Mn(I)-配合物催化聚对苯二甲酸酯升级回收制α-羟基羧酸。

IF 16.9
Soham Das Adhikary, Sayan K Jana, Biplab Maji
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引用次数: 0

摘要

利用化学方法将聚对苯二甲酸乙酯(PET)废弃物转化为增值产品是解决全球塑料污染的一种很有前景的策略。在这里,我们报道了一种锰催化的一锅方法,用于串联PET解聚和无受体脱氢偶联(ADC),以选择性地生产α-羟基羧酸(α-HCAs),包括乙醇酸、乳酸和高价值衍生物,以及对苯二甲酸(TPA)和氢气。采用台架稳定的(PNP)Mn(I)螯合物,该级联工艺在温和条件下(120-140°C)运行,并容纳广泛的伯醇偶联伙伴,能够合成有价值的可生物降解聚合物前体(乙醇酸和乳酸)和更高的α-HCAs。值得注意的是,该体系对普通塑料添加剂表现出优异的耐受性,不需要耗能的预处理,实现了接近定量的TPA回收和显著的H2析出。这项工作展示了贱金属催化如何在塑料废物修复和可持续化学合成之间架起桥梁,为实现循环聚合物经济提供了一条切实可行的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mn(I)-Complex Catalyzed Upcycling of Polyethylene Terephthalate to α-Hydroxy Carboxylic Acids.

The chemical upcycling of poly(ethylene terephthalate) (PET) waste into value-added products presents a promising strategy to address global plastic pollution. Here, we report a manganese-catalyzed, one-pot approach for tandem PET depolymerization and acceptorless dehydrogenative coupling (ADC) to selectively produce α-hydroxycarboxylic acids (α-HCAs), including glycolic, lactic, and higher-value derivatives, along with terephthalic acid (TPA) and H2 gas. Employing bench-stable (PNP)Mn(I)-pincer complexes, this cascade process operates under mild conditions (120-140 °C) and accommodates a broad range of primary alcohol coupling partners, enabling the synthesis of valuable biodegradable polymer precursors (glycolic and lactic acid) and higher α-HCAs. Notably, the system exhibits exceptional tolerance to common plastic additives and requires no energy-intensive pretreatment, achieving near-quantitative TPA recovery and significant H2 evolution. This work demonstrates how base-metal catalysis can bridge plastic waste remediation and sustainable chemical synthesis, offering a practical pathway toward circular polymer economies.

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