“…Traditionally, the synthesis of ureido and ureylene materials is carried out by the reaction of amino groups with isocyanates. The most popular reagent for ureido formation is KOCN [ 3 , 7 , 8 , 9 , 17 , 18 , 19 , 20 , 21 , 22 ], which displays high reactivity and is used at temperatures from 20 to 100 °C but is a toxic reagent. There has been a growing interest to find non-isocyanate routes for the synthesis of polyurethane, polyurea and ureido-functionalized materials [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”