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ROP OF CYCLIC ESTERS FACILITATED BY COMPLEXES OF FLEXIBLE BIGUANIDE LIGAND

Authors: Vlk Lukáš | Théron Benjamin | Chlupatý Tomáš | Růžičková Zdeňka | Breilly Damien | Hoffmannová Alena | Malacea-Kabbara Raluca | Le Gendre Pierre | Růžička Aleš

Year: 2025

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

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Language	Name	Abstract	Keywords
eng	ROP OF CYCLIC ESTERS FACILITATED BY COMPLEXES OF FLEXIBLE BIGUANIDE LIGAND	One of the biggest drawbacks in modern polymer chemistry is the heavy impact of petrol-based plastics on the environment. Efforts to introduce bio-degradable polymers lead to the family of cyclic esters – most prominently lactide available from renewable natural sources.1 However, the most common industrial catalyst for ring-opening polymerization (ROP) of lactide to polylactic acid (PLA) is tin octoate, which has been determined as toxic. A suitable replacement has not been yet introduced, although several transition or main group metal compounds (oxides, alkoxides and a plethora of complexes) were used for ROP of lactide in recent years. One of the most active systems employed an N-donor multidentate ligands stabilizing metal amides.2 Our research has developed a capable ligand platform for controlled structural arrangement of multimetallic guanidinate/biguanide complexes. We report efficient Mg and Zn-based catalysts for ROP of cyclic esters, demonstrated on monomers like lactide, ε-caprolactone, β-butyrolactone and trimethylenecarbonate. The most efficient catalysts surpassed turn-over frequencies of 60 000 h-1 in lactide ROP. Moreover, diand triblock co-polymers of some combinations of rac-, L-, D-lactide, and βbutyrolactone were obtained in immortal catalytic conditions, showcasing the power of a truly universal, active and immortal catalyst.