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Biodegradable cyclic polyesters are synthesized by using an ε-caprolactone polymerization initiated by a cyclic tin alkoxide, followed by the addition and sequential polymerization of a few units of α-(1-acryloxyethyl)-ε-caprolactone. Tadpole-shaped polyesters with two tails of controllable length are readily prepared by this procedure (see picture).
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Li et al. (2006) studied this question.
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