Scholarlink

<p>In the present study, dihydroxyethylated amarine and iso-amarine ionic salts (namely AM-OH and IAM-OH) along with diethylated amarine and iso-amarine ionic salts (namely AM-Et and IAM-Et) are firstly synthesized. Subsequently, their catalytic performance for the cycloaddition of CO<sub>2</sub> to epichlorohydrin is quantitatively compared under identical reaction conditions. As expected, dihydroxyethylated imidazolinium bromide salts exhibit notably higher catalytic activity than that of their diethylated counterparts, whereas the catalytic activity of AM-OH and IAM-OH is almost identical, highlighting the importance of H-bonding interactions. Inspired by this finding, a dihydroxyethyl-containing poly(triphenylimidazolinium) network (namely fPPIm-OH) is synthesized by one-pot reaction of dihydroxyethylated <i>cis</i>-(±)-2,4,5-tris(<i>p</i>-formylphenyl)imidazolinium bromide (PIm) with hexamethyldisilazane (HMDS) in <i>N</i>,<i>N</i>-dimethylformamide followed by treatment with excess 2-bromoethanol in CH<sub>3</sub>CN in the presence of K<sub>2</sub>CO<sub>3</sub>. The as-synthesized fPPIm-OH network with a Br<sup>−</sup> content of 2.87 mmol g<sup>−1</sup> shows high catalytic activity for the cycloaddition of CO<sub>2</sub> to epoxides, yielding almost quantitative conversion (99%) and selectivity (99%) for a wide range of epoxides. Remarkably, the fPPIm-OH also shows relatively high activity for the cycloaddition of simulated flue gas (0.15&#xa0;bar CO<sub>2</sub> + 0.85 bar N<sub>2</sub>) to epoxides, in which quantitative selectivity (99%) and high conversion (92 ~ 99%) are observed under relatively harsh conditions (80–120&#xa0;°C). This study presents a facile approach for the synthesis of novel imidazolinium-containing polymeric networks and may inspire more researches aiming at extending the aromatic multialdehydes and simultaneously enhancing the catalytic activity of the resultant polymeric networks.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hydroxyl-Functionalized Poly(triphenylimidazolinium bromide) as an Efficient Catalyst for the Cycloaddition of CO2 to Epoxides

  • 期刊论文

  • 发表日期：

    2025年4月9日

查看全文
  • Haowei Gong,
  • Bei Liu,
  • Hongbiao Chen,
  • Mei Yang,
  • Yijiang Liu,
  • Huaming Li

摘要

In the present study, dihydroxyethylated amarine and iso-amarine ionic salts (namely AM-OH and IAM-OH) along with diethylated amarine and iso-amarine ionic salts (namely AM-Et and IAM-Et) are firstly synthesized. Subsequently, their catalytic performance for the cycloaddition of CO2 to epichlorohydrin is quantitatively compared under identical reaction conditions. As expected, dihydroxyethylated imidazolinium bromide salts exhibit notably higher catalytic activity than that of their diethylated counterparts, whereas the catalytic activity of AM-OH and IAM-OH is almost identical, highlighting the importance of H-bonding interactions. Inspired by this finding, a dihydroxyethyl-containing poly(triphenylimidazolinium) network (namely fPPIm-OH) is synthesized by one-pot reaction of dihydroxyethylated cis-(±)-2,4,5-tris(p-formylphenyl)imidazolinium bromide (PIm) with hexamethyldisilazane (HMDS) in N,N-dimethylformamide followed by treatment with excess 2-bromoethanol in CH3CN in the presence of K2CO3. The as-synthesized fPPIm-OH network with a Br− content of 2.87 mmol g−1 shows high catalytic activity for the cycloaddition of CO2 to epoxides, yielding almost quantitative conversion (99%) and selectivity (99%) for a wide range of epoxides. Remarkably, the fPPIm-OH also shows relatively high activity for the cycloaddition of simulated flue gas (0.15 bar CO2 + 0.85 bar N2) to epoxides, in which quantitative selectivity (99%) and high conversion (92 ~ 99%) are observed under relatively harsh conditions (80–120 °C). This study presents a facile approach for the synthesis of novel imidazolinium-containing polymeric networks and may inspire more researches aiming at extending the aromatic multialdehydes and simultaneously enhancing the catalytic activity of the resultant polymeric networks.

Graphical Abstract