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β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

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Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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合成高交联聚合物与深度欧性溶剂来增强CO2的选择性

Liang Ding1, Nadhita Chanchaona1, Kristina Konstas2

  • 1School of Engineering, The University of Edinburgh, Kings Building, Edinburgh, EH93FB, United Kingdom.

ChemSusChem
|February 1, 2024
PubMed
概括

研究人员开发了一种更绿色的方法来合成超交联聚合物 (HCPs),使用深度性溶剂 (DES) 而不是危险的化溶剂. 这种新的方法提高了气体分离材料的CO2/N2选择性.

关键词:
CO2/N2 的选择性.深层欧性溶剂 深层欧性溶剂超交叉连接的聚合物

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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 绿色化学 绿色化学

背景情况:

  • 超交联聚合物 (HCP) 对于离子交换和气体分离等应用至关重要.
  • 传统的HCP合成依赖于有毒的素溶剂,造成环境和健康风险.

研究的目的:

  • 为了研究在HCP合成中用深度性溶剂 (DES) 取代危险的化溶剂的可行性.
  • 探索DES作为Friedel Crafts化中的溶剂和催化剂的有效性,用于聚合物交叉链接.

主要方法:

  • 使用两个不同的DES配方合成HCP:[ChCl][ZnCl2]2和[ChCl][FeCl3]2.2.
  • 采用了内部和外部交叉连接策略.
  • 描述了合成的HCP,重点是表面积,孔径分布和气体选择性.

主要成果:

  • 在DES中合成的HCP与用素溶剂制成的HCP相比,其特异性表面积比20-60%更低.
  • 显著提高了CO2/N2选择性,达到高达453%的较高值.
  • 通过内部交叉连接在[ChCl][ZnCl2]2中合成的聚α,α'-二chloro-p-xylene实现了105.5的CO2/N2选择性.

结论:

  • 深度环氧溶剂为HCP合成提供了一种可行的,更绿色的替代物,而不是化溶剂.
  • 在DES中合成的HCP具有较窄的孔径分布,从而提高了气体分离性能,特别是对于CO2/N2选择性.