Figure 3.

(A) Magnified ¹H NMR spectra of the crude reaction mixture obtained after PUF acidolysis with AA at 220 °C for 30 min and a molar ratio of the AA/urethane group of 1.1, the isolated upper polyol phase after centrifugation of the crude reaction mixture, and the purified RP and VP of the same type, recorded in DMSO-d₆, together with the (B) magnified region typical for the quantification of the nonhydroxyl end groups of the polyol. (C) Magnified region of the ¹H NMR spectra (normalized to the polyol methyl group) of the same samples recorded in DMSO-d₆ with added TFA, showing the overlapping signals of the polyol methyne group near the urethane and ester bonds. The peak assignment refers to the structures shown in Table S4.