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Catalytic performance of pyridinium dihydrogen phosphate ionic liquid for butyl acetate production: theoretical insights and reaction kinetic studies. REACTION KINETICS MECHANISMS AND CATALYSIS 2022. [DOI: 10.1007/s11144-022-02292-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wei C, Liu Z, Tan H, Huang L, Li J. A non-metal route to realize the bio-based polyester of poly(hexylene succinate): preparation conditions, side-reactions and mechanism in sulfonic acid-functionalized Brønsted acidic ionic liquids. RSC Adv 2020; 10:35381-35388. [PMID: 35515662 PMCID: PMC9056888 DOI: 10.1039/d0ra07157a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 09/16/2020] [Indexed: 01/01/2023] Open
Abstract
A biodegradable linear bio-based polyester of poly(hexylene succinate) was effectively prepared in non-metal sulfonic acid-functionalized Brønsted acidic ionic liquids (SFBAILs) as both the catalyst and the polymerization medium, and the processes of polycondensation and post-polycondensation in SFBAILs were also investigated. In addition, the side reactions which were detrimental to the growth of M w of poly(hexylene succinate) were evaluated and the synthesis mechanism of poly(hexylene succinate) catalyzed by SFBAILs was discussed with the help of DFT calculations. The result shows that both the imidazole ring and the sulfonic group on cations of SFBAILs play an important role in the catalytic process.
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Affiliation(s)
- Chenyang Wei
- BNU Key Lab of Environmentally Friendly and Functional Polymer Materials, Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University Beijing 100875 China +86 10 58802075 +86-10-58806896
| | - Zhengping Liu
- BNU Key Lab of Environmentally Friendly and Functional Polymer Materials, Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University Beijing 100875 China +86 10 58802075 +86-10-58806896
| | - Hongwei Tan
- BNU Institute of Theoretical and Physical Chemistry, College of Chemistry, Beijing Normal University Beijing 100875 China
| | - Liyan Huang
- BNU Key Lab of Environmentally Friendly and Functional Polymer Materials, Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University Beijing 100875 China +86 10 58802075 +86-10-58806896
| | - Jun Li
- BNU Key Lab of Environmentally Friendly and Functional Polymer Materials, Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University Beijing 100875 China +86 10 58802075 +86-10-58806896
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Roy Goswami S, Wang S, Gnanasekar P, Chauhan P, Yan N. Catalyst-free esterification of high amylose starch with maleic anhydride in 1-butyl-3-methylimidazolium chloride: The effect of amylose content on the degree of MA substitution. Carbohydr Polym 2020; 234:115892. [PMID: 32070512 DOI: 10.1016/j.carbpol.2020.115892] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 01/15/2020] [Accepted: 01/18/2020] [Indexed: 12/15/2022]
Abstract
The limited reactivity of starch towards maleic anhydride (MA) affords maleate with a low degree of MA substitutions (CC and COOH groups). In this study, we investigated the relationship between the starch structure, controlled by its amylose (AM)/amylopectin (AP) ratio, and the DS of starch maleates using C4[mim]Cl as the recyclable media, and catalyst. The results indicated that starches with varying AM/AP ratio produced maleates with comparable CC groups (DSNMR = 0.06-0.07). Following dissolution, the high amylose (DStitration = 1.17, yield = 69.2 %) and regular starches (DStitration = 1.17; yield = 59.3 %) produced high DStitration maleates (COOH groups) at MA/AGU ratio of 12:1 (80 °C, 10 min). Comparatively, DStitration value of waxy starch maleates (DStitration = 0.88, yield = 59.3 %) was lower than AM-based starches, possibly due to the crosslinking tendency of AP branches consisting of carboxylic end-groups. Interestingly, DStitration value for EHCS (1.17) ranged between its bulk (DSNMR: 0.06) and surface distribution of MA (DSSXPS 1.7); therefore, we considered it reliable for future reference.
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Affiliation(s)
- Shrestha Roy Goswami
- Graduate Department of Forestry, John H. Daniels Faculty of Architecture, Landscape and Design, University of Toronto, 33 Willcocks Street, Toronto, ON M5S 3B3, Canada
| | - Sen Wang
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada
| | - Pitchaimari Gnanasekar
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada
| | - Prashant Chauhan
- Graduate Department of Forestry, John H. Daniels Faculty of Architecture, Landscape and Design, University of Toronto, 33 Willcocks Street, Toronto, ON M5S 3B3, Canada; Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada
| | - Ning Yan
- Graduate Department of Forestry, John H. Daniels Faculty of Architecture, Landscape and Design, University of Toronto, 33 Willcocks Street, Toronto, ON M5S 3B3, Canada; Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada.
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Tankov I, Yankova R. Quantum mechanical and reaction dynamics investigation of butyl acetate synthesis in the presence of pyridinium hydrogen sulfate. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.072] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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DFT analysis, reaction kinetics and mechanism of esterification using pyridinium nitrate as a green catalyst. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.087] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Feng L, Ye R, Yuan T, Zhang X, Lu GP, Zhou B. A concerted addition mechanism in [Hmim]Br-triggered thiol–ene reactions: a typical “ionic liquid effect” revealed by DFT and experimental studies. NEW J CHEM 2019. [DOI: 10.1039/c8nj05674a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The π+–π and H-bond interactions between [Hmim]Br and substrates promote a special one-step addition mechanism in thiol–ene reactions.
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Affiliation(s)
- Lin Feng
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Renlong Ye
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Tao Yuan
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Xiao Zhang
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Guo-ping Lu
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Baojing Zhou
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
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Tankov I, Yankova R. Theoretical (density functional theory) studies on the structural, electronic and catalytic properties of the ionic liquid 4-amino-1H-1,2,4-triazolium nitrate. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.08.041] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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