1
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Hilche T, Krebs T, Weißbarth H, Lang F, Schnakenburg G, Gansäuer A. Enantio- and Diastereomerically Pure Titanocenes by Dynamic Conformational Locking. Chemistry 2023; 29:e202301645. [PMID: 37283199 DOI: 10.1002/chem.202301645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 06/05/2023] [Accepted: 06/05/2023] [Indexed: 06/08/2023]
Abstract
The synthesis of enantiomerically pure titanocenes is limited to cases with enantiomerically pure substituents at the cyclopentadienyl ligands and to ansa-titanocenes. For the latter complexes, the use of achiral ligands requires a resolution of enantiomers and frequently also a separation of the diastereoisomers obtained after metalation. Here, we introduce a new synthetic method that relies on the use of enantiomerically pure camphorsulfonate (CSA) ligands as control elements for the absolute and relative configuration of titanocene complexes. Starting from the conformationally flexible (RC5 H4 )2 TiCl2 , the desired conformationally locked and hence enantio- and diastereomerically pure complexes (RC5 H4 )2 Ti(CSA)2 are obtained in just two steps. According to X-ray crystallography the (RC5 H4 )2 Ti fragment is essentially C2 -symmetric and nuclear magnetic resonance displays overall C2 -symmetry. We applied density functional theory methods to unravel the dynamics of the complexes and the mechanisms and selectivities of their formation.
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Affiliation(s)
- Tobias Hilche
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Tim Krebs
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Hendrik Weißbarth
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Fabian Lang
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Gregor Schnakenburg
- Institut für Anorganische Chemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Andreas Gansäuer
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
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2
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Bischoff IA, Seydo Meme R, Bhatti MS, Morgenstern B, Schäfer A. Bis(indenyl)tetrelocenophanes: Introducing ansa-Indenyl Ligand Systems to the p-Block. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Inga-Alexandra Bischoff
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Saarland, Germany
| | - Ronay Seydo Meme
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Saarland, Germany
| | - Muniba Shahzad Bhatti
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Saarland, Germany
| | - Bernd Morgenstern
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Saarland, Germany
| | - André Schäfer
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Saarland, Germany
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3
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Zhao Y, Li H, Xin S, Li H, Luo Y, He S. DFT Studies on the Early-Transition-Metal-Catalyzed Polymerization of Polar Monomers with a Methylene Spacer between Vinyl and Functional Groups. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yanan Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Huashu Li
- PetroChina Petrochemical Research Institute, Beijing 102206, China
| | - Shixuan Xin
- PetroChina Petrochemical Research Institute, Beijing 102206, China
| | - Hao Li
- PetroChina Petrochemical Research Institute, Beijing 102206, China
| | - Yi Luo
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
- PetroChina Petrochemical Research Institute, Beijing 102206, China
| | - Shengbao He
- PetroChina Petrochemical Research Institute, Beijing 102206, China
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4
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Staub LH, Lambert J, Müller C, Morgenstern B, Zimmer M, Warken J, Koldemir A, Block T, Pöttgen R, Schäfer A. Bis(di- tert-butylindenyl)tetrelocenes. Dalton Trans 2022; 51:10714-10720. [PMID: 35421889 DOI: 10.1039/d2dt00582d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterization of bis(di-tert-butylindenyl) germanium(II), tin(II) and lead(II) complexes are reported, which includes the first structurally authenticated example of a bis(indenyl)germanocene. The species were studied in detail in solution and in the solid, which includes single crystal X-ray diffraction and NMR spectroscopy, as well as Mössbauer spectroscopy of the tin compound.
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Affiliation(s)
- Liane Hildegard Staub
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
| | - Jessica Lambert
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
| | - Carsten Müller
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
| | - Bernd Morgenstern
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
| | - Michael Zimmer
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
| | - Joshua Warken
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
| | - Aylin Koldemir
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Theresa Block
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - André Schäfer
- Department of Chemistry, Faculty of Natural Sciences and Technology, Saarland University, Campus Saarbrücken, 66123 Saarbrücken, Germany.
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5
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Kumar S, Dholakiya BZ, Jangir R. Role of organometallic complexes in olefin polymerization: a review report. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.122066] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Paradiso V, Capaccio V, Lamparelli DH, Capacchione C. [OSSO]-bisphenolate metal complexes: A powerful and versatile tool in polymerization catalysis. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213644] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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7
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Wiesler S, Younas SL, Kratzert D, Streuff J. Titanocene catalysts with modifiable C-symmetric chiral ligands. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Calderón‐Díaz A, Arras J, Miller ET, Bhuvanesh N, McMillen CD, Stollenz M. Ethylene‐Bridged Tetradentate Bis(amidines): Supramolecular Assemblies through Hydrogen Bonding and Photoluminescence upon Deprotonation. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alvaro Calderón‐Díaz
- Department of Chemistry and Biochemistry Kennesaw State University 370 Paulding Avenue NW, MD1203 30144 Kennesaw GA USA
| | - Janet Arras
- Department of Chemistry and Biochemistry Kennesaw State University 370 Paulding Avenue NW, MD1203 30144 Kennesaw GA USA
| | - Ethan T. Miller
- Department of Chemistry and Biochemistry Kennesaw State University 370 Paulding Avenue NW, MD1203 30144 Kennesaw GA USA
| | - Nattamai Bhuvanesh
- Department of Chemistry Texas A&M University 580 Ross Street, P.O. Box 30012 77842‐3012 College Station TX USA
| | - Colin D. McMillen
- Department of Chemistry Clemson University 379 Hunter Laboratories 29634‐0973 Clemson SC USA
| | - Michael Stollenz
- Department of Chemistry and Biochemistry Kennesaw State University 370 Paulding Avenue NW, MD1203 30144 Kennesaw GA USA
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9
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Zhang Z, Hilche T, Slak D, Rietdijk NR, Oloyede UN, Flowers RA, Gansäuer A. Titanocenes as Photoredox Catalysts Using Green-Light Irradiation. Angew Chem Int Ed Engl 2020; 59:9355-9359. [PMID: 32216162 PMCID: PMC7317808 DOI: 10.1002/anie.202001508] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 03/08/2020] [Indexed: 11/16/2022]
Abstract
Irradiation of Cp2 TiCl2 with green light leads to electronically excited [Cp2 TiCl2 ]*. This complex constitutes an efficient photoredox catalyst for the reduction of epoxides and for 5-exo cyclizations of suitably unsaturated epoxides. To the best of our knowledge, our system is the first example of a molecular titanium photoredox catalyst.
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Affiliation(s)
- Zhenhua Zhang
- Kekulé-Institut für Organische Chemie und BiochemieUniversität BonnGerhard Domagk-Straße 153121BonnGermany
| | - Tobias Hilche
- Kekulé-Institut für Organische Chemie und BiochemieUniversität BonnGerhard Domagk-Straße 153121BonnGermany
| | - Daniel Slak
- Kekulé-Institut für Organische Chemie und BiochemieUniversität BonnGerhard Domagk-Straße 153121BonnGermany
| | - Niels R. Rietdijk
- Kekulé-Institut für Organische Chemie und BiochemieUniversität BonnGerhard Domagk-Straße 153121BonnGermany
| | | | | | - Andreas Gansäuer
- Kekulé-Institut für Organische Chemie und BiochemieUniversität BonnGerhard Domagk-Straße 153121BonnGermany
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10
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Yuan SF, Yan Y, Solan GA, Ma Y, Sun WH. Recent advancements in N-ligated group 4 molecular catalysts for the (co)polymerization of ethylene. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213254] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Zhang Z, Hilche T, Slak D, Rietdijk NR, Oloyede UN, Flowers RA, Gansäuer A. Titanocenes as Photoredox Catalysts Using Green‐Light Irradiation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001508] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Zhenhua Zhang
- Kekulé-Institut für Organische Chemie und Biochemie Universität Bonn Gerhard Domagk-Straße 1 53121 Bonn Germany
| | - Tobias Hilche
- Kekulé-Institut für Organische Chemie und Biochemie Universität Bonn Gerhard Domagk-Straße 1 53121 Bonn Germany
| | - Daniel Slak
- Kekulé-Institut für Organische Chemie und Biochemie Universität Bonn Gerhard Domagk-Straße 1 53121 Bonn Germany
| | - Niels R. Rietdijk
- Kekulé-Institut für Organische Chemie und Biochemie Universität Bonn Gerhard Domagk-Straße 1 53121 Bonn Germany
| | | | | | - Andreas Gansäuer
- Kekulé-Institut für Organische Chemie und Biochemie Universität Bonn Gerhard Domagk-Straße 1 53121 Bonn Germany
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12
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O'Dea C, Ugarte Trejo O, Arras J, Ehnbom A, Bhuvanesh N, Stollenz M. Ethylene-Bridged Hexadentate Bis(amidines) and Bis(amidinates) with Variable Binding Sites. J Org Chem 2019; 84:14217-14226. [PMID: 31560534 DOI: 10.1021/acs.joc.9b01908] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Hexadentate bis(amidines) form versatile networks of hydrogen bonds both in solid state and solution, as revealed by X-ray crystallography, IR, and NMR spectroscopy. Moreover, the corresponding bis(amidinates) produce blue and green emissions in THF solution. Tethered tetradentate bis(amidines) have emerged in coordination chemistry, enantioselective catalysis, as building blocks for polyfunctional heterocycles, and in photoluminescent materials. The next generation of flexible bis(amidine)/bis(amidinate) platforms with up to six N-donor sites has now been established.
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Affiliation(s)
- Connor O'Dea
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
| | - Omar Ugarte Trejo
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
| | - Janet Arras
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
| | - Andreas Ehnbom
- Department of Chemistry , Texas A&M University , 580 Ross Street , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A&M University , 580 Ross Street , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Michael Stollenz
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
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13
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Wang Y, Jian Y, Wu Y, Sun H, Zhang G, Zhang W, Gao Z. Organometallic titanocene complex as highly efficient bifunctional catalyst for intramolecular Mannich reaction. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Yunyun Wang
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710062 China
- College of Chemistry and Chemical EngineeringNingxia Normal University Guyuan 756000 People's Republic of China
| | - Yajun Jian
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710062 China
| | - Ya Wu
- College of Chemistry and Chemical EngineeringXi'an Shiyou University Xi'an 710065 People's Republic of China
| | - Huaming Sun
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710062 China
| | - Guofang Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710062 China
| | - Weiqiang Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710062 China
| | - Ziwei Gao
- Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710062 China
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14
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Bau MA, Wiesler S, Younas SL, Streuff J. Strategies for the Synthesis of Chiral Carbon-Bridged Group IV ansa-Metallocenes. Chemistry 2019; 25:10531-10545. [PMID: 31059590 DOI: 10.1002/chem.201901505] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Indexed: 12/13/2022]
Abstract
This minireview provides a survey of the various synthetic approaches to chiral ansa-metallocenes of Ti, Zr, and Hf containing a carbon-based bridge. The individual strategies to install substitution patterns at either the cyclopentadienyl framework or the bridging unit are highlighted with focus on the progress made towards a direct preparation of single complex stereoisomers. The review further includes the discussion of potential problems such as the formation of undesired diastereomers, the threat of racemization of enantiopure material, and synthetic challenges originating from the synthesis, purification, and isolation of the target complexes. The review has been written with the goal in mind to facilitate the design and synthesis of new chiral ansa-metallocene derivatives for emerging research areas in asymmetric catalysis and organometallic chemistry.
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Affiliation(s)
- Michael A Bau
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg im Breisgau, Germany
| | - Stefan Wiesler
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg im Breisgau, Germany
| | - Sara L Younas
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg im Breisgau, Germany
| | - Jan Streuff
- Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg im Breisgau, Germany
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15
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Bazarova ZB, Soroka LS, Lyapkov AA, Yusubov МS, Verpoort F. Synthesis of polydicyclopentadiene using the Cp 2TiCl 2/Et 2AlCl catalytic system and thin-layer oxidation of the polymer in air. Beilstein J Org Chem 2019; 15:733-745. [PMID: 30992721 PMCID: PMC6444398 DOI: 10.3762/bjoc.15.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 03/04/2019] [Indexed: 11/30/2022] Open
Abstract
The polymerization process of dicyclopentadiene using a multicomponent catalytic system based on bis(cyclopentadienyl)titanium dichloride and diethylaluminum chloride was studied. It was demonstrated that the application of an excess of the aluminum component leads to the formation of stable charged complexes of blue discoloration, which initiate cationic polymerization of dicyclopentadiene. Unstabilized thin layers of obtained polydicyclopentadiene undergo oxidation and structuring under atmospheric oxygen. Oxidation of polydicyclopentadiene films in air occurs slowly during several weeks and can be determined by the increase of carbonyl and hydroxyl adsorption bands in infrared spectra. Along with oxidation, cross-linking processes occur in polymers, which lead to a change in physical parameters of the layers, and more precisely to a decrease in the permeability of atmospheric oxygen through the layers. Consequently, this leads to the transition of the oxidation from a kinetic mode into a diffusive mode. Such structural changes do not occur in a polymer that was stabilized by adding an antioxidant.
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Affiliation(s)
- Zhargolma B Bazarova
- National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation
| | - Ludmila S Soroka
- National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation
| | - Alex A Lyapkov
- National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation
| | - Мekhman S Yusubov
- National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation
| | - Francis Verpoort
- National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation.,Laboratory of Organometallics, Catalysis and Ordered Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China.,College of Arts and Sciences, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, UAE.,Ghent University, Global Campus Songdo, 119 Songdomunhwa-Ro, Yeonsu-Gu, Incheon 406-840, South Korea
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16
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Wiesler S, Bau MA, Younas SL, Luu HT, Kratzert D, Streuff J. A Unified Approach to Customized Chiral Carbon-Bridged ansa
-Metallocenes. Chemistry 2018; 24:16532-16536. [DOI: 10.1002/chem.201804497] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Stefan Wiesler
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg Germany
| | - Michael A. Bau
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg Germany
| | - Sara L. Younas
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg Germany
| | - Hieu-Trinh Luu
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg Germany
| | - Daniel Kratzert
- Institut für Anorganische und Analytische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg Germany
| | - Jan Streuff
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg Germany
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17
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Kuhn A, Conradie J. Orbital control over the metal vs. ligand reduction in a series of neutral and cationic bis(cyclopentadienyl) Ti( iv) complexes. NEW J CHEM 2018. [DOI: 10.1039/c7nj03746e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
LUMO of a complex reveals the extent of the electronic influence of ligand substituents on the reduction centre of the complex.
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Affiliation(s)
- Annemarie Kuhn
- Department of Chemistry
- University of the Free State
- Bloemfontein
- South Africa
| | - Jeanet Conradie
- Department of Chemistry
- University of the Free State
- Bloemfontein
- South Africa
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18
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Yeung D, Penafiel J, Zijlstra HS, McIndoe JS. Oxidation of Titanocene(III): The Deceptive Simplicity of a Color Change. Inorg Chem 2017; 57:457-461. [DOI: 10.1021/acs.inorgchem.7b02705] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Darien Yeung
- Department of Chemistry, University of Victoria, PO Box 1700
STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Johanne Penafiel
- Department of Chemistry, University of Victoria, PO Box 1700
STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Harmen S. Zijlstra
- Department of Chemistry, University of Victoria, PO Box 1700
STN CSC, Victoria, BC V8W 2Y2, Canada
| | - J. Scott McIndoe
- Department of Chemistry, University of Victoria, PO Box 1700
STN CSC, Victoria, BC V8W 2Y2, Canada
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19
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Zhao R, Ma J, Zhang H, Huang J. Synthesis and Characterization of Constrained Geometry Oxygen and Sulphur Functionalized Cyclopentadienylchromium Complexes and Their Use in Catalysis for Olefin Polymerization. Molecules 2017; 22:molecules22050856. [PMID: 28531160 PMCID: PMC6154690 DOI: 10.3390/molecules22050856] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 05/08/2017] [Accepted: 05/15/2017] [Indexed: 11/18/2022] Open
Abstract
A series of constrained geometry O-functionalized cyclopentadienylchromium complexes (1–6) and a S-functionalized cyclopentadienylchromium complex (7) were first synthesized, characterized, and tested as catalyst precursors for the olefin polymerization. In the presence of MAO, the complexes exhibited high catalytic activity for the polymerization of ethylene. It is shown that ligand variations can have a substantial effect on catalyst activity and stability. The effect of Al/Cr ratio on catalytic activity was also studied.
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Affiliation(s)
- Ruiguo Zhao
- School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
- The Laboratory of Organometallic Chemistry, East China University of Science and Technology, Shanghai 200237, China.
| | - Jun Ma
- The Laboratory of Organometallic Chemistry, East China University of Science and Technology, Shanghai 200237, China.
| | - Hao Zhang
- School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
- The Laboratory of Organometallic Chemistry, East China University of Science and Technology, Shanghai 200237, China.
| | - Jiling Huang
- The Laboratory of Organometallic Chemistry, East China University of Science and Technology, Shanghai 200237, China.
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20
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Petrus R, Utko J, Lis T, Sobota P. Impact of Group 13 Metals on Cp2TiCl2 Reduction and Structural Characterization of Resulting Compounds. Inorg Chem 2017; 56:3324-3334. [DOI: 10.1021/acs.inorgchem.6b02824] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rafał Petrus
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
- Department of Chemistry, Wrocław University of Technology, 27 Wybrzeże Wyspiańskiego, 50-370 Wrocław, Poland
| | - Józef Utko
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Tadeusz Lis
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Piotr Sobota
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
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21
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Li W, Bai SD, Su F, Yuan SF, Duan XE, Liu DS. Zirconium complexes based on an ethylene linked amidinate–amido ligand: synthesis, characterization and ethylene polymerization. NEW J CHEM 2017. [DOI: 10.1039/c6nj02537d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monomer/dimer zirconium complexes 4–6 were synthesized by changing the molar ratio of ZrCl4 : ligand. The catalytic behaviors of these zirconium complexes were investigated in the presence of MAO as a cocatalys.
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Affiliation(s)
- Wei Li
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
- People's Republic of China
- Research Institute of Applied Chemistry
| | - Sheng-Di Bai
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- People's Republic of China
| | - Feng Su
- Department of Chemistry
- Changzhi University
- Changzhi 046011
- People's Republic of China
| | - Shi-Fang Yuan
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- People's Republic of China
| | - Xin-E Duan
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- People's Republic of China
| | - Dian-Sheng Liu
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- People's Republic of China
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22
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Vanadium(III)–catalyzed copolymerization of ethylene with norbornene: Microstructure at tetrad level and reactivity ratios. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.09.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Liu P, Liu W, Wang WJ, Li BG, Zhu S. A Comprehensive Review on Controlled Synthesis of Long-Chain Branched Polyolefins: Part 1, Single Catalyst Systems. MACROMOL REACT ENG 2016. [DOI: 10.1002/mren.201500053] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Pingwei Liu
- State Key Lab of Chemical Engineering; College of Chemical and Biological Engineering; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Weifeng Liu
- Department of Chemical Engineering; McMaster University; Hamilton Ontario L8S 4L7 Canada
| | - Wen-Jun Wang
- State Key Lab of Chemical Engineering; College of Chemical and Biological Engineering; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Bo-Geng Li
- State Key Lab of Chemical Engineering; College of Chemical and Biological Engineering; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Shiping Zhu
- Department of Chemical Engineering; McMaster University; Hamilton Ontario L8S 4L7 Canada
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24
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Mark S, Wadepohl H, Enders M. Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand-metal interactions. Beilstein J Org Chem 2016; 12:1372-9. [PMID: 27559387 PMCID: PMC4979879 DOI: 10.3762/bjoc.12.131] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 06/22/2016] [Indexed: 11/26/2022] Open
Abstract
A series of Cr(III) complexes based on quinoline-cyclopentadienyl ligands with additional hemilabile side arms were prepared and used as single-site catalyst precursors for ethylene polymerization. The additional donor functions interact with the metal centers only after activation with the co-catalyst. Evidence for this comes from DFT-calculations and from the differing behavior of the complexes in ethylene polymerization. All complexes investigated show very high catalytic activity and the additional side arm minimizes chain-transfer reactions, leading to increase of molecular weights of the resulting polymers.
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Affiliation(s)
- Stefan Mark
- Anorganisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Markus Enders
- Anorganisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
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25
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Li W, Su F, Yuan S, Duan X, Bai S, Liu D. Group IV compounds bearing a novel tridentate N-donor ligand: synthesis, structures and ethylene polymerization. RSC Adv 2016. [DOI: 10.1039/c6ra01365a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this paper, treatment of [PhN(CH2)3NC(Ph)NSiMe3]2Li4·2Et2O with group IV metal chlorides yields corresponding compounds 3–5. The catalytic behaviors of 3–5 were investigated in the presence of MAO as co-catalyst for ethylene polymerization.
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Affiliation(s)
- Wei Li
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Feng Su
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Shifang Yuan
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- China
| | - Xine Duan
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- China
| | - Shengdi Bai
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- China
| | - Diansheng Liu
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan
- China
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26
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Zhou Q, Liang H, Long Y, Wu Q, Gao H, Liang G, Zhu F. Syndiospecific polymerization of styrene with C1-symmetric [OSNO]-type bridged bis(phenolate) titanium (IV) complexes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.06.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Kuhn A, Conradie J. Observed hydrolysis of fluorine substituted bis(β-diketonato)-dichlorotitanium(IV) complexes. Dalton Trans 2015; 44:5106-13. [PMID: 25670035 DOI: 10.1039/c4dt02614d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel fluorine substituted mononuclear Ti(β-diketonato)2Cl2 complexes have been synthesised and shown to be involved in a partial hydrolysis reaction in solution, in which the hydrolyzed dinuclear {Ti(β-diketonato)2Cl}2(μ-O) is in equilibrium with the monomer. This is in contrast to the solution behaviour of the non CF3-containing Ti(CH3COCHCOCH3)2Cl2, Ti(PhCOCHCOCH3)2Cl2 and Ti(PhCOCHCOPh)2Cl2 complexes, under the same conditions. Variable temperature ((1)H and (19)F) NMR spectra and X-ray structure analyses reveal that the partially hydrolyzed dinuclear complex exists both in solution and in solid state, bridging through a single μ-oxo bridge and having one labile chloro-ligand per titanium center. Inclusion of electron-withdrawing CF3 groups into the already electron-deficient Ti complexes, led to the formation of {Ti(CF3COCHCOCF3)2Cl}2(μ-O) (dinuclear) and [Ti(CF3COCHCOCF3)2(μ-O)]4 (tetranuclear) complexes in CDCl3 containing trace amounts of water. DFT calculated free energies of hydrolysis support the existence of Ti(CH3COCHCOCH3)2Cl2 as a monomer and Ti(CF3COCHCOCF3)2Cl2 as a equilibrium mixture of the monomer and partially hydrolyzed dinuclear {Ti(β-diketonato)2Cl}2(μ-O) in CDCl3 solution.
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Affiliation(s)
- A Kuhn
- Department of Chemistry, University of the Free State, 9300 Bloemfontein, Republic of South Africa.
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28
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29
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Pinkas J, Lamač M. Transformations of functional groups attached to cyclopentadienyl or related ligands in group 4 metal complexes. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.03.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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30
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Šebestová L, Vinklárek J, Honzíček J, Růžičková Z, Řezáčová M. Synthesis, characterization and cytotoxic effect of vanadocene complexes bearing substituted 2,2′-bipyridines and 4,5-diazafluoren-9-one. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.12.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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Tuskaev VA, Gagieva SC, Kurmaev DA, Kolosov NA, Fedyanin IV, Bulychev BM. Titanium (IV) complexes stabilized by 2,6-bis-(α,α′-diphenyl(hydroxy)methyl)-pyridine: Catalytic activity in olefin polymerization and impact of lithium and magnesium chlorides. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.11.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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32
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Synthesis and carbonylation of oxotitanocyclobutanes derived from allene cycloaddition to a monomeric titanocene oxide. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.06.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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33
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Schejbal J, Honzíček J, Vinklárek J, Erben M, Růžičková Z. Acyl-Functionalized Molybdenum Compounds [(η3-C3H5)(η5-Cp′)Mo(CO)2]: An Experimental Study Including the X-ray Structure of a RareendoConformer. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402700] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Synthesis of substituted titanocene dichloride derivatives by hydrosilylation. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.06.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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35
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Zhao R, Liu T, Wang L, Ma H. High temperature ethylene polymerization catalyzed by titanium(IV) complexes with tetradentate aminophenolate ligands in cis-O, N, N chelating mode. Dalton Trans 2014; 43:12663-77. [PMID: 25010609 DOI: 10.1039/c4dt01122h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A series of titanium trichloride complexes , ligated with claw-type tetradentate aminophenolate ligands were synthesized from the direct reaction of TiCl4(THF)2 with 1 equiv. of the corresponding aminophenol in the presence of triethylamine. For comparison purposes, titanium isopropoxide complexes were also synthesized via the reaction of Ti(O(i)Pr)4 and 1 equiv. of the proligand. Similar reactions of ZrCl4(THF)2 with the corresponding aminophenol ligands in the presence of triethylamine only allowed the isolation of zirconium complex . The X-ray diffraction studies reveal that titanium trichloride complexes , and titanium triisopropoxide complex all possess a distorted octahedral geometry with the tetradentate aminophenolate ligand in cis-O, N, N chelating mode, where the methoxy group of the aryl unit does not coordinate with the metal center in the solid state. Upon activation with MMAO, these titanium and zirconium(iv) complexes exhibited moderate to high catalytic activities for ethylene polymerization at 30-120 °C, producing high-molecular-weight polyethylenes with broad distributions (Mw/Mn = 10.2-34.8). The activities of titanium trichloride complexes are significantly higher than those of titanium isopropoxide and zirconium trichloride complexes at high temperatures. The highest activity of 15 456 kg (mol-Ti h)(-1) could be achieved by titanium trichloride complex with bromo groups on both ortho- and para-positions of the phenolate ring of the ligand at 120 °C.
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Affiliation(s)
- Ruiguo Zhao
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China.
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36
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Gansäuer A, Okkel A, Schwach L, Wagner L, Selig A, Prokop A. Triazol-substituted titanocenes by strain-driven 1,3-dipolar cycloadditions. Beilstein J Org Chem 2014; 10:1630-7. [PMID: 25161720 PMCID: PMC4142980 DOI: 10.3762/bjoc.10.169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 06/27/2014] [Indexed: 11/23/2022] Open
Abstract
An operationally simple, convenient, and mild strategy for the synthesis of triazole-substituted titanocenes via strain-driven 1,3-dipolar cycloadditions between azide-functionalized titanocenes and cyclooctyne has been developed. It features the first synthesis of titanocenes containing azide groups. These compounds constitute ‘second-generation’ functionalized titanocene building blocks for further synthetic elaboration. Our synthesis is modular and large numbers of the complexes can in principle be prepared in short periods of time. Some of the triazole-substituted titanocenes display high cyctotoxic activity against BJAB cells. Comparison of the most active complexes allows the identification of structural features essential for biological activity.
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Affiliation(s)
- Andreas Gansäuer
- Kekulé-Institut für Organische Chemie und Biochemie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany
| | - Andreas Okkel
- Kekulé-Institut für Organische Chemie und Biochemie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany
| | - Lukas Schwach
- Kekulé-Institut für Organische Chemie und Biochemie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany
| | - Laura Wagner
- Medizinische Klinik für Hämatologie, Onkologie und Tumorimmunologie Campus Vichow Klinikum Charité Berlin, Augustenburger Platz 1, D-13353 Berlin, Germany
| | - Anja Selig
- Medizinische Klinik für Hämatologie, Onkologie und Tumorimmunologie Campus Vichow Klinikum Charité Berlin, Augustenburger Platz 1, D-13353 Berlin, Germany
| | - Aram Prokop
- Abteilung für Kinderonkologie /-hämatologie Kinderkrankenhaus der Stadt Köln Amsterdamerstrasse 59, D-50735 Köln, Germany
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37
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Li A, Xiao W, Ma H, Huang J. Ethylene polymerization with long-lifetime monopendant thienyl-substituted group 4 metallocenes. Appl Organomet Chem 2014. [DOI: 10.1002/aoc.3153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Aike Li
- Laboratory of Organometallic Chemistry; East China University of Science and Technology; Shanghai 200237 People's Republic of China
| | - Wei Xiao
- Laboratory of Organometallic Chemistry; East China University of Science and Technology; Shanghai 200237 People's Republic of China
| | - Haiyan Ma
- Laboratory of Organometallic Chemistry; East China University of Science and Technology; Shanghai 200237 People's Republic of China
| | - Jiling Huang
- Laboratory of Organometallic Chemistry; East China University of Science and Technology; Shanghai 200237 People's Republic of China
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38
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Huang W, Wang Y, Ma H, Huang J. Highly selective propylene dimerization catalyzed by
C
1
‐symmetric zirconocene complexes. Appl Organomet Chem 2014. [DOI: 10.1002/aoc.3142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Wenzhong Huang
- Laboratory of Organometallic ChemistryEast China University of Science and Technology Shanghai 200237 People's Republic of China
| | - Yan Wang
- Laboratory of Organometallic ChemistryEast China University of Science and Technology Shanghai 200237 People's Republic of China
| | - Haiyan Ma
- Laboratory of Organometallic ChemistryEast China University of Science and Technology Shanghai 200237 People's Republic of China
| | - Jiling Huang
- Laboratory of Organometallic ChemistryEast China University of Science and Technology Shanghai 200237 People's Republic of China
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39
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Wu X, Tamm M. Transition metal complexes supported by highly basic imidazolin-2-iminato and imidazolin-2-imine N-donor ligands. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.10.007] [Citation(s) in RCA: 128] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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40
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Zirconium complexes with pendant aryloxy groups attached to the metallocene moiety by ethyl or hexyl spacers. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.08.066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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41
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Substitution reactions of dichlorobis(betadiketonato-O,O′)titanium(IV) complexes with aryl diolato ligands: An experimental and computational study. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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42
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Márquez-Segovia I, Lara-Sánchez A, Otero A, Fernández-Baeza J, Castro-Osma JA, Sánchez-Barba LF, Rodríguez AM. Synthesis and structural characterization of amido scorpionate rare earth metals complexes. Dalton Trans 2014; 43:9586-95. [DOI: 10.1039/c4dt00770k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Sun Y, Chen H. Performance of Density Functionals for Activation Energies of Zr-Mediated Reactions. J Chem Theory Comput 2013; 9:4735-43. [DOI: 10.1021/ct400432x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yuanyuan Sun
- Beijing National
Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Photochemistry,
Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Hui Chen
- Beijing National
Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Photochemistry,
Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
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44
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Wang X, Peng W, Cui P, Leng X, Xia W, Chen Y. Synthesis and Catalytic Activity of Amido-Boratabenzene Complexes of Rare-Earth Metals and Zirconium and Chromium. Organometallics 2013. [DOI: 10.1021/om400893c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiufang Wang
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Weijie Peng
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Peng Cui
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Xuebing Leng
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Wei Xia
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Yaofeng Chen
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
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45
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Elkin T, Kulkarni NV, Tumanskii B, Botoshansky M, Shimon LJW, Eisen MS. Synthesis and Structure of Group 4 Symmetric Amidinate Complexes and Their Reactivity in the Polymerization of α-Olefins. Organometallics 2013. [DOI: 10.1021/om4006998] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tatyana Elkin
- Schulich
Faculty of Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Naveen V. Kulkarni
- Schulich
Faculty of Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Boris Tumanskii
- Schulich
Faculty of Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Mark Botoshansky
- Schulich
Faculty of Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Linda J. W. Shimon
- Department
of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Moris S. Eisen
- Schulich
Faculty of Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
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46
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Yasumoto T, Yamamoto K, Tsurugi H, Mashima K. Isospecific polymerization of 1-hexene by C1-symmetric half-metallocene dimethyl complexes of group 4 metals with bidentate N-substituted iminomethylpyrrolyl ligands. Dalton Trans 2013; 42:9120-8. [PMID: 23235804 DOI: 10.1039/c2dt32481d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Non-bridged half-metallocene dimethyl complexes of group 4 metals 2a-4a with an N-4-methoxyphenyl(iminomethyl)pyrrolyl ligand 1a were synthesized and characterized by NMR spectroscopy and X-ray analysis. Upon activation with [Ph3C][B(C6F5)4], these complexes became active catalysts for the polymerization of 1-hexene. A series of hafnium complexes with various N-substituents on the imine group of ligands 1b-1g were also prepared and applied as catalysts for 1-hexene polymerization. The activation parameters for the exchange process between the two methyl groups bound to the metal for Cp*MMe2(R-pyr) complexes were estimated by NMR shape analysis at various temperatures. The findings indicated that the transition state of the ligand flipping process might be associated with the isoselectivity of the polymerization reaction.
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Affiliation(s)
- Takahiro Yasumoto
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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47
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Geng W, Wang C, Guang J, Hao W, Zhang WX, Xi Z. 1,2,3,4-Tetrasubstituted cyclopentadienes and their applications for metallocenes: efficient synthesis through zirconocene- and CuCl-mediated intermolecular coupling of two alkynes and one diiodomethane. Chemistry 2013; 19:8657-64. [PMID: 23640905 DOI: 10.1002/chem.201300416] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 03/27/2013] [Indexed: 11/11/2022]
Abstract
1,2,3,4-Tetrasubstituted cyclopentadienes and indene derivatives with identical or different substituents were obtained in good to excellent isolated yields through a zirconocene- and CuCl-mediated intermolecular coupling process. This synthetic procedure involved three organic partners, including one CH2 I2 , and two different or identical alkynes. Two alkynes or one diyne undergo Cp2Zr(II)-mediated (Cp = η(5)-C5H5) pair-selective reductive coupling to afford the corresponding zirconacyclopentadiene derivatives, which react, in the presence of CuCl and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1 H)-pyrimidinone (DMPU), with CH2I2 through intermolecular followed by intramolecular coupling to afford the cyclopentadiene derivatives. An application of the prepared tetrasubstituted cyclopentadiene derivatives was demonstrated by the facile synthesis of the corresponding zirconocene complexes [((4R)Cp)2ZrCl2] and [((4R)Cp)2ZrR'2] (R' = Me, Et, or nBu). The unique 1,2,3,4-tetrasubstituted cyclopentadiene ligands and the corresponding metallocenes are expected to have further applications in organometallic chemistry and organic synthesis.
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Affiliation(s)
- Weizhi Geng
- Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry, Peking University, Beijing 100871, PR China
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48
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Otero A, Fernández-Baeza J, Lara-Sánchez A, Sánchez-Barba LF. Metal complexes with heteroscorpionate ligands based on the bis(pyrazol-1-yl)methane moiety: Catalytic chemistry. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.01.027] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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49
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Thiel I, Lamač M, Jiao H, Spannenberg A, Hapke M. Synthesis and Catalytic Activity of [Cp′Co(COD)] Complexes Bearing Pendant N-Containing Groups. Organometallics 2013. [DOI: 10.1021/om400330x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Indre Thiel
- Leibniz-Institut für
Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse
29a, 18059 Rostock, Germany
| | - Martin Lamač
- J. Heyrovský Institute
of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic,
Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
| | - Haijun Jiao
- Leibniz-Institut für
Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse
29a, 18059 Rostock, Germany
| | - Anke Spannenberg
- Leibniz-Institut für
Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse
29a, 18059 Rostock, Germany
| | - Marko Hapke
- Leibniz-Institut für
Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse
29a, 18059 Rostock, Germany
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50
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Tan X, Li B, Xu S, Song H, Wang B. Synthesis, Reactivities, and Catalytic Properties of Iodo-Bridged Polymeric Iridium Complexes with Flexible Carbon Chain-Bridged Bis(tetramethylcyclopentadienyl) Ligands. Organometallics 2013. [DOI: 10.1021/om4001742] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xing Tan
- State Key Laboratory
of Elemento-Organic
Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Bin Li
- State Key Laboratory
of Elemento-Organic
Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Shansheng Xu
- State Key Laboratory
of Elemento-Organic
Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Haibin Song
- State Key Laboratory
of Elemento-Organic
Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Baiquan Wang
- State Key Laboratory
of Elemento-Organic
Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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