1
|
Tanaka R, Sogo K, Komaguchi K, Ae K, Nakayama Y, Shiono T. Impact of Methylaluminoxane Oxidation on Ethylene Polymerization Using Ni Catalysts. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ryo Tanaka
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kenji Sogo
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kenji Komaguchi
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kazuki Ae
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Yuushou Nakayama
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Takeshi Shiono
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| |
Collapse
|
2
|
Tran TV, Lee E, Nguyen YH, Nguyen HD, Do LH. Customizing Polymers by Controlling Cation Switching Dynamics in Non-Living Polymerization. J Am Chem Soc 2022; 144:17129-17139. [PMID: 36069706 DOI: 10.1021/jacs.2c07098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Controlling the chain growth process in non-living polymerization reactions is difficult because chain termination typically occurs faster than the time it takes to apply an external trigger. To overcome this limitation, we have developed a strategy to regulate non-living polymerizations by exploiting the chemical equilibria between a metal catalyst and secondary metal cations. We have prepared two nickel phenoxyphosphine-polyethylene glycol variants, one with 2-methoxyphenyl (Ni1) and another with 2,6-dimethoxyphenyl (Ni2) phosphine substituents. Ethylene polymerization studies using these complexes in the presence of alkali salts revealed that chain growth is strongly dependent on electronic effects, whereas chain termination is dependent on both steric and electronic effects. By adjusting the solvent polarity, we can favor polymerizations via non-switching or dynamic switching modes. For example, in a 100:0.2 mixture of toluene/diethyl ether, reactions of Ni1 and both Li+ and Na+ cations in the presence of ethylene yielded bimodal polymers with different relative fractions depending on the Li+/Na+ ratio used. In a 98:2 mixture of toluene/diethyl ether, reactions of Ni2 and Cs+ in the presence of ethylene generated monomodal polyethylene with dispersity <2.0 and increasing molecular weight as the amount of Cs+ added increased. Solution studies by NMR spectroscopy showed that cation exchange between the nickel complexes and alkali cations in 98:2 toluene/diethyl ether is fast on the NMR time scale, which supports our proposed dynamic switching mechanism.
Collapse
Affiliation(s)
- Thi V Tran
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Eryn Lee
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Yennie H Nguyen
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Hieu D Nguyen
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Loi H Do
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| |
Collapse
|
3
|
Soshnikov IE, Semikolenova NV, Bryliakov KP, Antonov AA, Talsi EP. Ni(I) Intermediates Formed upon Activation of a Ni(II) α-Diimine Ethylene Polymerization Precatalyst with AlR 3 (R = Me, Et, and iBu), AlR 2Cl (R = Me, Et), and MMAO: A Comparative Study. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00065] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Igor E. Soshnikov
- Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090, Novosibirsk, Russian Federation
| | - Nina V. Semikolenova
- Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090, Novosibirsk, Russian Federation
| | - Konstantin P. Bryliakov
- Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090, Novosibirsk, Russian Federation
| | - Artem A. Antonov
- Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090, Novosibirsk, Russian Federation
| | - Evgenii P. Talsi
- Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090, Novosibirsk, Russian Federation
| |
Collapse
|
4
|
Liu Y, Harth E. Distorted Sandwich α‐Diimine Pd
II
Catalyst: Linear Polyethylene and Synthesis of Ethylene/Acrylate Elastomers. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107039] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yu‐Sheng Liu
- Center of Excellence in Polymer Chemistry Department of Chemistry University of Houston 3585 Cullen Blvd Houston TX 77204 USA
| | - Eva Harth
- Center of Excellence in Polymer Chemistry Department of Chemistry University of Houston 3585 Cullen Blvd Houston TX 77204 USA
| |
Collapse
|
5
|
Harth E, Liu YS. Distorted Sandwich a-Diimine Pd(II) Catalyst: Linear Polyethylene and Synthesis of Ethylene/Acrylate Elastomers. Angew Chem Int Ed Engl 2021; 60:24107-24115. [PMID: 34403566 DOI: 10.1002/anie.202107039] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/29/2021] [Indexed: 11/09/2022]
Abstract
The introduction of m-xylyl substituents to α-diimine Pd(II) catalyst promotes living ethylene polymerization at room temperature and low pressure to yield high molecular weight polyethylene (PE) with low branching (<17/1000C). m-Xylyl groups provide a highly effective blockage to the axial sites of the catalytic center and form a distorted sandwich geometry. The shielding prevents chain-transfer and easy accessibility of polar monomers, leading to a living polymerization. Conducting a light irradiation as part of the one-step metal-organic insertion light initiated radical (MILRad) process leads to diblock copolymers of ethylene and acrylates. Incorporation of different acrylate block sequences can significantly modify the mechanical and chemical properties of block copolymers which can be modulated to be a hard plastic, elastomer, or semi-amorphous polymer.
Collapse
Affiliation(s)
- Eva Harth
- University of Houston, Chemistry, 406 STL Building, United States, 77004, Houston, UNITED STATES
| | - Yu-Sheng Liu
- University of Houston System, Chemistry, UNITED STATES
| |
Collapse
|
6
|
Hu X, Zhang Y, Li B, Jian Z. Fluorinated α-Diimine Nickel Mediated Ethylene (Co)Polymerization. Chemistry 2021; 27:11935-11942. [PMID: 34114692 DOI: 10.1002/chem.202101521] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Indexed: 11/10/2022]
Abstract
Fluorine substituents in transition metal catalysts are of great importance in olefin polymerization catalysis; however, the comprehensive effect of fluorine substituents is elusive in seminal late transition metal α-diimine catalytic system. In this contribution, fluorine substituents at various positions (ortho-, meta-, and para-F) and with different numbers (Fn ; n=0, 1, 2, 3, 5) were installed into the well-defined N-terphenyl amine and thus were studied for the first time in the nickel α-diimine promoted ethylene polymerization and copolymerization with polar monomers. The position of the fluorine substituent was particularly crucial in these polymerization reactions in terms of catalytic activity, polymer molecular weight, branching density, and incorporation of polar monomer, and thus a picture on the fluorine effect was given. As a notable result, the ortho-F substituted α-diimine nickel catalyst produced highly linear polyethylenes with an extremely high molecular weight (Mw =8703 kDa) and a significantly low degree of branching of 1.4/1000 C; however, the meta-F and/or para-F substituted α-diimine nickel catalysts generated highly branched (up to 80.2/1000 C) polyethylenes with significantly low molecular weights (Mw =20-50 kDa).
Collapse
Affiliation(s)
- Xiaoqiang Hu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun, 130022, China.,University of Science and Technology of China, Hefei, 230026, China
| | - Yixin Zhang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun, 130022, China
| | - Baixiang Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun, 130022, China
| | - Zhongbao Jian
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun, 130022, China.,University of Science and Technology of China, Hefei, 230026, China
| |
Collapse
|
7
|
Xing Y, Yu H, Wang L, Wang N, Zhu L, Liang R. The Formation of Polyethylene Using
α
‐Diiminonickel Precatalyst in the Presence of CoCp
2
and AgOTf. ChemistrySelect 2021. [DOI: 10.1002/slct.202101845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yusheng Xing
- State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering, Zhejiang University Hangzhou 310027 P.R. China
| | - Haojie Yu
- State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering, Zhejiang University Hangzhou 310027 P.R. China
| | - Li Wang
- State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering, Zhejiang University Hangzhou 310027 P.R. China
| | - Nan Wang
- State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering, Zhejiang University Hangzhou 310027 P.R. China
| | - Lei Zhu
- State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering, Zhejiang University Hangzhou 310027 P.R. China
| | - Ruixue Liang
- State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering, Zhejiang University Hangzhou 310027 P.R. China
| |
Collapse
|
8
|
Zhu L, Yu H, Wang L, Xing Y, Bilal Ul Amin. Advances in the Synthesis of Polyolefin Elastomers with “Chain-walking” Catalysts and Electron Spin Resonance Research of Related Catalytic Systems. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825666210126100641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In recent years, polyolefin elastomers play an increasingly important role in industry.
The late transition metal complex catalysts, especially α-diimine Ni(II) and α-diimine
Pd(II) complex catalysts, are popular “chain-walking” catalysts. They can prepare polyolefin
with various structures, ranging from linear configuration to highly branched configuration.
Combining the “chain-walking” characteristic with different polymerization strategies, polyolefins
with good elasticity can be obtained. Among them, olefin copolymer is a common
way to produce polyolefin elastomers. For instance, strictly defined diblock or triblock copolymers
with excellent elastic properties were synthesized by adding ethylene and α-olefin
in sequence. As well as the incorporation of polar monomers may lead to some unexpected
improvement. Chain shuttling polymerization can generate multiblock copolymers in one pot
due to the interaction of the catalysts with chain shuttling agent. Furthermore, when regarding ethylene as the sole
feedstock, owing to the “oscillation” of the ligands of the asymmetric catalysts, polymers with stereo-block structures
can be generated. Generally, the elasticity of these polyolefins mainly comes from the alternately crystallineamorphous
block structures, which is closely related to the characteristic of the catalytic system. To improve performance
of the catalysts and develop excellent polyolefin elastomers, research on the catalytic mechanism is of great
significance. Electron spin resonance (ESR), as a precise method to detect unpaired electron, can be applied to study
transition metal active center. Therefore, the progress on the exploration of the valence and the proposed configuration
of catalyst active center in the catalytic process by ESR is also reviewed.
Collapse
Affiliation(s)
- Lei Zhu
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Haojie Yu
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Li Wang
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yusheng Xing
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Bilal Ul Amin
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| |
Collapse
|
9
|
Xu S, Chen X, Luo G, Gao W. Nickel complexes based on BIAN ligands: transformation and catalysis on ethylene polymerization. Dalton Trans 2021; 50:7356-7363. [PMID: 33960360 DOI: 10.1039/d1dt00649e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of bis(arylimino)acenaphthene (ArBIAN) with Ni(COD)2 in toluene afforded dmpBIANNi(COD) (2a, dmp = 2,6-Me2C6H3) and dippBIANNi(COD) (2b, dipp = 2,6-iPrC6H3), respectively, in moderate yields. Complexes 2a and 2b can be oxidized by a small amount of oxygen at low temperature leading to oxygen-bridged dinuclear Ni(ii) complexes (dmpBIANNi)2(μ-O)2 (4a) and (dippBIANNi)2(μ-O)2 (4b), respectively, as a purple powder. The reaction of ArBIAN with 0.5 equiv of Ni(COD)2 or Ni(Ph3P)4 gave bisligated complexes (dmpBIAN)2Ni (3a) and (dippBIAN)2Ni (3b), which can be considered as Ni(0) complexes supported by two neutral BIAN ligands. Oxidation of the bisligated nickel complexes 3a and 3b with [Cp2Fe][B(C6F5)4] afforded cationic Ni(i) complexes [(dmpBIAN)2Ni][B(C6F5)4] (5a) and [(dippBIAN)2Ni][B(C6F5)4] (5b), respectively, in which the Ni(i) centre is chelated by two neutral Ar-BIAN ligands. These complexes were characterized by NMR and IR spectroscopy and DFT calculation, and the molecular structures of 3b, 4b, and 5b were well established by X-ray diffraction analysis. These complexes were evaluated as catalysts for ethylene polymerization in which 2b showed high activity in the presence of AlMe3. 13C NMR analysis of polymers showed that the 2b/AlMe3 catalytic system gave less-branched polymers when compared to that obtained with dippBIANNiBr2 under the same conditions.
Collapse
Affiliation(s)
- Shuyun Xu
- College of Chemistry, Jilin University, Changchun, China.
| | - Xuemeng Chen
- College of Chemistry, Jilin University, Changchun, China.
| | - Gen Luo
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
| | - Wei Gao
- College of Chemistry, Jilin University, Changchun, China.
| |
Collapse
|
10
|
|
11
|
Deng S, Diaconescu PL. A switchable dimeric yttrium complex and its three catalytic states in ring opening polymerization. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01479f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A dimeric yttrium phenoxide complex can be oxidized in a stepwise fashion to access three oxidation states. The three states show different activity in the ring opening polymerization of cyclic esters and epoxides.
Collapse
Affiliation(s)
- Shijie Deng
- University of California
- Los Angeles
- Department of Chemistry and Biochemistry
- Los Angeles
- USA
| | - Paula L. Diaconescu
- University of California
- Los Angeles
- Department of Chemistry and Biochemistry
- Los Angeles
- USA
| |
Collapse
|
12
|
Doerr AM, Burroughs JM, Gitter SR, Yang X, Boydston AJ, Long BK. Advances in Polymerizations Modulated by External Stimuli. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03802] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Alicia M. Doerr
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, United States
| | - Justin M. Burroughs
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, United States
| | - Sean R. Gitter
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Xuejin Yang
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Andrew J. Boydston
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Department of Chemical and Biological Engineering and Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Brian K. Long
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, United States
| |
Collapse
|
13
|
Yang XW, Li DH, Song AX, Liu FS. "Bulky-Yet-Flexible" α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air. J Org Chem 2020; 85:11750-11765. [PMID: 32808522 DOI: 10.1021/acs.joc.0c01509] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To pursue a highly regioselective and efficient reductive Heck reaction, a series of moisture- and air-stable α-diimine palladium precatalysts were rationally designed, readily synthesized, and fully characterized. The relationship between the structures of the palladium complexes and the catalytic properties was investigated. It was revealed that the"bulky-yet-flexible"palladium complexes allowed highly anti-Markovnikov-selective hydroarylation of alkenes with (hetero)aryl bromides under aerobic conditions. Further synthetic application of the present protocol could provide rapid and straightforward access to functional and biologically active molecules.
Collapse
Affiliation(s)
- Xu-Wen Yang
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Dong-Hui Li
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - A-Xiang Song
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Feng-Shou Liu
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| |
Collapse
|
14
|
Tran TV, Karas LJ, Wu JI, Do LH. Elucidating Secondary Metal Cation Effects on Nickel Olefin Polymerization Catalysts. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02949] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Thi V. Tran
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, Texas 77204, United States
| | - Lucas J. Karas
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, Texas 77204, United States
| | - Judy I. Wu
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, Texas 77204, United States
| | - Loi H. Do
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, Texas 77204, United States
| |
Collapse
|
15
|
Chapleski RC, Kern JL, Anderson WC, Long BK, Roy S. A mechanistic study of microstructure modulation in olefin polymerizations using a redox-active Ni(ii) α-diimine catalyst. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02538c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Density functional theory and experimental evidence provide insight into the mechanism of polyolefin microstructure modulation using redox-active Ni(ii) α-diimine catalysts.
Collapse
Affiliation(s)
| | | | | | - Brian K. Long
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
| | - Sharani Roy
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
| |
Collapse
|
16
|
Li M, Wang R, Eisen MS, Park S. Light-mediated olefin coordination polymerization and photoswitches. Org Chem Front 2020. [DOI: 10.1039/d0qo00426j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This review outlines photoswitchable, transition metal-based olefin coordination polymerization catalysts ranging from homogeneous to heterogeneous, and monometallic to bimetallic regimes.
Collapse
Affiliation(s)
- Mingyuan Li
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- Shantou 515063
- China
| | - Ruibin Wang
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- Shantou 515063
- China
| | - Moris S. Eisen
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- Shantou 515063
- China
- Schulich Faculty of Chemistry
| | - Sehoon Park
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- Shantou 515063
- China
- Technion-Israel Institute of Technology
| |
Collapse
|
17
|
Recent progress in preparation of branched polyethylene with nickel, titanium, vanadium and chromium catalytic systems and EPR study of related catalytic systems. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109339] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
18
|
|
19
|
Soshnikov IE, Bryliakov KP, Antonov AA, Sun WH, Talsi EP. Ethylene polymerization of nickel catalysts with α-diimine ligands: factors controlling the structure of active species and polymer properties. Dalton Trans 2019; 48:7974-7984. [PMID: 31070205 DOI: 10.1039/c9dt01297d] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
α-Diimine and related complexes of late transition metals such as palladium and nickel have been attracting continuing interest as single-site catalysts of ethylene homopolymerization to branched polyolefins, having challenging mechanical properties. The state-of-the art catalysts demonstrate promising catalytic activities, and enhanced thermal stabilities, affording polyethylenes with a variable degree of branching and, in addition, are able to incorporate polar co-monomers into polyethylene structures. At the same time, fundamental understanding of the structure-reactivity relationships of such catalysts mostly remains at the phenomenological level, due to the lack of experimental data on the solution structures of intermediates that drive the polymerization process. In this perspective, we discuss recent advances of α-diimine nickel based catalysts of ethylene polymerization, focusing on the relationships between the catalyst structures on the one hand, and their thermal stabilities and properties of the resulting polyethylene, on the other hand. In addition, some intriguing novel mechanistic findings of these catalyst systems are presented.
Collapse
Affiliation(s)
- Igor E Soshnikov
- Boreskov Institute of Catalysis, 630090, Novosibirsk, Pr. Lavrentieva, 5, Russian Federation. and Novosibirsk State University, 630090, Novosibirsk, Pirogova street, 2, Russian Federation
| | - Konstantin P Bryliakov
- Boreskov Institute of Catalysis, 630090, Novosibirsk, Pr. Lavrentieva, 5, Russian Federation. and Novosibirsk State University, 630090, Novosibirsk, Pirogova street, 2, Russian Federation
| | - Artem A Antonov
- Boreskov Institute of Catalysis, 630090, Novosibirsk, Pr. Lavrentieva, 5, Russian Federation. and Novosibirsk State University, 630090, Novosibirsk, Pirogova street, 2, Russian Federation
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China and CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Evgenii P Talsi
- Boreskov Institute of Catalysis, 630090, Novosibirsk, Pr. Lavrentieva, 5, Russian Federation. and Novosibirsk State University, 630090, Novosibirsk, Pirogova street, 2, Russian Federation
| |
Collapse
|
20
|
Anguo X, Shibiao Z, Fei L, Pan L, Hao L. Active site selectivity of 2,3-Bis[(2,6-diisopropylphenylimino)butane] nickel/MAO/ZnEt2 system toward ethylene polymerization for modulating polyethylene microstructure. CATAL COMMUN 2019. [DOI: 10.1016/j.catcom.2019.02.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
|
21
|
Saini A, Smith CR, Wekesa FS, Helms AK, Findlater M. Conversion of aldimines to secondary amines using iron-catalysed hydrosilylation. Org Biomol Chem 2019; 16:9368-9372. [PMID: 30516772 DOI: 10.1039/c8ob01262h] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron-catalyzed hydrosilylation of imines to amines using a well-defined iron complex is reported. This method employs relatively mild conditions, by reaction of imine, (EtO)3SiH in a 1 : 2 ratio in the presence of 1 mol% precatalyst ([BIAN]Fe(η6-toluene), 3, BIAN = bis(2,6-diisopropylaniline)acenaphthene) at 70 °C. A broad scope of imines was readily converted into the corresponding secondary amines without the need for precatalyst activators.
Collapse
Affiliation(s)
- Anu Saini
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA.
| | | | | | | | | |
Collapse
|
22
|
Zhang P, Zhao M, Pang W, Chen C. Lewis acid/base modulation in β-diiminate zinc-catalyzed switchable ring-opening polymerization of rac-lactide. Sci China Chem 2019. [DOI: 10.1007/s11426-018-9414-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
23
|
|
24
|
Mitchell NE, Long BK. Recent advances in thermally robust, late transition metal-catalyzed olefin polymerization. POLYM INT 2018. [DOI: 10.1002/pi.5694] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Nolan E Mitchell
- Department of Chemistry; University of Tennessee; Knoxville TN USA
| | - Brian K Long
- Department of Chemistry; University of Tennessee; Knoxville TN USA
| |
Collapse
|
25
|
Affiliation(s)
- Changle Chen
- CAS Key Laboratory of Soft Matter Chemistry, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People’s Republic of China
| |
Collapse
|
26
|
Guo L, Kong W, Xu Y, Yang Y, Ma R, Cong L, Dai S, Liu Z. Large-scale synthesis of novel sterically hindered acenaphthene-based α-diimine ligands and their application in coordination chemistry. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.01.055] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
27
|
Kaiser JM, Anderson WC, Long BK. Photochemical regulation of a redox-active olefin polymerization catalyst: controlling polyethylene microstructure with visible light. Polym Chem 2018. [DOI: 10.1039/c7py01836c] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The utility of photoredox chemistry is expanded to include microstructural control of polyolefins.
Collapse
Affiliation(s)
| | | | - Brian K. Long
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
| |
Collapse
|
28
|
Cai Z, Do LH. Customizing Polyolefin Morphology by Selective Pairing of Alkali Ions with Nickel Phenoxyimine-Polyethylene Glycol Catalysts. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00516] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhongzheng Cai
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| | - Loi H. Do
- Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States
| |
Collapse
|
29
|
|
30
|
Anderson WC, Park SH, Brown LA, Kaiser JM, Long BK. Accessing multiple polyethylene grades via a single redox-active olefin polymerization catalyst. Inorg Chem Front 2017. [DOI: 10.1039/c7qi00079k] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Access to more than one polyethylene grade is realized via utilization of a Ni-based olefin polymerization catalyst bearing a redox-active α-diimine ligand.
Collapse
Affiliation(s)
| | - Sang H. Park
- University of Tennessee
- Department of Chemistry
- Knoxville
- USA
| | | | | | - Brian K. Long
- University of Tennessee
- Department of Chemistry
- Knoxville
- USA
| |
Collapse
|
31
|
Wang X, Fan L, Ma Y, Guo CY, Solan GA, Sun Y, Sun WH. Elastomeric polyethylenes accessible via ethylene homo-polymerization using an unsymmetrical α-diimino-nickel catalyst. Polym Chem 2017. [DOI: 10.1039/c7py00434f] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Elastomeric polyethylenes, with good elastic recovery and high elongation at break, have been prepared using a new family of unsymmetrical α-diimino-nickel catalysts that display high activities and high thermal stability.
Collapse
Affiliation(s)
- Xinxin Wang
- School of Chemistry and Chemical Engineering and CAS Research/Education Center for Excellence in Molecular Sciences
- University of Chinese Academy of Sciences
- Beijing 100049
- China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
| | - Linlin Fan
- School of Chemistry and Chemical Engineering and CAS Research/Education Center for Excellence in Molecular Sciences
- University of Chinese Academy of Sciences
- Beijing 100049
- China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Cun-Yue Guo
- School of Chemistry and Chemical Engineering and CAS Research/Education Center for Excellence in Molecular Sciences
- University of Chinese Academy of Sciences
- Beijing 100049
- China
| | - Gregory A. Solan
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Yang Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| |
Collapse
|
32
|
Zou W, Pang W, Chen C. Redox control in palladium catalyzed norbornene and alkyne polymerization. Inorg Chem Front 2017. [DOI: 10.1039/c6qi00562d] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Switchable polymerization of norbornene, 5-norbornene-2-yl acetate and 1-chloro-1-octyne could be realized by using two palladium complexes (NHC)Pd(allyl)Cl (NHC = 1,3-Ar2-naphthoquinimidazolylidene, Ar = 2,6-Me2-C6H3, 2,6-iPr2-C6H3) bearing a redox-active naphthoquinone moiety.
Collapse
Affiliation(s)
- Wenping Zou
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Wenmin Pang
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| | - Changle Chen
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
| |
Collapse
|