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We report the synthesis of poly(ε-caprolactone) utilizing N-heterocyclic carbene (NHC) organocatalysts. Sterically unencumbered NHCs were found to be highly effective for the living ring-opening polymerization of ε-caprolactone under mild conditions. The NHCs were able to produce poly(ε-caprolactone)s with controlled molecular weights, low polydispersities, and well-defined end groups derived from the alcohol initiator. Star-shaped poly(ε-caprolactone)s with three and four arms were prepared using NHC organocatalysts and characterized by 1H NMR and GPC.
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Kamber et al. (2009) studied this question.
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