Polyhydroxyurethanes (PHU) were synthesized by polyaddition of the BisCC obtained according to the procedure described previously. To do so, 0.5 eq. of amine Ai (where i = 1 or 2) were added to the in-situ generated BisCC-XAi (where X = E or T). Reactions were carried out at 80 °C for a period of 20 h. In all cases, the reaction is brought close to completion (conversions are reported in Table ). The resulting polymers contain a simple repeating unit, diHU-Ai. They are noted poly(XAi), where X stands for the vicinal dicarbonate used in step 1, and Ai stands for the amine used in step 1 and step 2.