Polycondensations of dimethyl phosphonate with diols: SEC and 1 P and 13 C NMR spectroscopic studies

Formation of poly(ethylene phosphates) in polycondensation of H3PO4 with ethylene glycol. Kinetic and mechanistic study

“…Another coincidence of similar compositions of macromolecules differing in structures is illustrated below [macromolecules (14) and (15) (14) and (15) have the same composition, namely P nþ1 C nþ2 O 2(nþ1) H 5nþ7 , and distinction on the basis of the 31 P{ 1 H} NMR spectra is more difficult. These two populations could, however, be distinguished in MTms after methylation, since into macromolecules (14) n þ 3 methyl groups are introduced whereas into macromolecules (15) only n þ 2.…”

“…[9][10][11] Similar methods were used later in other laboratories. [12][13][14] More recently these approaches (including ROP) have successfully been used for preparation of polymers for the biomedical field (nerve guides, controlled drugs release), mostly by Leong and coworkers. [15][16][17] In our laboratories and in cooperation with other research groups, liquid membranes were prepared which were able to separate Ca þ2 and Mg þ2 and other cations, taking advantage of the known ability of the derivatives of poly(1,2-glycerol phosphates) or poly(1,3-glycerol phosphates) to flux these ions through membranes in living organisms (teichoic acids).…”

Microwave-assisted Ring-Opening Polymerization of ε-Caprolactone in Presence of Hydrogen Phosphonates

“…[39][40][41] The similarity of the chemical shift of the reaction product to that of the repeating units of these polyphosphonates strongly suggested that a transesterification between the oligo("-CL) and DIPHP occurred during the polymerization process as hypothesized in Scheme 2.…”

Microwave‐Assisted Single‐Step Synthesis of Poly(alkylene hydrogen phosphonate)s by Transesterification of Dimethyl Hydrogen Phosphonate with Poly(ethylene glycol)

“…It is known that the molecular weight of the reaction product strongly depends from the reaction time at 160 and 185 8C. It was shown that poly(alkylene hydrogen phosphonate)s with molecular weights of 5 000 Da can be obtained after heating at 160 8C for 120 h. [21] Dimethyl and diethyl hydrogen phosphonates, widely used as starting compounds for the synthesis of poly(alkylene hydrogen phosphonate)s, are thermally unstable at temperatures higher than 160 8C. One way to avoid the undesirable transformations of these organophosphorus compounds is to reduce the reaction time.…”