Phosphorus–flurine chemistry. Part XXIV. Preparation and nuclear magnetic resonance investigation of the fluorophosphate anions, [RPF5]– and [R1R2PF4]–, and of the dialkyl(or diaryl)dialkylaminodifluorophosphoranes, R1R2PF2NR32

Abstract

Caesium fluoride reacts with tetrafluorophosphoranes, RPF₄(R = Me, Ph, or Me₂N), and trifluorophosphoranes, R¹R²PF₃(R¹= Me, R²= Ph, and R¹= R²= Ph, but not R¹= R²= Me), to give the anionic species Cs+[RPF₅]^–and Cs+[R¹R²PF₄]^– respectively. In the aminolysis of trifluorophosphoranes, R¹R²PF₃, the novel difluorophos-phoranes, R¹R²PF₂NR³₂. were obtained. The characterisation of the fluorophosphate anions and difluorophosphoranes by n.m.r. spectroscopy is described.