Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis

Grimaldi, Ilaria; Santulli, Federica; Lamberti, Marina; Mazzeo, Mina

doi:10.3390/ijms24087642

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Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis

Department of Chemistry and Biology “Adolfo Zambelli”, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy

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Int. J. Mol. Sci. 2023, 24(8), 7642; https://doi.org/10.3390/ijms24087642

Submission received: 16 March 2023 / Revised: 15 April 2023 / Accepted: 18 April 2023 / Published: 21 April 2023

(This article belongs to the Special Issue Biodegradable Polymer: From Design to Applications 2.0)

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Abstract

Salen, Salan, and Salalen chromium (III) chloride complexes have been investigated as catalysts for the ring-opening copolymerization reactions of cyclohexene oxide (CHO) with CO₂ and of phthalic anhydride (PA) with limonene oxide (LO) or cyclohexene oxide (CHO). In the production of polycarbonates, the more flexible skeleton of salalen and salan ancillary ligands favors high activity. Differently, in the copolymerization of phthalic anhydride with the epoxides, the salen complex showed the best performance. Diblock polycarbonate-polyester copolymers were selectively obtained by one-pot procedures from mixtures of CO₂, cyclohexene oxide, and phthalic anhydride with all complexes. In addition, all chromium complexes were revealed to be very active in the chemical depolymerization of polycyclohexene carbonate producing cyclohexene oxide with high selectivity, thus offering the opportunity to close the loop on the life of these materials.

Keywords: block copolymers; CO₂ fixation; chromium (III) catalysts; depolymerization; polycarbonates; polyesters

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MDPI and ACS Style

Grimaldi, I.; Santulli, F.; Lamberti, M.; Mazzeo, M. Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis. Int. J. Mol. Sci. 2023, 24, 7642. https://doi.org/10.3390/ijms24087642

AMA Style

Grimaldi I, Santulli F, Lamberti M, Mazzeo M. Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis. International Journal of Molecular Sciences. 2023; 24(8):7642. https://doi.org/10.3390/ijms24087642

Chicago/Turabian Style

Grimaldi, Ilaria, Federica Santulli, Marina Lamberti, and Mina Mazzeo. 2023. "Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis" International Journal of Molecular Sciences 24, no. 8: 7642. https://doi.org/10.3390/ijms24087642

APA Style

Grimaldi, I., Santulli, F., Lamberti, M., & Mazzeo, M. (2023). Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis. International Journal of Molecular Sciences, 24(8), 7642. https://doi.org/10.3390/ijms24087642

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Chromium Complexes Supported by Salen-Type Ligands for the Synthesis of Polyesters, Polycarbonates, and Their Copolymers through Chemoselective Catalysis

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