51
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Chai H, Liu T, Zheng D, Yu Z. Cooperative N–H and CH2 Skeleton Effects on the Catalytic Activities of Bimetallic Ru(II)–NNN Complexes: Experimental and Theoretical Study. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00682] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Huining Chai
- Dalian Institute
of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Tingting Liu
- Dalian Institute
of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Daoyuan Zheng
- Dalian Institute
of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Zhengkun Yu
- Dalian Institute
of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People’s Republic of China
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, People’s Republic of China
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52
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Zhang H, Hu S, Zhao J, Zhang G. Expanding the scope of organocatalysis for alternating copolymerization of dihydrocoumarin and styrene oxide. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.06.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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53
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Childers MI, Vitek AK, Morris LS, Widger PCB, Ahmed SM, Zimmerman PM, Coates GW. Isospecific, Chain Shuttling Polymerization of Propylene Oxide Using a Bimetallic Chromium Catalyst: A New Route to Semicrystalline Polyols. J Am Chem Soc 2017; 139:11048-11054. [PMID: 28671825 DOI: 10.1021/jacs.7b00194] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydroxy-telechelic poly(propylene oxide) (PPO) is widely used industrially as a midsegment in polyurethane synthesis. These atactic polymers are produced from racemic propylene oxide using chain shuttling agents and double-metal cyanide catalysts. Unlike atactic PPO, isotactic PPO is semicrystalline with a melting temperature of approximately 67 °C. Currently there is no practical route to hydroxy-telechelic isotactic PPO using racemic propylene oxide as the monomer. In this paper, hydroxy-telechelic isotactic PPO is synthesized from racemic propylene oxide with control of molecular weight using enantioselective and isoselective bimetallic catalysts in conjunction with chain shuttling agents. The discovery of an easily accessible bimetallic chromium catalyst is reported for this transformation. Diol, triol, and polymeric chain shuttling agents are used to give hydroxy-telechelic isotactic PPO of varying functionality and structure. Detailed quantum chemical studies are used to reveal the polymerization mechanism and origin of stereoselectivity.
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Affiliation(s)
- M Ian Childers
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - Andrew K Vitek
- Department of Chemistry, University of Michigan , Ann Arbor, Michigan 48109-1055, United States
| | - Lilliana S Morris
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - Peter C B Widger
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - Syud M Ahmed
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - Paul M Zimmerman
- Department of Chemistry, University of Michigan , Ann Arbor, Michigan 48109-1055, United States
| | - Geoffrey W Coates
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
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54
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Synthesis and Properties of Salicylaldehydes Fine-Tuned by Modular Assembly using “Plug-and-Socket”-Type Extendibility. Chemistry 2017; 23:8286-8294. [DOI: 10.1002/chem.201701141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Indexed: 11/07/2022]
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55
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Hiranoi Y, Hatanaka M, Nakano K. Multinuclear cobalt-salen complexes with phenylene linker for epoxide polymerizations. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28590] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yo Hiranoi
- Department of Organic and Polymer Materials Chemistry; Tokyo University of Agriculture and Technology; Koganei Tokyo 184-8588 Japan
| | - Miho Hatanaka
- Department of Chemistry; Faculty of Science and Engineering, Kindai University; Higashiosaka Osaka 577-8502 Japan
| | - Koji Nakano
- Department of Organic and Polymer Materials Chemistry; Tokyo University of Agriculture and Technology; Koganei Tokyo 184-8588 Japan
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56
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Yue X, Qi X, Bai R, Lei A, Lan Y. Mononuclear or Dinuclear? Mechanistic Study of the Zinc-Catalyzed Oxidative Coupling of Aldehydes and Acetylenes. Chemistry 2017; 23:6419-6425. [DOI: 10.1002/chem.201700733] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Xiaoyu Yue
- School of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400030 P. R. China
| | - Xiaotian Qi
- School of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400030 P. R. China
- College of Chemistry and Molecular Sciences; Wuhan University, Wuhan; 430072 Hubei P. R. China
| | - Ruopeng Bai
- School of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400030 P. R. China
| | - Aiwen Lei
- College of Chemistry and Molecular Sciences; Wuhan University, Wuhan; 430072 Hubei P. R. China
| | - Yu Lan
- School of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400030 P. R. China
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57
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Ghosh S, Lund H, Jiao H, Mejía E. Rediscovering the Isospecific Ring-Opening Polymerization of Racemic Propylene Oxide with Dibutylmagnesium. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b01830] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Swarup Ghosh
- Leibniz Institute for Catalysis, University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
| | - Henrik Lund
- Leibniz Institute for Catalysis, University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
| | - Haijun Jiao
- Leibniz Institute for Catalysis, University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
| | - Esteban Mejía
- Leibniz Institute for Catalysis, University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
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58
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Group 4 complexes of salicylbenzoxazole ligands as effective catalysts for the ring-opening polymerization of lactides, epoxides and copolymerization of ε-caprolactone with L-lactide. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.08.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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59
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Houjou H, Yagi K, Yoshikawa I, Mutai T, Araki K. Effects of interaction between the chelate rings and π-conjugated systems in fused salphen complexes on UV-Vis-NIR spectra. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Hirohiko Houjou
- Institute of Industrial Science; The University of Tokyo; 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan
| | - Keisuke Yagi
- Institute of Industrial Science; The University of Tokyo; 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan
| | - Isao Yoshikawa
- Institute of Industrial Science; The University of Tokyo; 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan
| | - Toshiki Mutai
- Institute of Industrial Science; The University of Tokyo; 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan
| | - Koji Araki
- Institute of Industrial Science; The University of Tokyo; 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan
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60
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A pair of nonporous homochiral cobalt-based coordination polymers for enantioselective recognition and electrocatalysis. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.04.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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61
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Clark RW, Akhani RK, Wiskur SL. Polymers and Kinetic Resolutions: The Insolubility of It All. ChemCatChem 2016. [DOI: 10.1002/cctc.201500887] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Robert W. Clark
- Department of Chemistry and Biochemistry; University of South Carolina; 631 Sumter St. Columbia SC 29208 USA
| | - Ravish K. Akhani
- Department of Chemistry and Biochemistry; University of South Carolina; 631 Sumter St. Columbia SC 29208 USA
| | - Sheryl L. Wiskur
- Department of Chemistry and Biochemistry; University of South Carolina; 631 Sumter St. Columbia SC 29208 USA
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62
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Sun Z, Duan R, Yang J, Zhang H, Li S, Pang X, Chen W, Chen X. Bimetallic Schiff base complexes for stereoselective polymerisation of racemic-lactide and copolymerisation of racemic-lactide with ε-caprolactone. RSC Adv 2016. [DOI: 10.1039/c6ra00289g] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bimetallic Schiff-base complexes with different bridging parts and silyl-substituents were applied for stereoselective ROP ofrac-LA, and copolymerisation ofrac-LA/ε-CL.
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Affiliation(s)
- Zhiqiang Sun
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Ranlong Duan
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Jingwei Yang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Han Zhang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Shuai Li
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Wenqi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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63
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Mandal D, Chakraborty D, Ramkumar V, Chand DK. Group 4 alkoxide complexes containing [NNO]-type scaffold: synthesis, structural characterization and polymerization studies. RSC Adv 2016. [DOI: 10.1039/c5ra26721h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of new dinuclear group 4 complexes containing [NNO]-type ligands are utilized as catalysts for polymerization reactions.
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Affiliation(s)
- Dipa Mandal
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600 036
- India
| | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600 036
- India
| | | | - Dillip Kumar Chand
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600 036
- India
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64
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Thevenon A, Garden JA, White AJP, Williams CK. Dinuclear Zinc Salen Catalysts for the Ring Opening Copolymerization of Epoxides and Carbon Dioxide or Anhydrides. Inorg Chem 2015; 54:11906-15. [DOI: 10.1021/acs.inorgchem.5b02233] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arnaud Thevenon
- Department of Chemistry, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Jennifer A. Garden
- Department of Chemistry, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, London, SW7 2AZ, United Kingdom
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65
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Liu Y, Ren WM, Zhang WP, Zhao RR, Lu XB. Crystalline CO2-based polycarbonates prepared from racemic catalyst through intramolecularly interlocked assembly. Nat Commun 2015; 6:8594. [PMID: 26469884 PMCID: PMC4634215 DOI: 10.1038/ncomms9594] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 09/04/2015] [Indexed: 11/09/2022] Open
Abstract
The crystalline stereocomplexed polycarbonates can be prepared by mixing enantiopure polymers with opposite configuration, which derived from the asymmetric copolymerization with CO2 using enantiopure catalyst or/and chiral epoxides. Herein, we develop a powerful strategy for producing crystalline intramolecular stereocomplexed polycarbonates from racemic catalysts, which possess similar thermal stability and crystalline behaviour in comparison with the stereocomplexes by mixing opposite enantiopure polymers. Living polymer chains shuttle between catalyst molecules with different configurations to produce diastereomeric active species which is suggested to be responsible for the formation of isotactic multiblock polycarbonates in racemic bimetallic cobalt catalyst-mediated stereoselective copolymerization of CO2 and meso-epoxides. Solid-state NMR spectroscopy study suggests that the interaction in the carbonyl and methine regions is responsible for the strong crystallization capacity and compact package structure in the crystalline polycarbonates. Crystalline polycarbonates can be formed by mixing enantiopure polymers with opposite configurations. Here, the authors produce crystalline intramolecular stereocomplexed polycarbonates using a racemic catalyst, and show that these display similar properties to those formed by mixing the two enantiomers.
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Affiliation(s)
- Ye Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Wei-Min Ren
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Wei-Ping Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Rong-Rong Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Xiao-Bing Lu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
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66
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Effect of the phenyl ring substituent on stereoselectivity in the ring-opening polymerization of the rac-lactide initiated by salen aluminum complexes. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3720-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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67
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Zhao Y, Yu M, Zhang S, Wu Z, Liu Y, Peng CH, Fu X. A well-defined, versatile photoinitiator (salen)Co-CO 2CH 3 for visible light-initiated living/controlled radical polymerization. Chem Sci 2015; 6:2979-2988. [PMID: 29308172 PMCID: PMC5656039 DOI: 10.1039/c5sc00477b] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 03/05/2015] [Indexed: 12/27/2022] Open
Abstract
The control of the polymerization of a wide range of monomers under mild conditions by a single catalyst remains a major challenge in polymer science. We report a versatile, well-defined organocobalt salen complex to control living radical polymerization of different categories of monomers, including acrylates, acrylamides and vinyl acetate, under visible light irradiation at ambient temperature. Both household light and sunlight were effectively applied in the synthesis of polymers with controlled molecular weights and narrow polydispersities. Narrowly dispersed block copolymers (Mw/Mn < 1.2) were obtained under various conditions. The structures of the polymers were analyzed by 1H NMR, 2D NMR, 13C NMR, GPC, MALDI-TOF-MS and isotopic labeling experiments, which showed that the ω and α ends of the polymer chains were capped with (salen)Co and -CO2CH3 segments, respectively, from the photoinitiator (salen)Co-CO2CH3. The ω end was easily functionalized through oxygen insertion followed by hydrolysis from 18O2 to -18OH. This robust system can proceed without any additives, and offers a versatile and green way to produce well-defined homo and block copolymers.
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Affiliation(s)
- Yaguang Zhao
- Beijing National Laboratory for Molecular Sciences , State Key Lab of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China .
| | - Mengmeng Yu
- Beijing National Laboratory for Molecular Sciences , State Key Lab of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China .
| | - Shuailin Zhang
- Beijing National Laboratory for Molecular Sciences , State Key Lab of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China .
| | - Zhenqiang Wu
- Beijing National Laboratory for Molecular Sciences , State Key Lab of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China .
| | - Yuchu Liu
- Beijing National Laboratory for Molecular Sciences , State Key Lab of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China .
| | - Chi-How Peng
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters , National Tsing-Hua University , Hsinchu , 30013 , Taiwan
| | - Xuefeng Fu
- Beijing National Laboratory for Molecular Sciences , State Key Lab of Rare Earth Materials Chemistry and Applications , College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China .
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68
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Liu Y, Wang M, Ren WM, Xu YC, Lu XB. Crystalline Hetero-Stereocomplexed Polycarbonates Produced from Amorphous Opposite Enantiomers Having Different Chemical Structures. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501417] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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69
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Liu Y, Wang M, Ren WM, Xu YC, Lu XB. Crystalline Hetero-Stereocomplexed Polycarbonates Produced from Amorphous Opposite Enantiomers Having Different Chemical Structures. Angew Chem Int Ed Engl 2015; 54:7042-6. [DOI: 10.1002/anie.201501417] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 03/11/2015] [Indexed: 01/05/2023]
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70
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Akhani RK, Clark RW, Yuan L, Wang L, Tang C, Wiskur SL. Polystyrene-Supported Triphenylsilyl Chloride for the Silylation-Based Kinetic Resolution of Secondary Alcohols. ChemCatChem 2015. [DOI: 10.1002/cctc.201500173] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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71
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Jia WG, Li DD, Gu C, Dai YC, Zhou YH, Yuan G, Sheng EH. Two cadmium(II) complexes with oxazoline-based ligands as effective catalysts for C–N cross-coupling reactions. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.01.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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72
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Jin J, Gong Y, Li L, Han X, Meng Q, Liu Y, Niu S. Spectroscopic properties of a series of Co(II) coordination polymers and the influence of Co(II) coordination environment on photoelectric property. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:856-863. [PMID: 25280332 DOI: 10.1016/j.saa.2014.08.055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 08/07/2014] [Accepted: 08/23/2014] [Indexed: 06/03/2023]
Abstract
Four Co(II) coordination polymers, [Co(suc)]n 1, [Co(pdc)]n 2, {[Co7(suc)4(OH)6(H2O)3]·8H2O}n 3, {[Co(bdc)(phen)(H2O)]·H2O}n 4 (H2suc=succinic acid, H2pdc=pyridine-3,4-dicarboxylic acid, H2bdc=1,2-benzenedicarboxylic acid, phen=1,10-phenanthroline) were hydrothermally synthesized and characterized by X-ray single-crystal diffraction, surface photovoltage spectroscopy (SPS), electrical conductivity, thermogravimetric analysis (TG), ultraviolet visible and near-infrared absorption spectrum (UV-Vis-NIR), infrared spectrum (IR), and elemental analysis. The structural analyses indicate that the coordination numbers of the Co(II) ions are 4, 5, 6 and 6 for the polymers 1-4, respectively. And polymers 1 and 2 exhibit 3D structure formed by suc(2-) and pdc(2-) anions bridging Co(II) ions, respectively. Polymer 3 exhibits a 2D structure with suc(2-) anions bridging seven-nuclear [Co7(OH)6(H2O)3](3-) unit and polymer 4 is a 1D structure bridged by bdc(2-) anions. The surface photoelectric properties of the cobalt polymers were mainly studied by SPS. The results of SPS reveal that all polymers possess certain photoelectric conversion property in the range of 300-800 nm. The influences of the structure, coordination micro-environment of central metal ion and structural dimensionality on response bands of SPS were discussed.
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Affiliation(s)
- Jing Jin
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
| | - Yuanyuan Gong
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
| | - Lei Li
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
| | - Xiao Han
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
| | - Qin Meng
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
| | - Yonghua Liu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China
| | - Shuyun Niu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
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73
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Houjou H, Yagi K, Yoshikawa I, Mutai T, Araki K. Solid-State Characterization of a Fused Salphen–Nickel Metallopolymer Prepared via Transmetalation in a Heterogeneous Reaction System. J Inorg Organomet Polym Mater 2015. [DOI: 10.1007/s10904-015-0187-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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74
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75
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Gao B, Li D, Li X, Duan R, Pang X, Cui Y, Duan Q, Chen X. Preparation of biocompatible, biodegradable and sustainable polylactides catalyzed by aluminum complexes bearing unsymmetrical dinaphthalene-imine derivatives via ring-opening polymerization of lactides. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00982k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aluminum complexes bearing unsymmetrical dinaphthalene-imine ligands were employed for lactide polymerization.
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Affiliation(s)
- Bo Gao
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Dongni Li
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Xiang Li
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Ranlong Duan
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Yuan Cui
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Qian Duan
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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76
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Basu D, Allard MM, Xavier FR, Heeg MJ, Schlegel HB, Verani CN. Modulation of electronic and redox properties in phenolate-rich cobalt(iii) complexes and their implications for catalytic proton reduction. Dalton Trans 2015; 44:3454-66. [DOI: 10.1039/c4dt03337j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The redox, spectroscopic and catalytic activity of a series of cobalt complexes with phenolate-rich environments was investigated. The complex [CoIII(LCl)MeOH] shows considerable proton reduction in MeCN:HOAc with TON = 10.8.
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Affiliation(s)
- Debashis Basu
- Department of Chemistry
- Wayne State University
- Detroit
- USA
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77
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Gao B, Zhao D, Li X, Cui Y, Duan R, Pang X. Magnesium complexes bearing N,N-bidentate phenanthrene derivatives for the stereoselective ring-opening polymerization of rac-lactides. RSC Adv 2015. [DOI: 10.1039/c4ra12548g] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Magnesium complexes based on N,N-bidentate phenanthrene derivatives derived from Schiff bases were synthesized and investigated as catalysts for rac-lactide polymerization.
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Affiliation(s)
- Bo Gao
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
- Key Laboratory of Polymer Ecomaterials
| | - Dehai Zhao
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
- Key Laboratory of Polymer Ecomaterials
| | - Xiang Li
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Yuan Cui
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
- Key Laboratory of Polymer Ecomaterials
| | - Ranlong Duan
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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78
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Mandal M, Chakraborty D, Ramkumar V. Zr(iv) complexes containing salan-type ligands: synthesis, structural characterization and role as catalysts towards the polymerization of ε-caprolactone, rac-lactide, ethylene, homopolymerization and copolymerization of epoxides with CO2. RSC Adv 2015. [DOI: 10.1039/c4ra17201a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Three new Zr(iv) complexes bearing salan-type diamine bis(phenolato) ligands were synthesized and their activities towards the ROP of ε-CL, rac-LA and homopolymerization, copolymerization and coupling of epoxides with CO2 were investigated.
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Affiliation(s)
- Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna-800 013
- India
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79
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Paul S, Zhu Y, Romain C, Brooks R, Saini PK, Williams CK. Ring-opening copolymerization (ROCOP): synthesis and properties of polyesters and polycarbonates. Chem Commun (Camb) 2015; 51:6459-79. [DOI: 10.1039/c4cc10113h] [Citation(s) in RCA: 392] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This feature article highlights the opportunities presented by ring-opening copolymerization (ROCOP) as a controlled route to prepare polyesters and polycarbonates.
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Affiliation(s)
- Shyeni Paul
- Dept. Chemistry
- Imperial College London
- London SW7 2AZ
- UK
| | - Yunqing Zhu
- Dept. Chemistry
- Imperial College London
- London SW7 2AZ
- UK
| | | | - Rachel Brooks
- Dept. Chemistry
- Imperial College London
- London SW7 2AZ
- UK
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80
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Chiral Bimetallic Lewis Acids. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/3418_2015_153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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81
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Auriemma F, De Rosa C, Di Caprio MR, Di Girolamo R, Ellis WC, Coates GW. Stereocomplexed Poly(Limonene Carbonate): A Unique Example of the Cocrystallization of Amorphous Enantiomeric Polymers. Angew Chem Int Ed Engl 2014; 54:1215-8. [DOI: 10.1002/anie.201410211] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 11/06/2014] [Indexed: 12/28/2022]
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82
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Auriemma F, De Rosa C, Di Caprio MR, Di Girolamo R, Ellis WC, Coates GW. Stereocomplexed Poly(Limonene Carbonate): A Unique Example of the Cocrystallization of Amorphous Enantiomeric Polymers. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201410211] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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83
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Liu Y, Ren WM, Liu C, Fu S, Wang M, He KK, Li RR, Zhang R, Lu XB. Mechanistic Understanding of Dinuclear Cobalt(III) Complex Mediated Highly Enantioselective Copolymerization of meso-Epoxides with CO2. Macromolecules 2014. [DOI: 10.1021/ma5019186] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ye Liu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Wei-Min Ren
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Chuang Liu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Song Fu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Meng Wang
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Ke-Ke He
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Rong-Rong Li
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Rong Zhang
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Xiao-Bing Lu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, Dalian 116024, China
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84
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Longo JM, DiCiccio AM, Coates GW. Poly(propylene succinate): A New Polymer Stereocomplex. J Am Chem Soc 2014; 136:15897-900. [DOI: 10.1021/ja509440g] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Julie M. Longo
- Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - Angela M. DiCiccio
- Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - Geoffrey W. Coates
- Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
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85
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Ouyang GH, He YM, Fan QH. Podand-Based Dimeric Chromium(III)-Salen Complex for Asymmetric Henry Reaction: Cooperative Catalysis Promoted by Complexation of Alkali Metal Ions. Chemistry 2014; 20:16454-7. [DOI: 10.1002/chem.201404605] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Indexed: 11/06/2022]
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86
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Chiang L, Allan LEN, Alcantara J, Wang MCP, Storr T, Shaver MP. Tuning ligand electronics and peripheral substitution on cobalt salen complexes: structure and polymerisation activity. Dalton Trans 2014; 43:4295-304. [PMID: 24048446 DOI: 10.1039/c3dt51846a] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A series of cobalt salen complexes, where salen represents an N2O2 bis-Schiff-base bis-phenolate framework, are prepared, characterised and investigated for reversible-termination organometallic mediated radical polymerisation (RT-OMRP). The salen ligands contain a cyclohexane diimine bridge and systematically altered para-substituted phenoxide moieties as a method to examine the electronic impact of the ligand on complex structure and reactivity. The complexes are characterised by single crystal X-ray diffraction, cyclic voltammetry, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy and computational methods. Structural studies all support a tailorable metal centre reactivity altered by the electron-donating ability of the salen ligand. RT-OMRP of styrene, methyl methacrylate and vinyl acetate is reported and suggests that cobalt-carbon bond strength varies with the ligand substitution. Competing β-hydrogen abstraction affords long-chain olefin-terminated polymer chains and well controlled vinyl acetate polymerisations, contrasting with the lower temperature associative exchange mechanism of degenerative transfer OMRP.
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Affiliation(s)
- Linus Chiang
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
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87
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Childers MI, Longo JM, Van Zee NJ, LaPointe AM, Coates GW. Stereoselective epoxide polymerization and copolymerization. Chem Rev 2014; 114:8129-52. [PMID: 25007101 DOI: 10.1021/cr400725x] [Citation(s) in RCA: 304] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- M Ian Childers
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
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88
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White DE, Tadross PM, Lu Z, Jacobsen EN. A broadly applicable and practical oligomeric (salen) Co catalyst for enantioselective epoxide ring-opening reactions. Tetrahedron 2014; 70:4165-4180. [PMID: 25045188 PMCID: PMC4096935 DOI: 10.1016/j.tet.2014.03.043] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The (salen) Co catalyst (4a) can be prepared as a mixture of cyclic oligomers in a short, chromatography-free synthesis from inexpensive, commercially available precursors. This catalyst displays remarkable enhancements in reactivity and enantioselectivity relative to monomeric and other multimeric (salen) Co catalysts in a wide variety of enantioselective epoxide ring-opening reactions. The application of catalyst 4a is illustrated in the kinetic resolution of terminal epoxides by nucleophilic ring-opening with water, phenols, and primary alcohols; the desymmetrization of meso epoxides by addition of water and carbamates; and the desymmetrization of oxetanes by intramolecular ring opening with alcohols and phenols. The favorable solubility properties of complex 4a under the catalytic conditions facilitated mechanistic studies, allowing elucidation of the basis for the beneficial effect of oligomerization. Finally, a catalyst selection guide is provided to delineate the specific advantages of oligomeric catalyst 4a relative to (salen) Co monomer 1 for each reaction class.
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Affiliation(s)
- David E White
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Pamela M Tadross
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Zhe Lu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Eric N Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
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89
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Manganese-Corrole Complexes as Versatile Catalysts for the Ring-Opening Homo- and Co-Polymerization of Epoxide. Chemistry 2014; 20:4789-95. [DOI: 10.1002/chem.201303703] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 12/19/2013] [Indexed: 11/07/2022]
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90
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Daeffler CS, Miyake GM, Li J, Grubbs RH. Partial Kinetic Resolution of Oxanorbornenes by Ring-Opening Metathesis Polymerization with a Chiral Ruthenium Initiator. ACS Macro Lett 2014; 3:102-104. [PMID: 35651118 DOI: 10.1021/mz4005953] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We report the first kinetic resolution by ring-opening metathesis polymerization (KR-ROMP). The polymerization profile showed a solvent-dependent variation of selectivity (S) over the course of the reaction. In tetrahydrofuran and dichloromethane, the resolution selectivity increased over the course of the reaction, while in toluene the selectivity was much higher in the beginning of the reaction and decreased throughout. Evidence suggests that the change in selectivity might be attributed to the chiral secondary structure of the growing polymer chain.
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Affiliation(s)
- Christopher S. Daeffler
- Arnold and Mabel Beckman
Laboratory of Chemical Synthesis, Division of Chemistry and Chemical
Engineering, California Institute of Technology, MC 164-30, Pasadena, California 91125, United States
| | - Garret M. Miyake
- Arnold and Mabel Beckman
Laboratory of Chemical Synthesis, Division of Chemistry and Chemical
Engineering, California Institute of Technology, MC 164-30, Pasadena, California 91125, United States
| | - Jean Li
- Arnold and Mabel Beckman
Laboratory of Chemical Synthesis, Division of Chemistry and Chemical
Engineering, California Institute of Technology, MC 164-30, Pasadena, California 91125, United States
| | - Robert H. Grubbs
- Arnold and Mabel Beckman
Laboratory of Chemical Synthesis, Division of Chemistry and Chemical
Engineering, California Institute of Technology, MC 164-30, Pasadena, California 91125, United States
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91
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Affiliation(s)
- Hélène Pellissier
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313 13397, Marseille, France
| | - Hervé Clavier
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313 13397, Marseille, France
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92
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Darensbourg DJ, Yeung AD. A concise review of computational studies of the carbon dioxide–epoxide copolymerization reactions. Polym Chem 2014. [DOI: 10.1039/c4py00299g] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The production of polycarbonates from carbon dioxide and epoxides is an important route by which waste CO2 is converted into useful products. This review surveys the use of computational chemistry toward understanding this reaction.
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93
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Wu B, Gallucci JC, Parquette JR, RajanBabu TV. Bimetallic catalysis in the highly enantioselective ring–opening reactions of aziridines. Chem Sci 2014. [DOI: 10.1039/c3sc52929k] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Structural and kinetic evidence for bimetallic mechanism.
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Affiliation(s)
- Bin Wu
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus, USA
| | - Judith C. Gallucci
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus, USA
| | - Jon R. Parquette
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus, USA
| | - T. V. RajanBabu
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus, USA
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94
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Babu HV, Muralidharan K. Polyethers with phosphate pendant groups by monomer activated anionic ring opening polymerization: Syntheses, characterization and their lithium-ion conductivities. POLYMER 2014. [DOI: 10.1016/j.polymer.2013.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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95
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Matsunaga S, Shibasaki M. Recent advances in cooperative bimetallic asymmetric catalysis: dinuclear Schiff base complexes. Chem Commun (Camb) 2014; 50:1044-57. [DOI: 10.1039/c3cc47587e] [Citation(s) in RCA: 207] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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96
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Arai T, Sugiyama N, Masu H, Kado S, Yabe S, Yamanaka M. A trinuclear Zn3(OAc)4-3,3′-bis(aminoimino)binaphthoxide complex for highly efficient catalytic asymmetric iodolactonization. Chem Commun (Camb) 2014; 50:8287-90. [DOI: 10.1039/c4cc02415j] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Using a harmony of the tri-zinc atoms, 1 mol% Zn3(OAc)4-3,3′-bis(aminoimino)binaphthoxide catalyzed asymmetric iodolactonization in up to 99.9% ee.
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Affiliation(s)
- Takayoshi Arai
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba, Japan
| | - Noriyuki Sugiyama
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba, Japan
| | - Hyuma Masu
- Center for Analytical Instrumentation
- Chiba University
- Chiba, Japan
| | - Sayaka Kado
- Center for Analytical Instrumentation
- Chiba University
- Chiba, Japan
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97
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Ahmed SM, Poater A, Childers MI, Widger PCB, LaPointe AM, Lobkovsky EB, Coates GW, Cavallo L. Enantioselective polymerization of epoxides using biaryl-linked bimetallic cobalt catalysts: a mechanistic study. J Am Chem Soc 2013; 135:18901-11. [PMID: 24199614 DOI: 10.1021/ja409521z] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The enantioselective polymerization of propylene oxide (PO) using biaryl-linked bimetallic salen Co catalysts was investigated experimentally and theoretically. Five key aspects of this catalytic system were examined: (1) the structural features of the catalyst, (2) the regio- and stereoselectivity of the chain-growth step, (3) the probable oxidation and electronic state of Co during the polymerization, (4) the role of the cocatalyst, and (5) the mechanism of monomer enchainment. Several important insights were revealed. First, density functional theory (DFT) calculations provided detailed structural information regarding the regio- and stereoselective chain-growth step. Specifically, the absolute stereochemistry of the binaphthol linker determines the enantiomer preference in the polymerization, and the interaction between the salen ligand and the growing polymer chain is a fundamental aspect of enantioselectivity. Second, a new bimetallic catalyst with a conformationally flexible biphenol linker was synthesized and found to enantioselectively polymerize PO, though with lower enantioselectivity than the binaphthol linked catalysts. Third, DFT calculations revealed that the active form of the catalyst has two active exo anionic ligands (chloride or carboxylate) and an endo polymer alkoxide which can ring-open an adjacent cobalt-coordinated epoxide. Fourth, calculations showed that initiation is favored by an endo chloride ligand, while propagation is favored by the presence of two exo carboxylate ligands.
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Affiliation(s)
- Syud M Ahmed
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
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98
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Ford DD, Nielsen LPC, Zuend SJ, Musgrave CB, Jacobsen EN. Mechanistic basis for high stereoselectivity and broad substrate scope in the (salen)Co(III)-catalyzed hydrolytic kinetic resolution. J Am Chem Soc 2013; 135:15595-608. [PMID: 24041239 PMCID: PMC3875305 DOI: 10.1021/ja408027p] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the (salen)Co(III)-catalyzed hydrolytic kinetic resolution (HKR) of terminal epoxides, the rate- and stereoselectivity-determining epoxide ring-opening step occurs by a cooperative bimetallic mechanism with one Co(III) complex acting as a Lewis acid and another serving to deliver the hydroxide nucleophile. In this paper, we analyze the basis for the extraordinarily high stereoselectivity and broad substrate scope observed in the HKR. We demonstrate that the stereochemistry of each of the two (salen)Co(III) complexes in the rate-determining transition structure is important for productive catalysis: a measurable rate of hydrolysis occurs only if the absolute stereochemistry of each of these (salen)Co(III) complexes is the same. Experimental and computational studies provide strong evidence that stereochemical communication in the HKR is mediated by the stepped conformation of the salen ligand, and not the shape of the chiral diamine backbone of the ligand. A detailed computational analysis reveals that the epoxide binds the Lewis acidic Co(III) complex in a well-defined geometry imposed by stereoelectronic rather than steric effects. This insight serves as the basis of a complete stereochemical and transition structure model that sheds light on the reasons for the broad substrate generality of the HKR.
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Affiliation(s)
- David D Ford
- Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts 02138, United States
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99
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Liu Y, Ren WM, Liu J, Lu XB. Asymmetric Copolymerization of CO2withmeso-Epoxides Mediated by Dinuclear Cobalt(III) Complexes: Unprecedented Enantioselectivity and Activity. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305154] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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100
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Liu Y, Ren WM, Liu J, Lu XB. Asymmetric copolymerization of CO2 with meso-epoxides mediated by dinuclear cobalt(III) complexes: unprecedented enantioselectivity and activity. Angew Chem Int Ed Engl 2013; 52:11594-8. [PMID: 24019292 DOI: 10.1002/anie.201305154] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Revised: 07/22/2013] [Indexed: 11/10/2022]
Abstract
Unprecedented enantioselectivity and catalytic activity was observed in the asymmetric copolymerization of CO2 with meso-epoxides (including the less reactive cyclopentene oxide) mediated by the dinuclear Co(III) complex (S,S,S,S)-1 under mild conditions. The resultant copolymers possess more than 99 % carbonate linkages and a perfectly isotactic structure.
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Affiliation(s)
- Ye Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (P. R. China)
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