Novel Aluminum Complexes Bearing 2-(Aminomethylene)malonate Ligands with High Efficiency and Controllability in Ring-Opening Polymerization of ε-Caprolactone

Publication date: Available online 28 March 2019Source: European Polymer JournalAuthor(s): Chi-Chi Chang, Yung-Chi Chang, Wei-Yi Lu, Yi-Chun Lai, Kuo-Hui Wu, Ya-Fan Lin, Hsuan-Ying ChenAbstractA series of Al complexes bearing diethyl 2-((arylamino)methylene)malonate and diethyl 2-((alkylamino)methylene)malonate ligands (AMM ligands) were synthesized and their application in the ring-opening polymerization of ε-caprolactone was studied. All the Al complexes bearing AMM ligands exhibited higher catalytic activity (approximately 2.8–16.5 fold) than those Al complexes bearing ketiminate ligands did, except OiPrAlMe2 (2 fold lower catalytic activity). In addition, Al complexes with steric hindrance or electron-withdrawing groups in the ligands revealed the greater catalytic activity, and the chelating effect reduced the reactivity of ring-opening polymerization.Graphical abstract

Source: European Polymer Journal - March 29, 2019 Category: Chemistry Source Type: research