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Lanthanides (samarium and ytterbium) tris and monobenzimidinates are efficient for the polymerization of ε-caprolactone, the systems remaining active after consumption of the monomer. Nevertheless it is not a living polymerization because the benzimidinates are recovered. Evidence for support of the proposed catalytic cycle was obtained by NMR studies.
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Barbier‐Baudry et al. (2000) studied this question.
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