Julian M. W. Chan, Haritz Sardon, et al.
ACS Macro Letters
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.
Julian M. W. Chan, Haritz Sardon, et al.
ACS Macro Letters
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Biomacromolecules
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