Jeremy Pang Kern Tan, Sung Ho Kim, et al.
European Cells and Materials
We report spirocyclic imidazolidines derived from N-heterocyclic carbenes and β-lactones. These spirocycles are initiators for the zwitterionic ring-expansion polymerization of β-lactones to generate cyclic polyesters of well-defined molecular weight. The zwitterionic strategy based on the equilibrium between the zwitterionic intermediates and spiro macrocyclics enables the controlled synthesis of cyclic poly(β-lactone)s. Copyright © 2007 American Chemical Society.
Jeremy Pang Kern Tan, Sung Ho Kim, et al.
European Cells and Materials
Robert Ono, Ashlynn L.Z. Lee, et al.
Biomacromolecules
Nathaniel H. Park, Mareva Fevre, et al.
ACS Macro Letters
Chuan Yang, Wei Cheng, et al.
Advanced Healthcare Materials