Relay transesterification strategy for direct synthesis of high-purity glycolide from methyl glycolate

IF 4.5 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Xiaofeng Xu, Dai Zhang, Yifei Wang, Yueqiang Cao, Wei Li, Jinghong Zhou, Xinggui Zhou
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引用次数: 0

Abstract

High-purity glycolide is a key monomer for the synthesis of biodegradable polyglycolic acid. Here, we report a relay transesterification strategy for synthesizing high-purity glycolide directly from methyl glycolate, by using behenyl alcohol as a recyclable transesterification agent. This strategy achieves an average purity of 99.3% for glycolide without forming oligomers, and thus can avoid the energy-intensive purification required in the conventional route. Mechanistic studies indicate that methyl glycolate is first converted into behenyl glycolate via hetero-intermolecular transesterification during the relay transesterification process, and then the behenyl glycolate undergoes a homo-intermolecular transesterification to form behenyl dimer glycolate, which then undergoes intramolecular backbiting transesterification to yield glycolide and behenyl alcohol.

由乙醇酸甲酯直接合成高纯度乙醇酸酯的接力酯交换策略
高纯度乙醇酸是合成生物可降解聚乙醇酸的关键单体。在这里,我们报告了一种接力酯交换策略,直接从乙醇酸甲酯合成高纯度的乙醇内酯,使用下苯乙烯醇作为可回收的酯交换剂。该策略在不形成低聚物的情况下实现了乙醇内酯99.3%的平均纯度,从而避免了传统途径所需的高能耗净化。机理研究表明,在继代酯交换过程中,乙醇酸甲酯首先通过异分子间酯交换转化为乙醇酸甲酯,然后乙醇酸甲酯再经过同质分子间酯交换形成乙醇酸二聚体,再经过分子内反向酯交换生成乙醇酸酯和乙醇醇。
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来源期刊
CiteScore
7.60
自引率
6.70%
发文量
868
审稿时长
1 months
期刊介绍: Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.
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