首页|Efficient synthesis of cyclic carbonates under atmospheric CO2 by DMAP-based ionic liquids:the difference of inert hydrogen atom and active hydrogen atom in cation

Efficient synthesis of cyclic carbonates under atmospheric CO2 by DMAP-based ionic liquids:the difference of inert hydrogen atom and active hydrogen atom in cation

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The coupling reaction of carbon dioxide(CO2)and epoxides is one of the most efficient pathways to achieve the carbon balance.However,to accomplish it under the mild conditions,especially under the atmospheric pressure,is still a perplexing problem.Three novel ionic liquids(ILs),[DMAPBrPC][TMGH],[DMAPBrPC][DBUH],and[DMAPBrPC][BTMA],are designed and synthesized.All of them display the excellent catalytic activity for the title reaction achieving the yield over 96.6％under the atmospheric CO2 pressure at 60 ℃.Interestingly,[DMAPBrPC][BTMA]with the inert hydrogen atom in cation exhibits the superior catalytic activity as compared to other two ILs with the protic hydrogen atom in cation along with the same anion.The active hydrogen atom in[DMAPBrPC][TMGH]and[DMAPBrPC][DBUH]would impede the-COO-group to absorb CO2,which is an unfavorable item for the reaction.Moreover,the strong hydrogen bond in[DMAPBrPC][TMGH]and[DMAPBrPC][DBUH]would lessen the nucleophilic ability of Br-anion resulting in the inferior catalytic performance,which is further confirmed by the density functional theory(DFT)calculations.The cation without the active hydrogen atom could also be employed to design the ILs with the excellent catalytic feature when it is combined with the suitable anion.

Carbon dioxideDMAP-based ionic liquidsInert hydrogen atomDFT calculationsAtmospheric pressure

Zhengkun Zhang、Jinya Li、Guanyao Yu、Chao Zeng、Menglong Wang、Susu Huang、Li Wang、Jinglai Zhang

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Henan Province Engineering Research Center of Green Anticorrosion Technology for Magnesium Alloys,Henan University,Kaifeng,475004,China

Henan Engineering Research Center of Corrosion and Protection for Magnesium Alloys,Henan University,Kaifeng,475004,China

College of Chemistry and Chemical Engineering,Henan University,Kaifeng,475004,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaProgram of Henan Center for Outstanding Overseas ScientistsHenan University's First-Class Discipline Science and Technology Research ProjectHenan University's First-Class Discipline Science and Technology Research ProjectHenan University's First-Class Discipline Science and Technology Research ProjectExcellent Foreign Experts Project of Henan University

2197506422178087GZS20200112018YLTD072018YLZDYJ112019YLZDYJ09

2023

10.1016/j.gce.2022.06.001

绿色化学工程(英文)
中国科学院过程工程研究所

绿色化学工程(英文)

CSCD
ISSN：
年,卷(期)：2023.4(3)
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