In one of their publications, the Johnson group 17 studied the effect of substituents on a thionolactone, DOT, during its copolymerization with styrene at 70°C in toluene, initiated by AIBN. They specifically examined how electron-withdrawing and/or electron-donating groups at the para position of aryl groups (related to the α and δ positions of DOT) influence the reactivity of this thionolactone during copolymerization. To achieve this, several X-Y-DOT compounds were investigated (Figure ). 17 Copyright 2022 American Chemical Society.