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Iron-catalyzed reactions of CO2 and epoxides to yield cyclic and polycarbonates

Polymer Journal volume 53, pages 29–46 (2021)Cite this article

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Abstract

The catalytic coupling and polymerization of CO2 and epoxides has been studied for over 50 years. While traditionally dominated by catalytic systems containing cobalt, chromium, and zinc, the use of iron catalysts has emerged in the past 10 years. This review provides an overview of the homogeneous iron-catalyzed transformations of carbon dioxide and epoxides to yield cyclic and/or polycarbonates. It is important to note the potential for cyclic carbonates to be used as monomers for polymer formation via transesterification or by ring-opening polymerization in some cases, e.g., cyclohexene carbonate. Typical catalytic systems are composed of a Lewis acidic iron center and an anionic nucleophilic source, either through an anionic group weakly bound to the metal center or the addition of an external cocatalyst, cooperatively described as a binary catalytic system. This review is divided into two sections: (1) iron catalysts for cyclic carbonates and (2) iron catalysts for polycarbonates. At the end of each section, a table summarizes each catalytic system and the reaction conditions utilized in an attempt to provide a clearer comparison across the literature. Focus is given to highlighting differences in product selectivity, reaction conditions, and relative amounts of cocatalyst used.

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Acknowledgements

We would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for financial support, including a Discovery Grant (FMK). KAA is supported by a Vanier Canada Graduate Scholarship.

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  1. Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada

    Kori A. Andrea & Francesca M. Kerton

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Correspondence to Francesca M. Kerton.

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Andrea, K.A., Kerton, F.M. Iron-catalyzed reactions of CO2 and epoxides to yield cyclic and polycarbonates. Polym J 53, 29–46 (2021). https://doi.org/10.1038/s41428-020-00395-6

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