M. Meisel, DONOR-STABILIZED MONOMETAPHOSPHATES AS STARTING COMPOUNDS FOR PHOSPHORUS-HETEROCYCLES, Phosphorus, sulfur and silicon and the related elements, 76(1-4), 1993, pp. 359-362
The reaction of donor-stabilized metaphosphoric acid derivatives like
pyPX2Y or Py2*P2S5 with proton-active nucleophiles leads presumably t
o the intermediary formation of the corresponding monometaphosphate sp
ecies which react via cyclo- or polyaddition to cyclic, and linear oli
gomeric or polymeric phosphorus compounds.