N-methylated, and N-silylated adducts of (NPCl2)3 have been isolated and characterized by X-ray crystallographic and spectroscopic methods. The normally potent chloride-abstracting silyl reagents of the type R3Si(carborane) are unable to abstract chloride from (NPCl2)3, even though the coordinatively unsaturated N2P2Cl5+ cation is widely accepted as a reactive intermediate in the ring-opening polymerization of (NPCl2)3.
authors.affiliation: Center for S and P Block Chemistry, Department of Chemistry, University of California, Riverside, CA 92521, USA.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fook S
authors.initials: FS
authors.lastname: Tham
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Reed