“…On the other hand, interesting results in PU synthesis have been achieved by the strong bases catalyzed polycondensation of CO 2 derivatives, namely organic carbamates, with diamine. ,− Although organic carbamates can be achieved by the condensation reaction of amines, CO 2 , and alcohols, the main applied synthetic procedure is through the aminolysis of organic carbonates (OCs). − Therefore, a step forward for both atom economy and process simplification is the direct synthesis of PU from OCs such as linear (dimethyl, DMC) and cyclic (ethylene and propylene) aliphatic carbonates or linear aromatic carbonate (diphenyl carbonate, DPC). − Although greener, the last approaches show some drawbacks for industrial applications. First of all, OCs generally show lower reactivity if compared to isocyanates; , then, the use of both solvents (e.g., tetramethylenesulfone or toluene) and, in most of the cases, homogeneous catalytic bases (e.g., 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), 1,8-diaza-bicyclo[5.4.0]undec-7-ene (DBU), 2-hydroxypyridine, and potassium methoxide or tert -butoxide) cannot be avoided. ,,− ,− In this way, we could meet difficulty in handling, recovering, and reusing the catalytic system, and lastly we cannot avoid relatively high reaction temperatures.…”