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Highly
isoselective ring-opening polymerization (ROP) of <i>rac</i>-lactide is a challenge for sodium and potassium complexes
under mild conditions. In this work, three sodium and potassium complexes
with a sandwich-type catalytic center are highly active catalysts
for the polymerization of <i>rac</i>-lactide and show high
isoselectivities with <i>P</i><sub><i>m</i></sub> values of 0.72–0.82. The best isoselectivity of <i>P</i><sub><i>m</i></sub> = 0.82 is the highest value for alkali-metal
complexes under mild conditions. The molecular weights of the obtained
PLA are close to the theoretical values, and the molecular weight
distributions are narrow
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