POLYMERISATION OF CYCLIC ESTERS AND CYCLIC AMIDES

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A catalytic process for the polymerisation of cyclic ester and cyclic amides is described, which uses, as catalysts, Rare-earth complexes comprising permethylpentalene or (hydro)permethylpentalene ligands. The complexes are notably more active in lactide polymerisation that zirconium-containing analogues.