1. The normalKirsanov reaction of fluor-substituted anilines yields fluorinated N-phenyl-trichlorophosphineimines, which on ammonolysis give the corresponding bis(phosphoranylidene) ammonium chlorides [RNH−P(NH2)2]2N+Cl−.

Die Ammonolyse dieser Verbindungen führt zu Biphosphoniumchloriden der allgemeinen Form [RNH−P(NH2)2]2N+Cl−.