Alkali-Metal Monophenolates with a Sandwich-Type Catalytic Center as Catalysts for Highly Isoselective Polymerization of rac-Lactide.
ACS Macro Lett
; 4(5): 556-560, 2015 May 19.
Article
em En
| MEDLINE
| ID: mdl-35596285
ABSTRACT
Highly isoselective ring-opening polymerization (ROP) of rac-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 rac-lactide and show high isoselectivities with Pm values of 0.72-0.82. The best isoselectivity of Pm = 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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MEDLINE
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En
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2015
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Article