Conditions of synthesis of poly(ethylene phosphates) in reaction of H 3 PO 4 with HOCH 2 CH 2 OH (EG), the actual path of polycondensation, and structure of the obtained polymers (mostly oligomers) and kinetics of reaction are described. Preliminary kinetic information, based on the comparison of the MALDI-TOF-ms and 31 P{ 1 H} NMR spectra as a function of conversion is given as well. Because of the dealkylation process fragments derived from di-and triethylene glycols are also present in the repeating units. Structures of the end groups (À ÀCH 2 CH 2 OH or À ÀOP(O)(OH) 2 ) depend on the starting ratio of [EG]

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Methods of preparation of the phosphoric ester of monomethyl ether of poly(ethylene glycol) (MPEG-P) from MPEG (M(n) = 550 and 2000) and phosphoric acid (P), or its derivatives - pyrophosphoric acid (PY), polyphosphoric acid (PP) and POCl(3)- are described and compared. MPEG-P was isolated in a pure state (no detectable impurities) and characterized.