Abstract

A series of Mg(ii) and Zn(ii) catalen complexes have been prepared for PLA formation and recycling.

Highlights

  • The current plastics economy remains fundamentally limited, dominated by petroleumbased products operating within a linear model, which underpins mounting environmental concerns

  • Synthesis The catalen ligands were prepared via a simple two-step synthesis (Scheme 1), exploiting successive condensation reactions, and characterised by 1H NMR spectroscopy and mass spectrometry (MS). 1H NMR spectroscopic analysis revealed a characteristic singlet at ca. δ = 8.40 ppm, corresponding to a HCvN resonance, confirming formation of the imine

  • The –CH2 resonances were observed as two distinct triplets between ca. δ = 3.40 and 3.80 ppm

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Summary

Introduction

Inexpensive, lightweight and robust, plastics remain a tremendous source of social and economic value, providing 1.6 million jobs and turning over € 360 billion in 2018 in Europe alone.1,2 the current plastics economy remains fundamentally limited, dominated by petroleumbased products operating within a linear model, which underpins mounting environmental concerns.3–8 Ocean plastics typify the severity of current plastic pollution with the Great Pacific Garbage Patch (GPGB), an accumulation zone of ocean plastics, encompassing ca. 1.6 million km2, equivalent to three times the area of France.9 This has stimulated considerable research into renewable and environmentally friendly alternatives, for example poly(lactic acid) (PLA). All Zn(II)-complexes exhibited good activity at 130 °C, achieving reasonably high conversion within 20 minutes {[rac-LA] : [M] : [BnOH] = 300 : 1 : 1} (Table 1).

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Conclusion
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