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Open AccessArticle
Zinc Complexes of Guanidine– and Amidine–Phenolate Ligands for the Ring-Opening Polymerization of Lactide
by
Víctor Flores-Romero
Víctor Flores-Romero
,
Jesse LeBlanc
Jesse LeBlanc
Gino G. Lavoie
Gino G. Lavoie
Department of Chemistry, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada
*
Author to whom correspondence should be addressed.
Inorganics 2025, 13(8), 265; https://doi.org/10.3390/inorganics13080265 (registering DOI)
Submission received: 7 July 2025
/
Revised: 5 August 2025
/
Accepted: 12 August 2025
/
Published: 13 August 2025
Abstract
A series of Zn complexes containing guanidine– and amidine–phenolate ligands were synthesized and evaluated as catalysts for the polymerization of rac-lactide at 130 °C, under solvent-free conditions, giving rate constants in the range of 0.71–4.37 × 10–4 s–1. Polymerization under identical conditions with the guanidine– and amidine–phenol proligands themselves used as catalysts gave values in the range of 0.30–2.45 × 10–4 s–1. The stereoselective production of polylactic acid from either the Zn complexes or the proligands was limited (Pr = 0.47–0.62). The molecular weight of the polymers was lower than expected for living polymerizations due to chain transfer and/or transesterification but were comparable to those obtained in control experiments with Sn(Oct)2.
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MDPI and ACS Style
Flores-Romero, V.; LeBlanc, J.; Lavoie, G.G.
Zinc Complexes of Guanidine– and Amidine–Phenolate Ligands for the Ring-Opening Polymerization of Lactide. Inorganics 2025, 13, 265.
https://doi.org/10.3390/inorganics13080265
AMA Style
Flores-Romero V, LeBlanc J, Lavoie GG.
Zinc Complexes of Guanidine– and Amidine–Phenolate Ligands for the Ring-Opening Polymerization of Lactide. Inorganics. 2025; 13(8):265.
https://doi.org/10.3390/inorganics13080265
Chicago/Turabian Style
Flores-Romero, Víctor, Jesse LeBlanc, and Gino G. Lavoie.
2025. "Zinc Complexes of Guanidine– and Amidine–Phenolate Ligands for the Ring-Opening Polymerization of Lactide" Inorganics 13, no. 8: 265.
https://doi.org/10.3390/inorganics13080265
APA Style
Flores-Romero, V., LeBlanc, J., & Lavoie, G. G.
(2025). Zinc Complexes of Guanidine– and Amidine–Phenolate Ligands for the Ring-Opening Polymerization of Lactide. Inorganics, 13(8), 265.
https://doi.org/10.3390/inorganics13080265
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