Stable Phosphazenium Ions in Synthesis—an Easily Accessible, Extremely Reactive “Naked” Fluoride Salt

Abstract

The strongest metal‐free base is the cation 1, which can be prepared in a one‐pot procedure from PCl5, NH4Cl, Me2NH, and NaBF4. Anion exchange affords 1‐F, which mediates in the alkylation of an anionic allylic species produced from allyltrimethylsilane; furthermore, the unsolvated floride ion is an excellent proton‐selective base for E2 eliminations. (Figure Presented.) Copyright © 1991 by VCH Verlagsgesellschaft mbH, Germany