1
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Zhang N, Xue Z, Shi L, Luo G. Unveiling the Detailed Mechanism and Origins of Chemo-, Regio-, and Stereoselectivity of Rare-Earth Catalyzed Alternating Copolymerization of Polar and Nonpolar Olefins. Inorg Chem 2024; 63:3544-3559. [PMID: 38308632 DOI: 10.1021/acs.inorgchem.3c04428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2024]
Abstract
The direct copolymerization of polar and nonpolar olefins is of great interest and significance, as it is the most atom-economical and straightforward strategy for the synthesis of functional polyolefin materials. Despite considerable efforts, the precise control of monomer-sequence and their regio- and stereochemistry is full of challenges, and the related mechanistic origins are still in their infancy to date. Herein, the mechanistic studies on the model reaction of Sc-catalyzed co-syndiospecific alternating copolymerization of anisylpropylene (AP) and styrene were performed by DFT calculations. The results suggest that the subtle balance between electronic and steric factors plays an important role during monomer insertions, and a new amino-dissociated mechanism was proposed for AP insertion at chain initiation. AP insertion follows the 2,1-si-insertion pattern, which is mainly controlled by steric factors caused by the restricted MeO···Sc interaction. As for styrene insertion, it prefers the 2,1-re-insertion manner and its regio- and stereoselectivities are influenced by steric repulsions between the inserting styrene and the polymer chain or the ligand. More interestingly, it is found that the alternating monomer-sequence is mainly determined by the "steric matching" principle, which is quantitatively expressed by the buried volume of the metal center of the preinserted species. The concept of steric pocket has been successfully applied to explain the different performances of several catalysts and other alternating copolymerization reactions. The insightful mechanistic findings and the quantitative steric pocket model present here are expected to promote rational design of new rare-earth catalysts for developing regio-, stereo-, and sequence-controlled copolymerization of specific polar and nonpolar olefins.
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Affiliation(s)
- Ni Zhang
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Zuqian Xue
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Lei Shi
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Gen Luo
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
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2
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Li J, Wang J. Palladium-catalyzed generation of CO from formic acid for alkoxycarbonylation of internal alkenes involves a PTSA-assisted NH-Pd mechanism: a DFT mechanistic study. Phys Chem Chem Phys 2023; 25:2294-2303. [PMID: 36597910 DOI: 10.1039/d2cp04231b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
DFT calculations have been performed to find the mechanism of the alkyloxycarbonylation of an internal alkene with HCOOH catalyzed by a palladium complex with P,N hemilabile ligands. Four different cycles have been explored in detail, and a plausible catalytic cycle involves the decomposition of HCOOH/HCOOMe to CO, internal alkene isomerization, terminal alkene insertion, CO migratory insertion and methanolysis. It is shown that decomposition and isomerization processes involve a cooperative P,N hemilabile ligand and Pd(0) (NH-Pd) rather than the Pd(II) hydride (Pd-H) mechanism. Intriguingly, the simultaneous presence of PTSA acts as a hydrogen shuttle (H-shuttle), assisting CO generation and methanolysis. With such a mechanism, the rate-determining transition state corresponds to internal alkene isomerization, which is consistent with the experimental observation that isomerization was the slow step in this process. The back-bonding between palladium and olefin and rapid hydrogen transfer in the presence of a PTSA H-shuttle are responsible for the moderate barriers. In addition, a careful study of the solvent effect indicates that polar solvents, which are capable of hydrogen bonding, can promote the catalytic reactions. Mechanistic insights gained by this theoretical study have not only rationalized the experimental observations well but also have implications for new reaction development.
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Affiliation(s)
- Jingjing Li
- Department of Basic Education, Shanxi Agricultural University, Taigu Shanxi, 030801, P. R. China.
| | - Jinzhao Wang
- Institute of Theoretical Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China
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3
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Zhang W, Hu J, Bi S, Ling B, Yuan XA, Jiang YY. Insights into α-Alkynylation and α-Allenylation of Aldehydes under the Synergisitic Catalysis of Gold/Amine: A DFT Study. J Org Chem 2022; 87:13102-13110. [DOI: 10.1021/acs.joc.2c01596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wanying Zhang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Jingjing Hu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Siwei Bi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Baoping Ling
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Xiang-Ai Yuan
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Yuan-Ye Jiang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
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4
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Zhang X, Zhou S, Wang D, Zhang L, Wei Y, Zhu X, Cui P, Luo G, Wang S. Syntheses of Rare-Earth Metal Alkyl Complexes Bearing a Dianionic α-Iminopyridyl Ligand and Their Catalytic Activities toward Polymerization of 2-Vinylpyridine. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00470] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Xiuli Zhang
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Shuangliu Zhou
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Donghan Wang
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Lijun Zhang
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Yun Wei
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Xiancui Zhu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Peng Cui
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Gen Luo
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Shaowu Wang
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
- Anhui Laboratory of Functional Complexes for Materials Chemistry and Application, College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China
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5
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Tang J, Xie T, Yuan Y, Hua J, Zhuang T, Luo Y, Geng J. Degradation of Polydienes Induced by Alkyllithium: Characterization and Reaction Mechanism. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c01934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jian Tang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, P.R. China
| | - Tinghao Xie
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, P.R. China
| | - Yuka Yuan
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, P.R. China
| | - Jing Hua
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, P.R. China
| | - Tao Zhuang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, P.R. China
| | - Yi Luo
- School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, P.R. China
| | - Jieting Geng
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, P.R. China
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6
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Xu Y, Shao Y, Ahlquist MSG, Yu H, Fu Y. Pivotal Electron Delivery Effect of the Cobalt Catalyst in Photocarboxylation of Alkynes: A DFT Calculation. J Org Chem 2021; 86:1540-1548. [PMID: 33353304 DOI: 10.1021/acs.joc.0c02393] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Photocarboxylation of alkyne with carbon dioxide represents a highly attractive strategy to prepare functionalized alkenes with high efficiency and atomic economy. However, the reaction mechanism, especially the sequence of elementary steps (leading to different reaction pathways), reaction modes of the H-transfer step and carboxylation step, spin and charge states of the cobalt catalyst, etc., is still an open question. Herein, density functional theory calculations are carried out to probe the mechanism of the Ir/Co-catalyzed photocarboxylation of alkynes. The overall catalytic cycle mainly consists of four steps: reductive-quenching of the Ir catalyst, hydrogen transfer (rate-determining step), outer sphere carboxylation, and the final catalyst regeneration step. Importantly, the cobalt catalyst can facilitate the H-transfer by an uncommon hydride coupled electron transfer (HCET) process. The pivotal electron delivery effect of the Co center enables a facile H-transfer to the α-C(alkyne) of the aryl group, resulting in the high regioselectivity for β-carboxylation.
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Affiliation(s)
- Yuantai Xu
- Department of Chemistry, Center for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, People's Republic of China.,Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yifan Shao
- Department of Chemistry, Center for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, People's Republic of China
| | - Mårten S G Ahlquist
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - Haizhu Yu
- Department of Chemistry, Center for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, People's Republic of China
| | - Yao Fu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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7
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Stabilization strategies in biomass depolymerization using chemical functionalization. Nat Rev Chem 2020; 4:311-330. [PMID: 37127959 DOI: 10.1038/s41570-020-0187-y] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2020] [Indexed: 12/26/2022]
Abstract
A central feature of most lignocellulosic-biomass-valorization strategies is the depolymerization of all its three major constituents: cellulose and hemicellulose to simple sugars, and lignin to phenolic monomers. However, reactive intermediates, generally resulting from dehydration reactions, can participate in undesirable condensation pathways during biomass deconstruction, which have posed fundamental challenges to commercial biomass valorization. Thus, new strategies specifically aim to suppress condensations of reactive intermediates, either avoiding their formation by functionalizing the native structure or intermediates or selectively transforming these intermediates into stable derivatives. These strategies have provided unforeseen upgrading pathways, products and process solutions. In this Review, we outline the molecular driving forces that shape the deconstruction landscape and describe the strategies for chemical functionalization. We then offer an outlook on further developments and the potential of these strategies to sustainably produce renewable-platform chemicals.
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8
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Wang P, Zhang J, Han L, Bi S, Liu T. Substituent-dependent generation of tricyclic frameworks by the rhodium-catalyzed cycloisomerization of homopropargyl allene-alkynes: a theoretical study. Dalton Trans 2020; 49:7406-7419. [DOI: 10.1039/d0dt00508h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Polycyclic compounds having biological activities can be modified by employing different substituents.
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Affiliation(s)
- Ping Wang
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
| | - Jing Zhang
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
| | - Lingli Han
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
| | - Siwei Bi
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- China
| | - Tao Liu
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
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9
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Cao Y, Chen SS, Zhang S, Ok YS, Matsagar BM, Wu KCW, Tsang DCW. Advances in lignin valorization towards bio-based chemicals and fuels: Lignin biorefinery. BIORESOURCE TECHNOLOGY 2019; 291:121878. [PMID: 31377047 DOI: 10.1016/j.biortech.2019.121878] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/20/2019] [Accepted: 07/22/2019] [Indexed: 05/13/2023]
Abstract
Lignin is one of the most promising renewable sources for aromatic hydrocarbons, while effective depolymerization towards its constituent monomers is a particular challenge because of the structural complexity and stability. Intensive research efforts have been directed towards exploiting effective valorization of lignin for the production of bio-based platform chemicals and fuels. The present contribution aims to provide a critical review of key advances in the identification of exact lignin structure subjected to various fractionation technologies and demonstrate the key roles of lignin structures in depolymerization for unique functionalized products. Various technologies (e.g., thermocatalytic approaches, photocatalytic conversion, and mechanochemical depolymerization) are reviewed and evaluated in terms of feasibility and potential for further upgrading. Overall, advances in pristine lignin structure analysis and conversion technologies can facilitate recovery and subsequent utilization of lignin towards tailored commodity chemicals and fungible fuels.
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Affiliation(s)
- Yang Cao
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Season S Chen
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Shicheng Zhang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Yong Sik Ok
- Korea Biochar Research Center & Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Babasaheb M Matsagar
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Kevin C-W Wu
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
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10
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Zhang T, Zhang Y, Wang Y, Huo F, Li Z, Zeng Q, He H, Li X. Theoretical Insights Into the Depolymerization Mechanism of Lignin to Methyl p-hydroxycinnamate by [Bmim][FeCl 4] Ionic Liquid. Front Chem 2019; 7:446. [PMID: 31275927 PMCID: PMC6591258 DOI: 10.3389/fchem.2019.00446] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 05/31/2019] [Indexed: 11/30/2022] Open
Abstract
Depolymerization of lignin into valuable aromatic compounds is an important starting point for its valorization strategies, which requires the cleavage of C-O and C-C bonds between lignin monomer units. The catalytic cleavage of these bonds is still difficult and challenging. Our previous experimental investigation (Green Chem., 2018, 20: 3743) has shown that methyl p-hydroxycinnamate (MPC) can be produced from molecular tailoring of H unit in lignin by the cleavage of the γ-O ester bond. In this study, the mechanism of [Bmim][FeCl4]-catalyzed depolymerization of lignin was investigated by using the density functional theory (DFT) method. The results reveal that [FeCl4]- anion of the catalyst plays a decisive role in the whole catalytic process, where two possible activation modes including three different potential reaction pathways can realize the depolymerization of lignin model compound. The calculated overall barriers of the catalytic conversion along these potential routes show that the third potential pathway, i.e., methanol firstly activated by [Bmim][FeCl4], has the most probability with the lowest energy barrier, while the second pathway is excluded because the energy barrier is too high. Also, the results illustrate that the solvent effect is beneficial to the reduction of the relative energy for the reaction to form the transition states. Hence, the obtained molecular level information can identify the favorable conversion process catalyzed by metallic ionic liquids to a certain extent, and it is desirable to enhance the utilization of biomass as a ubiquitous feedstock.
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Affiliation(s)
- Tian Zhang
- State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Yaqin Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Yanlei Wang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Feng Huo
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Zhangmin Li
- State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
| | - Qiang Zeng
- State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
| | - Hongyan He
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Xuehui Li
- State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
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11
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Li J, Yang Y, Zhang D. DFT study of fructose dehydration to 5-hydroxymethylfurfural catalyzed by imidazolium-based ionic liquid. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.03.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Li BW, Wang MY, Fang S, Liu JY. DFT Study on the Mechanism of Palladium(0)-Catalyzed Reaction of Aryl Iodides, Norbornene, and Di-tert-butyldiaziridinone. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00168] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bing-wen Li
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People’s Republic of China
| | - Mei-yan Wang
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People’s Republic of China
| | - Sheng Fang
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People’s Republic of China
| | - Jing-yao Liu
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People’s Republic of China
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Zhang Y, Huo F, Wang Y, Xia Y, Tan X, Zhang S, He H. Theoretical Elucidation of β-O-4 Bond Cleavage of Lignin Model Compound Promoted by Sulfonic Acid-Functionalized Ionic Liquid. Front Chem 2019; 7:78. [PMID: 30828575 PMCID: PMC6384239 DOI: 10.3389/fchem.2019.00078] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 01/28/2019] [Indexed: 12/04/2022] Open
Abstract
While the depolymerization of lignin to chemicals catalyzed by ionic liquids has attracted significant attention, the relevant molecular mechanism, especially the cleavage of specific bonds related to efficient depolymerization, still needs to be deeply understood for the complexity of this natural aromatic polymer. This work presents a detailed understanding of the cleavage of the most abundant β-O-4 bond in the model system, guaiacylglycerol β-guaiacyl ether, by a Brønsted acidic IL (1-methyl-3-(propyl-3-sulfonate) imidazolium bisulfate ([C3SO3Hmim][HSO4]) using density functional theory calculation and molecular dynamics simulation. It has been found that [C3SO3Hmim][HSO4] generates zwitterion/H2SO4via proton transfer with an energy barrier of 0.38 kcal/mol, which plays a dominant role in the lignin depolymerization process. Subsequently, the reaction can be carried out via three potential pathways, including (1) the dehydration of α-C-OH, (2) dehydration of γ-C-OH, and (3) the protonation of β-O. The electrophilic attack of H2SO4 and the hydrogen-bonding interaction between GG and zwitterion are the two most important factors to promote the depolymerization reaction. In all steps, the dehydration of α-C-OH route is computed to be favored for the experiment. The relatively higher energy barrier for β-O-4 bond dissociation among these reaction steps is attributed to the hindrance of the self-assembled clusters of GG in the mixed system. Further, the dense distribution of H13([C3SO3Hmim]) surrounding O21(GG), indicated by sharp peaks in RDFs, reveals that -SO3H in cations plays a substantial role in solvating lignin. Hopefully, this work will demonstrate new insights into lignin depolymerization by functionalized ILs in biomass conversion chemistry.
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Affiliation(s)
- Yaqin Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Feng Huo
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Yanlei Wang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Yu Xia
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Xin Tan
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Suojiang Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
| | - Hongyan He
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
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14
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Mechanistic insight into β‒O‒4 linkage cleavage of lignin model compound catalyzed by a SO3H-functionalized imidazolium ionic liquid: An unconventional E1 elimination. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2018.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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15
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Lindsay AC, Kudo S, Sperry J. Cleavage of lignin model compounds and ligninox using aqueous oxalic acid. Org Biomol Chem 2019; 17:7408-7415. [DOI: 10.1039/c9ob01452g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Aqueous oxalic acid cleaves oxidised β-O-4 lignin model compounds by two distinct mechanisms that are dependent on the presence of the hydroxymethyl substituent.
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Affiliation(s)
- Ashley C. Lindsay
- Centre for Green Chemical Science
- University of Auckland
- Auckland
- New Zealand
| | - Shinji Kudo
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Kasuga 816-8580
- Japan
| | - Jonathan Sperry
- Centre for Green Chemical Science
- University of Auckland
- Auckland
- New Zealand
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16
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Hou C, Li Y, Zhao C, Ke Z. A DFT study of Co(i) and Ni(ii) pincer complex-catalyzed hydrogenation of ketones: intriguing mechanism dichotomy by ligand field variation. Catal Sci Technol 2019. [DOI: 10.1039/c8cy01862f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Ligand field variation governs the mechanism dichotomy for isoelectronic catalysts.
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Affiliation(s)
- Cheng Hou
- School of Materials Science and Engineering
- PCFM Lab
- School of Chemistry
- Sun Yat-sen University
- Guangzhou
| | - Yinwu Li
- School of Materials Science and Engineering
- PCFM Lab
- School of Chemistry
- Sun Yat-sen University
- Guangzhou
| | - Cunyuan Zhao
- School of Materials Science and Engineering
- PCFM Lab
- School of Chemistry
- Sun Yat-sen University
- Guangzhou
| | - Zhuofeng Ke
- School of Materials Science and Engineering
- PCFM Lab
- School of Chemistry
- Sun Yat-sen University
- Guangzhou
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17
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Yan CX, Wu RZ, Lu K, Yang FL, Yang XS, Wang R, Yang X, Zhou PP, Shao X. Why electrostatically enhanced thiourea is better than Schreiner's thiourea in both catalytic activity and regioselectivity? Org Chem Front 2019. [DOI: 10.1039/c9qo00251k] [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
Electrostatically enhanced thiourea is more active and efficient than Schreiner's thiourea in the ring-opening aminolysis of styrene oxide with aniline, and the underlying reasons were explored by DFT calculations.
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Affiliation(s)
- Chao-Xian Yan
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Rui-Zhi Wu
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Ka Lu
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Fang-Ling Yang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Xiao-Shan Yang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Rui Wang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Xing Yang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Pan-Pan Zhou
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
| | - Xiangfeng Shao
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
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18
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Li W, Li C, Lyu Y. Lactamization of sp2 C–H bonds with CO2 under transition-metal-free and redox-neutral conditions: a computational mechanistic study. Org Chem Front 2018. [DOI: 10.1039/c8qo00394g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Bases play the primary role in Stages (I) and (III). CO2 serves as an atomic oxidant [O] acceptor in Stage (II).
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Affiliation(s)
- Weiyi Li
- School of Science
- Xihua University
- Chengdu, 610039
- P. R. China
| | - Caiqin Li
- School of Chemistry and Chemical Engineering
- Shanxi Datong University
- Datong
- China
| | - Yajing Lyu
- School of Science
- Xihua University
- Chengdu, 610039
- P. R. China
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19
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Lu Y, Gao ZH, Chen XY, Guo J, Liu Z, Dang Y, Ye S, Wang ZX. Formylation or methylation: what determines the chemoselectivity of the reaction of amine, CO 2, and hydrosilane catalyzed by 1,3,2-diazaphospholene? Chem Sci 2017; 8:7637-7650. [PMID: 29568428 PMCID: PMC5849201 DOI: 10.1039/c7sc00824d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 09/06/2017] [Indexed: 12/02/2022] Open
Abstract
DFT computations have been performed to gain insight into the mechanisms of formylation/methylation of amines (e.g. methylaniline (1a)/2,2,4,4-tetramethylpiperidine (2a)) with CO2 and hydrosilane ([Si]H2, [Si] = Ph2Si), catalyzed by 1,3,2-diazaphospholene ([NHP]H). Different from the generally proposed sequential mechanism for the methylation of amine with CO2, i.e. methylation proceeds via formylation, followed by further reduction of formamide to give an N-methylated amine, the study characterized a competition mechanism between formylation and methylation. The chemoselectivity originates from the competition between the amine and [NHP]H hydride to attack the formyloxy carbon of [Si](OCHO)2 (the insertion product of CO2 into [Si]H2). When the attack of an amine (e.g.1a) wins, the transformation affords formamide (1b) but would otherwise (e.g.2a) result in an N-methylated amine (2c). The reduction of formamide by [Si]H2 or [NHP]H is highly unfavorable kinetically, thus we call attention to the sequential mechanism for understanding the methylation of amine with CO2. In addition, the study has the following key mechanistic findings. The activation of CO2 by [NHP]H establishes an equilibrium: [NHP]H + CO2 ⇄ [NHP]OCHO ⇄ [NHP]+ + HCO2-. The ions play catalytic roles to promote formylation via HCO2- or methylation via[NHP]+ . In 1a formylation, HCO2- initiates the reaction, giving 1b and silanol byproducts. However, after the initiation, the silanol byproducts acting as hydrogen transfer shuttles are more effective than HCO2- to promote formylation. In 2a methylation, [NHP]+ promotes the generation of the key species, formaldehyde and a carbocation species (IM17+ ). Our experimental study corroborates our computed mechanisms.
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Affiliation(s)
- Yu Lu
- School of Chemistry and Chemical Engineering , University of the Chinese Academy of Sciences , Beijing 100049 , China .
| | - Zhong-Hua Gao
- Institute of Chemistry , Chinese Academy of Sciences , Beijing , 100190 , China .
| | - Xiang-Yu Chen
- Institute of Chemistry , Chinese Academy of Sciences , Beijing , 100190 , China .
| | - Jiandong Guo
- School of Chemistry and Chemical Engineering , University of the Chinese Academy of Sciences , Beijing 100049 , China .
| | - Zheyuan Liu
- School of Chemistry and Chemical Engineering , University of the Chinese Academy of Sciences , Beijing 100049 , China .
| | - Yanfeng Dang
- School of Chemistry and Chemical Engineering , University of the Chinese Academy of Sciences , Beijing 100049 , China .
| | - Song Ye
- Institute of Chemistry , Chinese Academy of Sciences , Beijing , 100190 , China .
| | - Zhi-Xiang Wang
- School of Chemistry and Chemical Engineering , University of the Chinese Academy of Sciences , Beijing 100049 , China .
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20
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Experimental and Kinetic Study on Lignin Depolymerization in Water/Formic Acid System. Int J Mol Sci 2017; 18:ijms18102082. [PMID: 28974020 PMCID: PMC5666764 DOI: 10.3390/ijms18102082] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 09/25/2017] [Accepted: 09/28/2017] [Indexed: 11/17/2022] Open
Abstract
Microwave-assisted depolymerization of black-liquor lignin in formic acid was studied, concentrating on the yield of liquid fractions as bio-oil 1 (mainly aromatic monomers) and bio-oil 2 (mainly aromatic oligomers) and the distribution of the specific compositions. Bio-oil 1 (9.69%) and bio-oil 2 (54.39%) achieved their maximum yields under 160 °C with the reaction time of 30 min. The chemical compositions of bio-oil 1 and bio-oil 2 were respectively identified by means of Gas Chromatography-Mass Spectrometer (GC-MS) and Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Ethanone, 1-(4-hydroxy-3-methoxyphenyl) and Ethanone, 1-(4-hydrox-3,5-dimethoxyphenyl) were evidenced to be the two prominent compounds in bio-oil 1. Production of aromatic oligomers with the molecular weight of 328, 342, 358, 378, 394, 424 and 454 identified by MALDI-TOF MS was substantially tuned with the reaction temperature. A two-separate-stage kinetic model was proposed to describe the acidic solvolysis of lignin assisted by microwave heating, where the first stage is dominated by the depolyerization of lignin to monomers and oligomers with the activation energy of 40.27 kJ·mol−1, and the second stage with the activation energy of 49.18 kJ·mol−1 is mainly ascribed to the repolymerization of first-stage produced compounds.
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21
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Oregui Bengoechea M, Miletíc N, Vogt MH, Arias PL, Barth T. Analysis of the effect of temperature and reaction time on yields, compositions and oil quality in catalytic and non-catalytic lignin solvolysis in a formic acid/water media using experimental design. BIORESOURCE TECHNOLOGY 2017; 234:86-98. [PMID: 28319777 DOI: 10.1016/j.biortech.2017.02.129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 02/24/2017] [Accepted: 02/25/2017] [Indexed: 06/06/2023]
Abstract
The catalytic solvolysis of Norway spruce (Picea abies L.) lignin in a formic acid/water media was explored at different temperatures and reaction times (283-397°C and 21-700min, respectively). Non-catalyzed experiments were compared with the effect of three different type of bifunctional catalysts (Pd/Al2O3, Rh/Al2O3 and Ru/Al2O3) and a solid Lewis acid (γ-Al2O3). We demonstrated that surface response methodology (RSM) and principal component analysis (PCA) were an adequate tool to: (i) evaluate the effect of the catalysts, temperature and reaction time in the oil yield, oil quality (H/C and O/C ratios, and Mw) and composition of the oil, (ii) establish the differences and/or similarities between the three bifunctional catalyst and (iii) to determine the role of the noble metal and the alumina support in the reaction system. In addition, the most active catalysts, Ru/Al2O3, and the optimum reaction conditions were determined (i.e. 340°C and 6h).
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Affiliation(s)
| | - Nemanja Miletíc
- Department of Chemical and Environmental Engineering, School of Engineering, University of the Basque Country (EHU/UPV), C/Alameda Urquijo s/n, 48013 Bilbao, Spain; Department of Food Technology, Faculty of Agronomy, University of Kragujevac, Cara Dušana 34, 32000 Čačak, Serbia
| | - Mari H Vogt
- Department of Chemistry, University of Bergen, Allegaten 41, N-5007 Bergen, Norway
| | - Pedro L Arias
- Department of Chemical and Environmental Engineering, School of Engineering, University of the Basque Country (EHU/UPV), C/Alameda Urquijo s/n, 48013 Bilbao, Spain
| | - Tanja Barth
- Department of Chemistry, University of Bergen, Allegaten 41, N-5007 Bergen, Norway
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22
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Wang W, Huang F, Sun C, Liu J, Sheng X, Chen D. A theoretical insight into the formation mechanisms of C/N-ribonucleosides with pyrimidine and ribose. Phys Chem Chem Phys 2017; 19:10413-10426. [PMID: 28379245 DOI: 10.1039/c6cp08068e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The detailed formation mechanisms of C-ribonucleoside and N-ribonucleoside via the reaction of 2,4,6-triaminopyrimidine (TAP) with (d)-ribose in aqueous solution were explored using density functional theory (DFT). The calculations indicate that five isomers (α,β-furanose, α,β-pyranose and open-chain aldehyde) of (d)-ribose can exist in equilibrium in aqueous solution. In contrast to cyclic isomers, an open-chain aldehyde is most feasible to react with TAP. In general, the formation pathways of C-nucleoside and N-nucleoside proceed in three steps including nucleophilic addition, dehydration and cyclization. The calculated apparent activation energies are 28.8 kcal mol-1 and 29.2 kcal mol-1, respectively. It suggests that both C- and N-nucleoside can be formed in aqueous solution, which is in good agreement with the experimental results. The water molecule plays an important "H-bridge" role by the hydrogen atom relay. Finally, a model structure of nucleobase, which will be beneficial for the C-C glycosidic bond formation, is proposed.
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Affiliation(s)
- Wenjuan Wang
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Jinan 250014, P. R. China.
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23
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Oregui-Bengoechea M, Gandarias I, Arias PL, Barth T. Unraveling the Role of Formic Acid and the Type of Solvent in the Catalytic Conversion of Lignin: A Holistic Approach. CHEMSUSCHEM 2017; 10:754-766. [PMID: 27925410 DOI: 10.1002/cssc.201601410] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 11/30/2016] [Indexed: 06/06/2023]
Abstract
The role of formic acid together with the effect of the solvent type and their synergic interactions with a NiMo catalyst were studied for the conversion of lignin into bio-oil in an alcohol/formic acid media. The replacement of formic acid with H2 or isopropanol decreased the oil yield to a considerable degree, increased the solid yield, and altered the nature of the bio-oil. The differences induced by the presence of H2 were comparable to those observed in the isopropanol system, which suggests similar lignin conversion mechanisms for both systems. Additional semi-batch experiments confirmed that formic acid does not act merely as an in situ hydrogen source or hydrogen donor molecule. Actually, is seems to react with lignin through a formylation-elimination-hydrogenolysis mechanism that leads to the depolymerization of the biopolymer. This reaction competes with formic acid decomposition, which gives mainly H2 and CO2 , and forms a complex reaction system. To the best of our knowledge, this is the first time that the distinctive role/mechanism of formic acid has been observed in the conversion of real lignin feedstock. In addition, the solvent, especially ethanol, seems also to play a vital role in the stabilization of the depolymerized monomers and in the elimination/deformylation step.
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Affiliation(s)
| | - Inaki Gandarias
- Chemical and Environmental Engineering Department, University of the Basque Country (UPV/EHU), Alameda Urquijo s/n, 48013, Bilbao, Spain
| | - Pedro L Arias
- Chemical and Environmental Engineering Department, University of the Basque Country (UPV/EHU), Alameda Urquijo s/n, 48013, Bilbao, Spain
| | - Tanja Barth
- Department of Chemistry, University of Bergen, Allegaten 41, N-5007, Bergen, Norway
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24
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Liu Q, Li P, Liu N, Shen D. Lignin depolymerization to aromatic monomers and oligomers in isopropanol assisted by microwave heating. Polym Degrad Stab 2017. [DOI: 10.1016/j.polymdegradstab.2016.11.016] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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25
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Duan Y, Liu Y, Bi S, Ling B, Jiang YY, Liu P. Theoretical Study of Gold-Catalyzed Cyclization of 2-Alkynyl-N-propargylanilines and Rationalization of Kinetic Experimental Phenomena. J Org Chem 2016; 81:9381-9388. [DOI: 10.1021/acs.joc.6b02092] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Yeqing Duan
- School of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Yuxia Liu
- School of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Siwei Bi
- School of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Baoping Ling
- School of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Yuan-Ye Jiang
- School of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Peng Liu
- School of Chemistry and Chemical
Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
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26
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Zhang Q, Fu MC, Yu HZ, Fu Y. Mechanism of Boron-Catalyzed N-Alkylation of Amines with Carboxylic Acids. J Org Chem 2016; 81:6235-43. [DOI: 10.1021/acs.joc.6b00778] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Qi Zhang
- Hefei
National Laboratory for Physical Sciences at the Microscale, iChEM,
CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key
Laboratory of Biomass Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Ming-Chen Fu
- Hefei
National Laboratory for Physical Sciences at the Microscale, iChEM,
CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key
Laboratory of Biomass Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Hai-Zhu Yu
- Department
of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, Hefei 230601, China
| | - Yao Fu
- Hefei
National Laboratory for Physical Sciences at the Microscale, iChEM,
CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key
Laboratory of Biomass Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China
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27
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Li J, Li J, Zhang D, Liu C. DFT Study on the Mechanism of Formic Acid Decomposition by a Well-Defined Bifunctional Cyclometalated Iridium(III) Catalyst: Self-Assisted Concerted Dehydrogenation via Long-Range Intermolecular Hydrogen Migration. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00564] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Jingjing Li
- Key
Lab of Colloid and Interface Chemistry, Ministry of Education, Institute
of Theoretical Chemistry, Shandong University, Jinan, 250100, People’s Republic of China
| | - Jinghua Li
- Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Dongju Zhang
- Key
Lab of Colloid and Interface Chemistry, Ministry of Education, Institute
of Theoretical Chemistry, Shandong University, Jinan, 250100, People’s Republic of China
| | - Chengbu Liu
- Key
Lab of Colloid and Interface Chemistry, Ministry of Education, Institute
of Theoretical Chemistry, Shandong University, Jinan, 250100, People’s Republic of China
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28
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Hou C, Zhang Z, Zhao C, Ke Z. DFT Study of Acceptorless Alcohol Dehydrogenation Mediated by Ruthenium Pincer Complexes: Ligand Tautomerization Governing Metal Ligand Cooperation. Inorg Chem 2016; 55:6539-51. [DOI: 10.1021/acs.inorgchem.6b00723] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Cheng Hou
- MOE Key Laboratory of Bioinorganic
and Synthetic Chemistry, School of Chemistry and Chemical Engineering,
School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Zhihan Zhang
- MOE Key Laboratory of Bioinorganic
and Synthetic Chemistry, School of Chemistry and Chemical Engineering,
School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Cunyuan Zhao
- MOE Key Laboratory of Bioinorganic
and Synthetic Chemistry, School of Chemistry and Chemical Engineering,
School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Zhuofeng Ke
- MOE Key Laboratory of Bioinorganic
and Synthetic Chemistry, School of Chemistry and Chemical Engineering,
School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
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29
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Renders T, Schutyser W, Van den Bosch S, Koelewijn SF, Vangeel T, Courtin CM, Sels BF. Influence of Acidic (H3PO4) and Alkaline (NaOH) Additives on the Catalytic Reductive Fractionation of Lignocellulose. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02906] [Citation(s) in RCA: 156] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tom Renders
- Center
for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan
200F, 3001 Leuven, Belgium
| | - Wouter Schutyser
- Center
for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan
200F, 3001 Leuven, Belgium
| | - Sander Van den Bosch
- Center
for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan
200F, 3001 Leuven, Belgium
| | - Steven-Friso Koelewijn
- Center
for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan
200F, 3001 Leuven, Belgium
| | - Thijs Vangeel
- Center
for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan
200F, 3001 Leuven, Belgium
| | - Christophe M. Courtin
- Center
for Food and Microbial Technology, KU Leuven, Kasteelpark Arenberg 22, 3001 Leuven, Belgium
| | - Bert F. Sels
- Center
for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan
200F, 3001 Leuven, Belgium
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