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, R1R2PF2NR3 2. were obtained. The characterisation of the fluorophosphate anions and difluorophosphoranes by n.m.r. spectroscopy is described.

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