Ethyl metaphosphate was generated in toluene solution in the presence of suspended anhydrous silica gel; the weight gain, P content, and the 31P n.m.r. spectrum of the solid, after thorough washing, showed that the hydroxy groups on the surface had been phosphorylated, and that further reaction of the initially formed monophosphate had produced pyrophosphate groups on the surface.
L. D. Quin, A. N. Hughes, X. Wu and L. C. Dickinson, J. Chem. Soc., Chem. Commun., 1988, 555 DOI: 10.1039/C39880000555
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