It's all about control: Alcohol adducts of stable N-heterocyclic carbenes function as excellent single-component catalysts/initiators for the ring-opening polymerization of lactide (see scheme). This polymerization can be reversibly terminated simply by modulating the temperature. The use of multifunctional macroinitiators enables the synthesis of more complex polymer architectures.
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Coulembier et al. (2005) studied this question.
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