101
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Chen TTD, Zhu Y, Williams CK. Pentablock Copolymer from Tetracomponent Monomer Mixture Using a Switchable Dizinc Catalyst. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01224] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Thomas T. D. Chen
- Department of Chemistry, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Yunqing Zhu
- Department of Chemistry, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Charlotte K. Williams
- Department of Chemistry, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
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102
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Hu C, Duan R, Yang S, Pang X, Chen X. CO2 Controlled Catalysis: Switchable Homopolymerization and Copolymerization. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00696] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Chenyang Hu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Ranlong Duan
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Shengcai Yang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
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103
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Dadashi-Silab S, Matyjaszewski K. Temporal Control in Atom Transfer Radical Polymerization Using Zerovalent Metals. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00698] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Sajjad Dadashi-Silab
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
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104
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Seifert TP, Brunner TS, Fischer TS, Barner-Kowollik C, Roesky PW. Chiral Mono(borohydride) Complexes of Scandium and Lutetium and Their Catalytic Activity in Ring-Opening Polymerization of dl-Lactide. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00172] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tim P. Seifert
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
| | - Tobias S. Brunner
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
| | - Tobias S. Fischer
- Macromolecular Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76128 Karlsruhe, Germany
- Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Christopher Barner-Kowollik
- Macromolecular Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76128 Karlsruhe, Germany
- Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
| | - Peter W. Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
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105
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Stereoselective photoredox ring-opening polymerization of O-carboxyanhydrides. Nat Commun 2018; 9:1559. [PMID: 29674720 PMCID: PMC5908805 DOI: 10.1038/s41467-018-03879-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 03/20/2018] [Indexed: 11/19/2022] Open
Abstract
Biodegradable polyesters with various tacticities have been synthesized by means of stereoselective ring-opening polymerization of racemic lactide and β-lactones but with limited side-chain groups. However, stereoselective synthesis of functional polyesters remains challenging from O-carboxyanhydrides that have abundant pendant side-chain functional groups. Herein we report a powerful strategy to synthesize stereoblock polyesters by stereoselective ring-opening polymerization of racemic O-carboxyanhydrides with the use of photoredox Ni/Ir catalysts and a selected Zn complex with an achiral ligand. The obtained stereoblock copolymers are highly isotactic with high molecular weights ( > 70 kDa) and narrow molecular weight distributions (Mw/Mn < 1.1), and they display distinct melting temperatures that are similar to their stereocomplex counterparts. Furthermore, in one-pot photoredox copolymerization of two different O-carboxyanhydrides, the use of such Zn complex mediates kinetic resolution of the comonomers during enchainment and shows a chirality preference that allows for the synthesis of gradient copolymers. The stereoselective synthesis of polyesters has been achieved via various methods; however, all routes show limited side-chain group functionality. Here the authors synthesize stereoblock polyesters by photoredox ring-opening polymerization of racemic O-carboxyanhydrides that have abundant side-chain functionality.
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106
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Hu CY, Duan RL, Yang JW, Dong SJ, Sun ZQ, Pang X, Wang XH, Chen XS. Enolic Schiff Base Zinc Amide Complexes: Highly Active Catalysts for Ring-Opening Polymerization of Lactide and ε-Caprolactone. CHINESE JOURNAL OF POLYMER SCIENCE 2018. [DOI: 10.1007/s10118-018-2129-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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107
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Lin B, Waymouth RM. Organic Ring-Opening Polymerization Catalysts: Reactivity Control by Balancing Acidity. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00540] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Binhong Lin
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Robert M. Waymouth
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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108
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Liu DC, Li CY, Lin PH, Chen JD, Tsai CY, Lin CH, Ko BT. Titanium complexes bearing benzotriazole iminophenolate ligands as efficient catalysts for ring-opening polymerization of cyclic esters. INORG CHEM COMMUN 2018. [DOI: 10.1016/j.inoche.2018.01.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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109
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A convenient method to prepare random LA/CL copolymers from poly(L-lactide) and ε-caprolactone. Sci China Chem 2018. [DOI: 10.1007/s11426-017-9212-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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110
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Zhu N, Liu Y, Liu J, Ling J, Hu X, Huang W, Feng W, Guo K. Organocatalyzed chemoselective ring-opening polymerizations. Sci Rep 2018; 8:3734. [PMID: 29487371 PMCID: PMC5829214 DOI: 10.1038/s41598-018-22171-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 02/19/2018] [Indexed: 11/26/2022] Open
Abstract
A novel metal-free and protecting-group-free synthesis method to prepare telechelic thiol-functionalized polyesters is developed by employing organocatalysis. A scope of Brønsted acids, including trifluoromethanesulfonic acid (1), HCl.Et2O (2), diphenyl phosphate (3), γ-resorcylic acid (4) and methanesulfonic acid (5), are evaluated to promote ring-opening polymerization of ε-caprolactone with unprotected 6-mercapto-1-hexanol as the multifunctional initiator. Among them, diphenyl phosphate (3) exhibits great chemoselectivity and efficiency, which allows for simply synthesis of thiol-terminated poly(ε-caprolactone) with near-quantitative thiol fidelity, full monomer conversion, controlled molecular weight and narrow polydispersity. Kinetic study confirms living/controlled nature of the organocatalyzed chemoselective polymerizations. Density functional theory calculation illustrates that the chemoselectivity of diphenyl phosphate (3) is attributed to the stronger bifunctional activation of monomer and initiator/chain-end as well as the lower energy in hydroxyl pathway than thiol one. Moreover, series of tailor-made telechelic thiol-terminated poly(δ-valerolactone) and block copolymers are efficiently generated under mild conditions.
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Affiliation(s)
- Ning Zhu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211800, China
| | - Yihuan Liu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211800, China
| | - Junhua Liu
- Department of Polymer Science and Engineering, Key Laboratory of Macromolecular Synthesis and Functionalization of the Ministry of Education, Zhejiang University, Hangzhou, 310027, China
- Zhejiang Center for Drug & Cosmetic Evaluation, Hangzhou, 310012, China
| | - Jun Ling
- Department of Polymer Science and Engineering, Key Laboratory of Macromolecular Synthesis and Functionalization of the Ministry of Education, Zhejiang University, Hangzhou, 310027, China
| | - Xin Hu
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211800, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211800, China
| | - Weijun Huang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211800, China
| | - Weiyang Feng
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211800, China
| | - Kai Guo
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211800, China.
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 211800, China.
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211800, China.
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111
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Chen L, Li L, Sampson NS. Access to Bicyclo[4.2.0]octene Monomers To Explore the Scope of Alternating Ring-Opening Metathesis Polymerization. J Org Chem 2018; 83:2892-2897. [PMID: 29406722 PMCID: PMC5838619 DOI: 10.1021/acs.joc.8b00054] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
![]()
Bicyclo[4.2.0]oct-1(8)-ene-8-carboxamides
undergo alternating ring-opening
metathesis polymerization (AROMP) with cyclohexene. Herein, a general
method for the preparation of bicyclo[4.2.0]oct-(8)-ene-8-carboxy
derivatives is described. The central 8-cyano intermediate provides
entry to five different functional group substituents on the alkene.
These monomers were tested as potential substrates for AROMP with
cyclohexene. In addition to the carboxamide, the carboxynitrile and
carboxaldehyde are also substrates for AROMP. In the case of the carboxaldehyde,
the polymer is regioregular. However, the addition of carboxynitrile
is stereoirregular and slow.
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Affiliation(s)
- Lei Chen
- Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States
| | - Liqiang Li
- Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States
| | - Nicole S Sampson
- Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States
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112
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Synthesis and structure characterization of homoleptic lanthanide complexes stabilized by Schiff-base ligands and their application in the polymerization of ε-caprolactone. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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113
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114
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Ortuño MA, Dereli B, Chiaie KRD, Biernesser AB, Qi M, Byers JA, Cramer CJ. The Role of Alkoxide Initiator, Spin State, and Oxidation State in Ring-Opening Polymerization of ε-Caprolactone Catalyzed by Iron Bis(imino)pyridine Complexes. Inorg Chem 2018; 57:2064-2071. [PMID: 29381341 DOI: 10.1021/acs.inorgchem.7b02964] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Density functional theory (DFT) is employed to characterize in detail the mechanism for the ring-opening polymerization (ROP) of ε-caprolactone catalyzed by iron alkoxide complexes bearing redox-active bis(imino)pyridine ligands. The combination of iron with the non-innocent bis(imino)pyridine ligand permits comparison of catalytic activity as a function of oxidation state (and overall spin state). The reactivities of aryl oxide versus alkoxide initiators for the ROP of ε-caprolactone are also examined. An experimental test of a computational prediction reveals an Fe(III) bis(imino)pyridine bis-neopentoxide complex to be competent for ROP of ε-caprolactone.
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Affiliation(s)
- Manuel A Ortuño
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Büsra Dereli
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Kayla R Delle Chiaie
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Ashley B Biernesser
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Miao Qi
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Jeffery A Byers
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Christopher J Cramer
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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115
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Stößer T, Chen TTD, Zhu Y, Williams CK. 'Switch' catalysis: from monomer mixtures to sequence-controlled block copolymers. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2018; 376:20170066. [PMID: 29175903 PMCID: PMC5719223 DOI: 10.1098/rsta.2017.0066] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
A 'Switch' catalysis method is reviewed whereby a single catalyst is switched between ring-opening polymerization and ring-opening copolymerization cycles. It allows the efficient synthesis of block copolymers from mixtures of lactones, epoxides, anhydrides and carbon dioxide. In order to use and further develop such 'Switch' catalysis, it is important to understand how to monitor the catalysis and characterize the product block copolymers. Here, a step-by-step guide to both the catalysis and the identification of block copolymers is presented.This article is part of a discussion meeting issue 'Providing sustainable catalytic solutions for a rapidly changing world'.
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Affiliation(s)
- T Stößer
- Department of Chemistry, University of Oxford, Chemical Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
| | - T T D Chen
- Department of Chemistry, University of Oxford, Chemical Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
| | - Y Zhu
- Department of Chemistry, University of Oxford, Chemical Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
| | - C K Williams
- Department of Chemistry, University of Oxford, Chemical Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, UK
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116
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Liu Y, Wang X, Li Z, Wei F, Zhu H, Dong H, Chen S, Sun H, Yang K, Guo K. A switch from anionic to bifunctional H-bonding catalyzed ring-opening polymerizations towards polyether–polyester diblock copolymers. Polym Chem 2018. [DOI: 10.1039/c7py01842h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A switch of an anionic ROP of epoxides into a bifunctional H-bonding ROP of cyclic esters paved a new avenue to one-pot, sequential, and block copolymerizations to previously rare polyether-block-polyester copolymers.
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117
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Li X, Hu C, Pang X, Duan R, Chen X. One-pot copolymerization of epoxides/carbon dioxide and lactide using a ternary catalyst system. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01856a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A PLA/PPC multiblock copolymer was prepared using a novel ternary catalytic system that proceeds via an intermolecular chain transfer mechanism.
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Affiliation(s)
- Xiang Li
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Chenyang Hu
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Ranlong Duan
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
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118
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Daneshmand P, Michalsky I, Aguiar PM, Schaper F. Configurationally flexible zinc complexes as catalysts for rac-lactide polymerisation. Dalton Trans 2018; 47:16279-16291. [DOI: 10.1039/c8dt02562b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Introduction of catalytic site flexibility (fast racemisation) into a previously reported zinc alkoxide catalyst afforded a slight preference for isotactic lactide polymerization via catalytic-site mediated chain-end control.
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Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis
- Department of chemistry
- Université deMontréal
- Montréal
- Canada
| | - Ina Michalsky
- Centre in Green Chemistry and Catalysis
- Department of chemistry
- Université deMontréal
- Montréal
- Canada
| | - Pedro M. Aguiar
- Centre in Green Chemistry and Catalysis
- Department of chemistry
- Université deMontréal
- Montréal
- Canada
| | - Frank Schaper
- Centre in Green Chemistry and Catalysis
- Department of chemistry
- Université deMontréal
- Montréal
- Canada
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119
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Arif T, Cazorla C, Bogliotti N, Saleh N, Blanchard F, Gandon V, Métivier R, Xie J, Voituriez A, Marinetti A. Bimetallic gold(i) complexes of photoswitchable phosphines: synthesis and uses in cooperative catalysis. Catal Sci Technol 2018. [DOI: 10.1039/c7cy01614j] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first photoswitchable bimetallic gold catalysts based on an azobenzene backbone have been synthesized and their catalytic properties have been investigated.
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120
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Ligny R, Hänninen MM, Guillaume SM, Carpentier JF. Steric vs. electronic stereocontrol in syndio- or iso-selective ROP of functional chiral β-lactones mediated by achiral yttrium-bisphenolate complexes. Chem Commun (Camb) 2018; 54:8024-8031. [DOI: 10.1039/c8cc03842b] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Electronic vs. steric effects of ligand ortho-substituents in (bis)phenolate yttrium-based complexes for preparation of a large scope of stereoregular poly(3-hydroxyalkanoate)s.
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Affiliation(s)
- Romain Ligny
- Univ. Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes
| | | | - Sophie M. Guillaume
- Univ. Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes
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121
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Monga S, Kaushik A, Gupta B. Optimization of controlled ring-opening polymerization of l-lactide to hydroxyl terminated polylactides using zinc acetate catalyst. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-1991-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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122
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Dong H, Zhu Y, Li Z, Xu J, Liu J, Xu S, Wang H, Gao Y, Guo K. Dual Switching in Both RAFT and ROP for Generation of Asymmetric A2A1B1B2 Type Tetrablock Quaterpolymers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01784] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- He Dong
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Yuejia Zhu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Zhenjiang Li
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Jiaxi Xu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Jingjing Liu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Songquan Xu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Haixin Wang
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Yu Gao
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Kai Guo
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
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123
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Osten KM, Mehrkhodavandi P. Indium Catalysts for Ring Opening Polymerization: Exploring the Importance of Catalyst Aggregation. Acc Chem Res 2017; 50:2861-2869. [PMID: 29087695 DOI: 10.1021/acs.accounts.7b00447] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Inexorably, the environmental persistence and damage caused by polyolefins have become major drawbacks to their continued long-term use. Global shifts in thinking from fossil-fuel to renewable biobased resources have urged researchers to focus their attention on substituting fossil-fuel based polymers with renewable and biodegradable alternatives on an industrial scale. The recent development of biodegradable polyesters from ring opening polymerization (ROP) of bioderived cyclic ester monomers has emerged as a promising new avenue toward this goal. Ever increasing numbers of metal-based initiators have been reported in the literature for the controlled ROP of cyclic esters, in particular for the polymerization of lactide to produce poly(lactic acid) (PLA). PLA has several material weaknesses, which hinder its use as a replacement for commodity plastics. Despite many advances in developing highly active and controlled catalysts for lactide polymerization, no single catalyst system has emerged to replace industrially used catalysts and provide access to PLA materials with improved properties. We reported the first example of indium(III) for the ring opening polymerization of lactide. Since then, indium(III) has emerged as a useful Lewis acid in initiators for the controlled polymerization of lactide and other cyclic esters. In particular, we have developed a large family of chiral dinuclear indium complexes bearing tridentate diaminophenolate ligands and tetradentate salen and salan ligands. Complexes within our tridentate ligand family are highly active initiators for the moderately isoselective living and immortal polymerization of rac-lactide, as well as other cyclic esters. We have shown that subtle steric effects influence aggregation in these systems, with polymerization typically proceeding through a dinuclear propagating species. In addition, profound effects on polymerization activities have been observed for central tertiary versus secondary amine donors in these and other related systems. In contrast, our well-controlled and highly active chiral indium salen systems are more isoselective than the tridentate analogues and polymerize lactide via a mononuclear propagating species. Again, we have noticed that subtle steric and electronic changes to the ligand can influence both polymerization activity and stereoselectivity via aggregation phenomena. Recently, we have reported a promising new chiral indium catalyst supported by a tetradentate salan ligand. This catalyst is remarkably water and air stable and can be activated by linear and branched alcohols to provide controlled access to multiblock copolymers in air. This catalyst represents an important step forward toward generating new, commercially relevant catalysts for ROP of cyclic esters to produce novel biodegradable polymers, and highlights the unique value of indium-based catalysts in the field.
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Affiliation(s)
- Kimberly M. Osten
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
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124
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Ghosh S, Spannenberg A, Mejía E. Cubane-Type Polynuclear Zinc Complexes Containing Tridentate Schiff
Base Ligands: Synthesis, Characterization, and Ring-Opening Polymerization Studies of rac
-Lactide and ε
-Caprolactone. Helv Chim Acta 2017. [DOI: 10.1002/hlca.201700176] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Swarup Ghosh
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Anke Spannenberg
- 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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125
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Stasiw DE, Luke AM, Rosen T, League AB, Mandal M, Neisen BD, Cramer CJ, Kol M, Tolman WB. Mechanism of the Polymerization of rac-Lactide by Fast Zinc Alkoxide Catalysts. Inorg Chem 2017; 56:14366-14372. [DOI: 10.1021/acs.inorgchem.7b02544] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Daniel E. Stasiw
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Anna M. Luke
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Tomer Rosen
- The School of Chemistry, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - Aaron B. League
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Mukunda Mandal
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Benjamin D. Neisen
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Christopher J. Cramer
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Moshe Kol
- The School of Chemistry, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - William B. Tolman
- Department of Chemistry,
Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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126
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Quan SM, Wei J, Diaconescu PL. Mechanistic Studies of Redox-Switchable Copolymerization of Lactide and Cyclohexene Oxide by a Zirconium Complex. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00672] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Stephanie M. Quan
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Junnian Wei
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
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127
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Zhang X, Fevre M, Jones GO, Waymouth RM. Catalysis as an Enabling Science for Sustainable Polymers. Chem Rev 2017; 118:839-885. [DOI: 10.1021/acs.chemrev.7b00329] [Citation(s) in RCA: 472] [Impact Index Per Article: 67.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xiangyi Zhang
- Department
of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Mareva Fevre
- IBM Research−Almaden, 650 Harry Road, San Jose, California 95120, United States
| | - Gavin O. Jones
- IBM Research−Almaden, 650 Harry Road, San Jose, California 95120, United States
| | - Robert M. Waymouth
- Department
of Chemistry, Stanford University, Stanford, California 94305-5080, United States
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128
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Datta PP, Pothupitiya JU, Kiesewetter ET, Kiesewetter MK. Coupled equilibria in H-bond donating ring-opening polymerization: The effective catalyst-determined shift of a polymerization equilibrium. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.05.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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129
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Nie K, Wang C, Han Y, Zhang J, Yao Y. Lanthanide complexes supported by phenolate-possessing aroylhydrazone: Synthesis, characterization and lactides polymerization. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.06.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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130
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Ebrahimi T, Aluthge DC, Patrick BO, Hatzikiriakos SG, Mehrkhodavandi P. Air- and Moisture-Stable Indium Salan Catalysts for Living Multiblock PLA Formation in Air. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01939] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tannaz Ebrahimi
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
- Department
of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC Canada, V6T1Z3
| | - Dinesh C. Aluthge
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
| | - Brian O. Patrick
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
| | - Savvas G. Hatzikiriakos
- Department
of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC Canada, V6T1Z3
| | - Parisa Mehrkhodavandi
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
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131
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Daneshmand P, van der Est A, Schaper F. Mechanism and Stereocontrol in Isotactic rac-Lactide Polymerization with Copper(II) Complexes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02049] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pargol Daneshmand
- Centre
in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Art van der Est
- Department
of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | - Frank Schaper
- Centre
in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
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132
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Chandanabodhi D, Nanok T. A DFT study of the ring-opening polymerization mechanism of l-lactide and ε-caprolactone using aluminium salen-type initiators: Towards an understanding of their reactivities in homo- and copolymerization. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.04.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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133
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Kosuru SR, Sun TH, Wang LF, Vandavasi JK, Lu WY, Lai YC, Hsu SCN, Chiang MY, Chen HY. Enhanced Catalytic Activity of Aluminum Complexes for the Ring-Opening Polymerization of ε-Caprolactone. Inorg Chem 2017; 56:7998-8006. [DOI: 10.1021/acs.inorgchem.7b00763] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
| | | | | | | | | | | | | | - Michael Y. Chiang
- Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, R.O.C
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134
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Keram M, Ma H. Ring-opening polymerization of lactide, ε
-caprolactone and their copolymerization catalyzed by β
-diketiminate zinc complexes. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3893] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Maryam Keram
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry and Molecular Engineering, East China University of Science and Technology; 130 Meilong Road Shanghai 200237 China
| | - Haiyan Ma
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry and Molecular Engineering, East China University of Science and Technology; 130 Meilong Road Shanghai 200237 China
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135
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Feyrer A, Armbruster MK, Fink K, Breher F. Metal Complexes of a Redox-Active [1]Phosphaferrocenophane: Structures, Electrochemistry and Redox-Induced Catalysis. Chemistry 2017; 23:7402-7408. [DOI: 10.1002/chem.201700868] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Alexander Feyrer
- Institute of Inorganic Chemistry; Division Molecular Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
| | - Markus K. Armbruster
- Institute of Nanotechnology; Karlsruhe Institute of Technology (KIT), Postfach 3630; 76021 Karlsruhe Germany
| | - Karin Fink
- Institute of Nanotechnology; Karlsruhe Institute of Technology (KIT), Postfach 3630; 76021 Karlsruhe Germany
| | - Frank Breher
- Institute of Inorganic Chemistry; Division Molecular Chemistry; Karlsruhe Institute of Technology (KIT); Engesserstr. 15 76131 Karlsruhe Germany
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136
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Yao C, Yang Y, Xu S, Ma H. Potassium complexes supported by monoanionic tetradentate amino-phenolate ligands: synthesis, structure and catalysis in the ring-opening polymerization of rac-lactide. Dalton Trans 2017; 46:6087-6097. [PMID: 28430280 DOI: 10.1039/c7dt00812k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of potassium complexes bearing monoanionic tetradentate amino-phenolate ligands, [LK]2 (L = {(2-R1)C6H4CH2N[(CH2)2R2]CH2(4-R4-6-R3)C6H2O-}, R1 = NMe2, R2 = NEt2, R3 = CPh3, R4 = Me (1); R1 = R2 = NEt2, R3 = CPh3, R4 = Me (2); R1 = NMe2, R2 = NEt2, R3 = R4 = cumyl (4); R1 = R2 = OMe, R3 = tBu, R4 = Me (6); L = (2-NMe2)C6H4CH2N[[CH2-(S)-1-butylpyrrolidinyl]CH2(4-Me-6-CPh3)C6H2O-] (3)), have been synthesized via reactions of KN(SiMe3)2 and 1 equiv. of the corresponding aminophenols. The solid-state structures of typical complexes 4 and 6 are determined via X-ray diffraction studies, which reveal the dinuclear nature of these complexes. By contrast, DOSY measurements of 1, 4 and 6 suggest that these complexes are monomeric in solution. It is noteworthy that the coordination chemistry of these potassium complexes is versatile, which is closely related to the nature of the ortho-substituent of the phenolate ring, as indicated by the results of the corresponding spectroscopic studies. In the presence of iPrOH, 1-4 and 6 could initiate the polymerization of 500 equiv. of rac-lactide to achieve high monomer conversions within several minutes but afford atactic PLAs with slightly isotactic-enriched microstructures (Pm = 0.58-0.60). Experimental results also demonstrated that a bulky trityl substituent at the ortho-position of the phenolate ring of the ligand framework is beneficial for the enhancement of the activities of these potassium complexes.
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Affiliation(s)
- Chenhui Yao
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
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137
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Lee CL, Lin YF, Jiang MT, Lu WY, Vandavasi JK, Wang LF, Lai YC, Chiang MY, Chen HY. Improvement in Aluminum Complexes Bearing Schiff Bases in Ring-Opening Polymerization of ε-Caprolactone: A Five-Membered-Ring System. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00068] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Chieh-Ling Lee
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Ya-Fan Lin
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
- Department
of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Man-Ting Jiang
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Wei-Yi Lu
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | | | - Li-Fang Wang
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Yi-Chun Lai
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Michael Y. Chiang
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
- Department
of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Hsuan-Ying Chen
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
- Department
of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan, Republic of China
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138
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Nifant’ev IE, Ivchenko PV, Shlyakhtin AV, Ivanyuk AV. Polymerization of trimethylene carbonate and lactones in the presence of magnesium monoionolate: A comparative theoretical and experimental study. POLYMER SCIENCE SERIES B 2017. [DOI: 10.1134/s1560090417020075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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139
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Dharmaratne NU, Pothupitiya JU, Bannin TJ, Kazakov OI, Kiesewetter MK. Triclocarban: Commercial Antibacterial and Highly Effective H-Bond Donating Catalyst for Ring-Opening Polymerization. ACS Macro Lett 2017; 6:421-425. [PMID: 35610842 DOI: 10.1021/acsmacrolett.7b00111] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The antibacterial compound, triclocarban (TCC), is shown to be a highly effective H-bond donating catalyst for ring-opening polymerization (ROP) when applied with an H-bond accepting base cocatalyst. These ROPs exhibit the characteristics of "living" polymerizations. TCC is shown to possess the high activity characteristic of urea (vs thiourea) H-bond donors. The urea class of H-bond donors is shown to remain highly active in H-bonding solvents, a trait that is not displayed by the corresponding thiourea H-bond donors. Two H-bond donating ureas that are electronically similar to TCC are evaluated for their efficacy in ROP, and a mechanism of action is proposed. This "off-the-shelf" H-bond donor is among the most active and most controlled organocatalysts for the ROP of lactones.
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Affiliation(s)
| | - Jinal U. Pothupitiya
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Timothy J. Bannin
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Oleg I. Kazakov
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Matthew K. Kiesewetter
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
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140
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Semwal S, Choudhury J. Switch in Catalyst State: Single Bifunctional Bi-state Catalyst for Two Different Reactions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702142] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shrivats Semwal
- Organometallics & Smart Materials Laboratory, Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal 462066 India
| | - Joyanta Choudhury
- Organometallics & Smart Materials Laboratory, Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal 462066 India
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141
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Semwal S, Choudhury J. Switch in Catalyst State: Single Bifunctional Bi-state Catalyst for Two Different Reactions. Angew Chem Int Ed Engl 2017; 56:5556-5560. [DOI: 10.1002/anie.201702142] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 03/22/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Shrivats Semwal
- Organometallics & Smart Materials Laboratory, Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal 462066 India
| | - Joyanta Choudhury
- Organometallics & Smart Materials Laboratory, Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal 462066 India
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142
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Myers D, White AJP, Forsyth CM, Bown M, Williams CK. Phosphasalen Indium Complexes Showing High Rates and Isoselectivities in rac
-Lactide Polymerizations. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701745] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Dominic Myers
- Department of Chemistry; Imperial College London; London SW7 2AZ UK
| | | | - Craig M. Forsyth
- School of Chemistry; Monash University; Clayton VIC 3800 Australia
| | - Mark Bown
- CSIRO Manufacturing; Bayview Avenue Clayton VIC 3168 Australia
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143
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Myers D, White AJP, Forsyth CM, Bown M, Williams CK. Phosphasalen Indium Complexes Showing High Rates and Isoselectivities in rac-Lactide Polymerizations. Angew Chem Int Ed Engl 2017; 56:5277-5282. [PMID: 28378455 PMCID: PMC5434947 DOI: 10.1002/anie.201701745] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 11/06/2022]
Abstract
Polylactide (PLA) is the leading bioderived polymer produced commercially by the metal-catalyzed ring-opening polymerization of lactide. Control over tacticity to produce stereoblock PLA, from rac-lactide improves thermal properties but is an outstanding challenge. Here, phosphasalen indium catalysts feature high rates (30±3 m-1 min-1 , THF, 298 K), high control, low loadings (0.2 mol %), and isoselectivity (Pi =0.92, THF, 258 K). Furthermore, the phosphasalen indium catalysts do not require any chiral additives.
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Affiliation(s)
- Dominic Myers
- Department of Chemistry, Imperial College London, London, SW7 2AZ, UK
| | - Andrew J P White
- Department of Chemistry, Imperial College London, London, SW7 2AZ, UK
| | - Craig M Forsyth
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
| | - Mark Bown
- CSIRO Manufacturing, Bayview Avenue, Clayton, VIC, 3168, Australia
| | - Charlotte K Williams
- Department of Chemistry, Oxford University, 12 Mansfield Road, Oxford, OX1 3TA, UK
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144
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Liu ZT, Li CY, Chen JD, Liu WL, Tsai CY, Ko BT. Titanium, aluminum and zinc complexes containing diamine-bis(benzotriazole phenolate) ligands: Synthesis, structural characterization and catalytic studies for ring-opening polymerization of ε-caprolactone. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.12.081] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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145
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Saini PK, Fiorani G, Mathers RT, Williams CK. Zinc versus Magnesium: Orthogonal Catalyst Reactivity in Selective Polymerizations of Epoxides, Bio-derived Anhydrides and Carbon Dioxide. Chemistry 2017; 23:4260-4265. [PMID: 28295663 PMCID: PMC5434931 DOI: 10.1002/chem.201605690] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Indexed: 12/30/2022]
Abstract
Developing selective polymerizations from complex monomer mixtures is an important challenge. Here, dinuclear catalysts allow selective polymerization from mixtures of sterically hindered tricyclic anhydrides, carbon dioxide and epoxides to yield well-controlled copoly(ester-carbonates). Surprisingly, two very similar homogeneous catalysts differing only in the central metal, zinc versus magnesium, show very high but diametrically opposite monomer selectivity. The selectivity is attributed to different polymerization kinetics and to steric factors associated with the anhydrides.
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Affiliation(s)
| | - Giulia Fiorani
- Department of ChemistryUniversity of Oxford, Chemical Research Laboratory12 Mansfield RoadOxfordOX1 3TAUK
| | - Robert T. Mathers
- Department of ChemistryThe Pennsylvania State UniversityNew KensingtonPennsylvania15068USA
| | - Charlotte K. Williams
- Department of ChemistryUniversity of Oxford, Chemical Research Laboratory12 Mansfield RoadOxfordOX1 3TAUK
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146
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Wei J, Riffel MN, Diaconescu PL. Redox Control of Aluminum Ring-Opening Polymerization: A Combined Experimental and DFT Investigation. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02402] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Junnian Wei
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Madeline N. Riffel
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
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147
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Zinc and aluminum complexes of chiral ligands: Synthesis, characterization and application to rac-lactide polymerization. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.12.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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148
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Lastovickova DN, Shao H, Lu G, Liu P, Bielawski CW. A Ring-Opening Metathesis Polymerization Catalyst That Exhibits Redox-Switchable Monomer Selectivities. Chemistry 2017; 23:5994-6000. [PMID: 27977049 DOI: 10.1002/chem.201605738] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Indexed: 12/20/2022]
Abstract
A ring-opening metathesis polymerization catalyst supported by a redox-active N-heterocyclic carbene was synthesized and found to undergo reversible reduction. In its neutral form, the catalyst polymerized 1,5-cis,cis-cyclooctadiene at a higher rate than that of a norbornene derivative; however, upon reduction, the selectivity was found to reverse. Utilizing this oxidation state dependent selectivity, a series of copolymers with controlled compositions, microstructures, and physical properties were prepared by redox-switching the catalyst over the course of a series of polymerization reactions.
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Affiliation(s)
- Dominika N Lastovickova
- Department of Chemistry, The University of Texas at Austin, 1 University Station, A1590, Austin, TX, 78712, USA
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Huiling Shao
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Gang Lu
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, 3700 O'Hara Street, Pittsburgh, PA, 15261, USA
| | - Christopher W Bielawski
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Chemistry and Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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149
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Walz F, Moos E, Garnier D, Köppe R, Anson CE, Breher F. A Redox-Switchable Germylene and its Ligating Properties in Selected Transition Metal Complexes. Chemistry 2017; 23:1173-1186. [PMID: 27883244 DOI: 10.1002/chem.201605073] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Indexed: 12/22/2022]
Abstract
The synthesis, structure, and full characterization of a redox-switchable germylene based on a [3]ferrocenophane ligand arrangement, [Fc(NMes)2 Ge] (4), is presented. The mesityl (Mes)-substituted title compound is readily available from Fc(NHMes)2 (2) and Ge{N(SiMe3 )2 }2 , or from the dilithiated, highly air- and moisture-sensitive compound Fc(NLiMes)2 ⋅3 Et2 O (3) and GeCl2 . Cyclic voltammetry studies are provided for 4, confirming the above-mentioned view of a redox-switchable germylene metalloligand. Although several 1:1 RhI and IrI complexes of 4 (5-7) are cleanly formed in solution, all attempts to isolate them in pure form failed due to stability problems. However, crystalline solids of [Mo(κ1 Ge-4)2 (CO)4 ] (8) and [W(κ1 Ge-4)2 (CO)4 ] (9) were isolated and fully characterized by common spectroscopic techniques (8 by X-ray diffraction). DFT calculations were performed on a series of model compounds to elucidate a conceivable interplay between the metal atoms in neutral and cationic bimetallic complexes of the type [Rh(κ1 E-qE)(CO)2 Cl]0/+ (qE=[Fc(NPh)2 E] with E=C, Si, Ge). The bonding characteristics of the coordinated Fc-based metalloligands (qE/qE+ ) are strongly affected upon in silico oxidation of the calculated complexes. The calculated Tolman electronic parameter (TEP) significantly increases by approximately 20 cm-1 (E=C) to 25 cm-1 (E=Si, Ge) upon oxidation. The change in the ligand-donating abilities upon oxidation can mainly be attributed to Coulombic effects, whereas an orbital-based interaction appears to have only a minor influence.
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Affiliation(s)
- Florian Walz
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131, Karlsruhe, Germany
| | - Eric Moos
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131, Karlsruhe, Germany
| | - Delphine Garnier
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131, Karlsruhe, Germany.,Institute of Organic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Ralf Köppe
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131, Karlsruhe, Germany
| | - Christopher E Anson
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131, Karlsruhe, Germany
| | - Frank Breher
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131, Karlsruhe, Germany
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150
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Oetzel J, Weyer N, Bruhn C, Leibold M, Gerke B, Pöttgen R, Maier M, Winter RF, Holthausen MC, Siemeling U. Redox-Active N-Heterocyclic Germylenes and Stannylenes with a Ferrocene-1,1'-diyl Backbone. Chemistry 2017; 23:1187-1199. [PMID: 27859833 DOI: 10.1002/chem.201605074] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 11/16/2016] [Indexed: 12/20/2022]
Abstract
We describe ferrocene-based N-heterocyclic germylenes and stannylenes of the type [Fe{(η5 -C5 H4 )NR}2 E:] (1 RE; E=Ge, Sn; R=neopentyl (Np), mesityl (Mes), trimethylsilyl (TMS)), which constitute the first examples of redox-functionalised N-heterocyclic tetrylenes (NHTs). These compounds are thermally stable and were structurally characterised by means of X-ray diffraction studies, except for the neopentyl-substituted stannylene 1 NpSn, the decomposition of which afforded the aminoiminoferrocene [fc(NHCH2 tBu)(N=CHtBu)] (2) and the spiro tin(IV) compound (1 Np)2 Sn (3). DFT calculations show that the HOMO of the NHTs of our study is localised on the ferrocenylene backbone. A one-electron oxidation process affords ions of the type 1 RE+. . In contrast to the NHC system 1 RC, the localised ferrocenium-type nature of the oxidised form does not compromise the fundamental tetrylene character of 1 RE+. .
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Affiliation(s)
- Jan Oetzel
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Nadine Weyer
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Clemens Bruhn
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Michael Leibold
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Birgit Gerke
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149, Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149, Münster, Germany
| | - Markus Maier
- Fachbereich Chemie, Universität Konstanz, Universitätsstrasse 10, 78453, Konstanz, Germany
| | - Rainer F Winter
- Fachbereich Chemie, Universität Konstanz, Universitätsstrasse 10, 78453, Konstanz, Germany
| | - Max C Holthausen
- Institut für Anorganisch und Analytische Chemie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany
| | - Ulrich Siemeling
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
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