Imino‐Pyrrole Zn(II) Complexes for the Rapid and Selective Chemical Recycling of Commodity Polymers | Zendy

Stewart Jack A. | Zendy; Powell Louis T. W. | Zendy; Cullen Matthew J. | Zendy; KociokKöhn Gabrielle | Zendy; Davidson Matthew G. | Zendy; Jones Matthew D. | Zendy

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Imino‐Pyrrole Zn(II) Complexes for the Rapid and Selective Chemical Recycling of Commodity Polymers

Author(s) -

Stewart Jack A.,

Powell Louis T. W.,

Cullen Matthew J.,

KociokKöhn Gabrielle,

Davidson Matthew G.,

Jones Matthew D.

Publication year - 2025

Publication title -

angewandte chemie

Language(s) - English

Resource type - Journals

eISSN - 1521-3757

pISSN - 0044-8249

DOI - 10.1002/ange.202502845

Subject(s) - catalysis , chemistry , degradation (telecommunications) , solvent , zinc , pyrrole , commodity chemicals , organic chemistry , polymer , telecommunications , computer science

Abstract Three imino‐pyrrole zinc complexes were prepared and applied to the rapid degradation of polylactic acid (PLA) and the depolymerization of bisphenol A polycarbonate (BPA‐PC) and polyethylene terephthalate (PET). PLA alcoholysis proceeded rapidly at a range of conditions, including reflux in air. Remarkable activity was demonstrated for the solvent‐free methanolysis of PLA at mild conditions with full conversion reached in 11 min at 80 °C. Various conditions were investigated including a range of PLA sources and, importantly, catalyst recycling was demonstrated. The methanolysis of BPA‐PC and the glycolysis of PET were achieved, the latter giving full conversion after 1.5 h for all catalysts. The chemical recycling of mixed plastic feedstocks was investigated, including the selective and sequential degradation of a PLA/BPA‐PC mixture with a single catalyst and solvent.

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