当前位置：
X-MOL 学术
›
Catal. Sci. Technol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Strategy of regulating the electrophilic/nucleophilic ability by ionic ratio in poly(ionic liquid)s to control the coupling reaction of epoxide
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-08-10 , DOI: 10.1039/d1cy01024g Shengxin Chen 1, 2 , Ran An 2 , Yingwei Li 2, 3 , Yuting Zhu 2, 4 , XinBao Zhu 4 , Ruixia Liu 2, 3 , Xingang Li 1
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-08-10 , DOI: 10.1039/d1cy01024g Shengxin Chen 1, 2 , Ran An 2 , Yingwei Li 2, 3 , Yuting Zhu 2, 4 , XinBao Zhu 4 , Ruixia Liu 2, 3 , Xingang Li 1
Affiliation
|
Although poly(ionic liquid)s (PILs) have received extensive attention and research, the strategy for designing efficient PILs catalysts remains a challenge. This work reports a series of efficient PILs catalysts with increasing ionic ratio and various anion species to regulate electrophilic/nucleophilic ability, and explores the effect of the ionic ratio on the coupling reaction of propylene oxide (PO) with CO2 or methanol. These PILs are synthesized by a quaternization reaction between poly(N-vinylimidazole) (PVIM) and dihaloalkanes, where the amount of crosslinker of dihaloalkanes controls the ionic ratio of PILs, further affecting their microcosmic environment, morphologies and properties. It is noteworthy that the ionic ratio with IL units and imidazoline group can work as a trigger and promoter in the coupling reaction of PO with CO2 or methanol. The ionic ratio could open the reaction compared with the parent PVIM and the choice of anion could turn the reaction on or off. It suggested that the active microstructure and electrophilic/nucleophilic ability of PILs could be regulated by the ionic ratio. In these active sites, the IL units-connected imidazoline group could weaken the interaction of the cation–anion, giving enhanced leaving ability of the anion, contributing to the excellent catalytic performance.
中文翻译：
聚（离子液体）中通过离子比调节亲电/亲核能力控制环氧化物偶联反应的策略
尽管聚（离子液体）（PILs）受到了广泛的关注和研究，但设计高效 PILs 催化剂的策略仍然是一个挑战。本工作报道了一系列具有增加离子比和各种阴离子物种的高效 PILs 催化剂来调节亲电/亲核能力，并探讨了离子比对环氧丙烷 (PO) 与 CO 2或甲醇偶联反应的影响。这些 PIL 是通过聚 ( N)之间的季铵化反应合成的-乙烯基咪唑) (PVIM) 和二卤代烷烃，其中二卤代烷烃的交联剂的量控制了 PIL 的离子比例，进一步影响了它们的微观环境、形态和性质。值得注意的是，离子比与 IL 单元和咪唑啉基团在 PO 与 CO 2的偶联反应中可以作为触发和促进剂或甲醇。与母体 PVIM 相比，离子比例可以打开反应，阴离子的选择可以打开或关闭反应。这表明PILs的活性微观结构和亲电/亲核能力可以通过离子比来调节。在这些活性位点，IL 单元连接的咪唑啉基团可以削弱阳离子-阴离子的相互作用，增强阴离子的离去能力，有助于实现优异的催化性能。
更新日期：2021-08-24
中文翻译：
聚（离子液体）中通过离子比调节亲电/亲核能力控制环氧化物偶联反应的策略
尽管聚（离子液体）（PILs）受到了广泛的关注和研究，但设计高效 PILs 催化剂的策略仍然是一个挑战。本工作报道了一系列具有增加离子比和各种阴离子物种的高效 PILs 催化剂来调节亲电/亲核能力，并探讨了离子比对环氧丙烷 (PO) 与 CO 2或甲醇偶联反应的影响。这些 PIL 是通过聚 ( N)之间的季铵化反应合成的-乙烯基咪唑) (PVIM) 和二卤代烷烃，其中二卤代烷烃的交联剂的量控制了 PIL 的离子比例，进一步影响了它们的微观环境、形态和性质。值得注意的是，离子比与 IL 单元和咪唑啉基团在 PO 与 CO 2的偶联反应中可以作为触发和促进剂或甲醇。与母体 PVIM 相比，离子比例可以打开反应，阴离子的选择可以打开或关闭反应。这表明PILs的活性微观结构和亲电/亲核能力可以通过离子比来调节。在这些活性位点，IL 单元连接的咪唑啉基团可以削弱阳离子-阴离子的相互作用，增强阴离子的离去能力，有助于实现优异的催化性能。
京公网安备 11010802027423号