1
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Lynch JR, Kennedy AR, Barker J, Mulvey RE. Modification of a Common β-diketiminate NacNac Framework via Sequential Lithiation and Small Molecule Insertion. Chemistry 2023:e202303373. [PMID: 38032346 DOI: 10.1002/chem.202303373] [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: 10/13/2023] [Revised: 11/23/2023] [Accepted: 11/30/2023] [Indexed: 12/01/2023]
Abstract
A widely utilised class of ligands in synthesis and catalysis, β-diketiminate (BDI) or NacNac compounds were initially considered innocent in the sense that they remained intact in all their applications. That changed when the γ-C-H unit of their NCCCN backbone was found to engage in reactions with electrophiles. Here, we show that this special reactivity can be used advantageously to prepare tripodal modifications of the common NacNac ligand derived from 2,6-diisopropylphenyl-β-methyldiketimine [NacNacH (Me, Dipp)]. Lithiation to give NacNacLi, followed by reactions with isocyanates, isothiocyanates and a carbodiimide, have afforded a series of tripodal NacNac variants having N,N,N,O; N,N,N,S; or N,N,N,N potential dentation sites, many of which have been crystallographically characterised. Distinct ligating modes of these new ligands have been elucidated through the crystal structures of their lithiated derivatives.
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Affiliation(s)
- Jennifer R Lynch
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Jim Barker
- Innospec Ltd., Oil Sites Road, Ellesmere Port, Cheshire, CH65 4EY, UK
| | - Robert E Mulvey
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
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2
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Skarjan L, Villegas‐Escobar N, Correa SA, Daniliuc CG, Matute RA, Rojas RS. Bulky and Electron‐Deficient α‐Iminocarboxamidato‐Nickel(II) Complexes: A Study of the Steric and Electronic Effects on Ethylene Activation. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Leon Skarjan
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 Heidelberg Germany
| | - Nery Villegas‐Escobar
- Centro Integrativo de Biología y Química Aplicada (CIBQA) Universidad Bernardo O'Higgins General Gana 1702 Santiago 8370854 Chile
| | - Sebastián A. Correa
- Departamento de Ciencias Químicas y Biológicas Universidad Bernardo O'Higgins General Gana 1702 Santiago Chile
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Ricardo A. Matute
- Centro Integrativo de Biología y Química Aplicada (CIBQA) Universidad Bernardo O'Higgins General Gana 1702 Santiago 8370854 Chile
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena California 91125 USA
| | - René S. Rojas
- Laboratorio de Química Inorgánica Facultad de Química y de Farmacia Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860 Casilla 306 Chile
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3
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Synthesis of highly branched oligoethylenes by air-stable N,N-indazole derivate methallyl Ni(II) complexes. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Gauld RM, McLellan R, Kennedy AR, Barker J, Reid J, Mulvey RE. Backbone Reactivity of Lithium β-Diketiminate (NacNac) Complexes with CO 2 , tBuNCO and iPrNCO. Chemistry 2019; 25:14728-14734. [PMID: 31574177 DOI: 10.1002/chem.201904013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 09/27/2019] [Indexed: 01/07/2023]
Abstract
Though alkali metal NacNac (β-diketiminate) complexes have been utilised in synthesis as NacNac-transfer agents, studies of them in their own right with small molecules are exceptionally rare. Here, the lithium compound of the common 2,6-diisopropylphenyl-β-methyldiketiminate [NacNac(Dipp, Me)] ligand is investigated with carbon dioxide and isocyanates. In all four cases reaction occurs at the backbone γ-C atom of the NacNac ligand, which redistributes electronically into a diimine. Insertion of CO2 gives an eight-atom carboxylate (Li2 O4 C2 ) ring at the γ-C site in a dimer. Insertion of tBuNCO gives a secondary amide at the γ-C site in a monomer with TMEDA chelating lithium. Double insertion of tBuNCO and (adventitious) oxygen gives a dimer with a (LiO)2 central core involving the latter source. Insertion of less bulky (iPrNCO) gives a dimer with dimerisation through the C=O bonds of the emergent secondary amide function.
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Affiliation(s)
- Richard M Gauld
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Ross McLellan
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Alan R Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Jim Barker
- Innospec Ltd, Innospec Manufacturing Park, Oil Sites Road, Ellesmere Port, Cheshire, CH65 4EY, UK
| | - Jacqueline Reid
- Innospec Ltd, Innospec Manufacturing Park, Oil Sites Road, Ellesmere Port, Cheshire, CH65 4EY, UK
| | - Robert E Mulvey
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
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5
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Correa SA, Daniliuc CG, Stark HS, Rojas RS. Nickel Catalysts Activated by rGO Modified with a Boron Lewis Acid To Produce rGO-Hyperbranched PE Nanocomposites. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00397] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sebastián A. Correa
- Laboratorio de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22 6094411, Chile
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelm-Universität, D-48149 Münster, Germany
| | - H. Sophia Stark
- Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraβe 4, D-85747 Garching, Germany
| | - René S. Rojas
- Laboratorio de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22 6094411, Chile
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6
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Beesam R, Nareddula DR. Pd and Ni complexes of a novel vinylidene β-diketimine ligand: Their application as catalysts in Heck coupling and alkyne trimerization. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3696] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Raghavendra Beesam
- Department of Chemistry; Pondicherry University; Pondicherry 605 014 India
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7
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Holtrichter-Rößmann T, Häger I, Daniliuc CG, Fröhlich R, Bergander K, Troll C, Rieger B, Rojas RS, Würthwein EU. Catalytically Active N-Acylamidine–Zirconium Complexes: Synthesis, Structures, and Application in Ethylene Polymerization. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00240] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thorsten Holtrichter-Rößmann
- Organisch-Chemisches
Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
- Chemtura Organometallics GmbH, Ernst Schering Straße 14, D-59192 Bergkamen, Germany
| | - Ina Häger
- Organisch-Chemisches
Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | | | - Roland Fröhlich
- Organisch-Chemisches
Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Klaus Bergander
- Organisch-Chemisches
Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Carsten Troll
- WACKER-Lehrstuhl
für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, D-85747 Garching, Germany
| | - Bernhard Rieger
- WACKER-Lehrstuhl
für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, D-85747 Garching, Germany
| | - René S. Rojas
- Departamento
de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22, Chile
| | - Ernst-Ulrich Würthwein
- Organisch-Chemisches
Institut der Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
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8
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The performance of methallyl nickel complexes and boron adducts in the catalytic activation of ethylene: a conceptual DFT perspective. J Mol Model 2015; 21:227. [PMID: 26267295 DOI: 10.1007/s00894-015-2770-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 07/20/2015] [Indexed: 10/23/2022]
Abstract
In this work, global and local descriptors of chemical reactivity and selectivity are used to explain the differences in reactivities toward ethylene of methallyl nickel complexes and their B(C6F5)3 and BF3 adducts. DFT calculations were used to explain why nickel complexes alone are inactive in ethylene polymerization while their boron adducts can activate it. It is shown that chemical potential, hardness, electrophilicity and molecular electrostatic potential surfaces describe fairly well the reactivity and selectivity of these organometallic systems toward ethylene. Experimental data indicates that addition of a borane molecule to nickel complexes changes dramatically their reactivity-behavior that is confirmed computationally. Our results show that bare complexes are unable to activate ethylene-a Lewis base-because they also behave as Lewis bases. The addition of the co-catalyst-a Lewis acid-turns the adducts into Lewis acids, making them active towards ethylene.
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9
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Molecular complexes of group 13 element trihalides, pentafluorophenyl derivatives and Lewis superacids. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.02.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Highly substituted zirconium and hafnium cyclopentadienyl bifunctional β-diketiminate complexes – Synthesis, structure, and catalytic activity towards ethylene polymerization. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.03.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Trofymchuk OS, Daniliuc CG, Kehr G, Erker G, Rojas RS. Synthesis and structures of N-arylcyano-β-diketiminate zinc complexes and adducts and their application in ring‐opening polymerization of l-lactide. RSC Adv 2015. [DOI: 10.1039/c4ra16670a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The coordination of B(C6F5)3 molecule close to the metal center in new zinc Nacnac complexes affects the ROP of l-LA.
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Affiliation(s)
- Oleksandra S. Trofymchuk
- Departamento de Quimica Inorganica
- Facultad de Quimica
- Pontificia Universidad Catolica de Chile
- Santiago-22
- Chile
| | | | - Gerald Kehr
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universitat
- D-48149 Münster
- Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universitat
- D-48149 Münster
- Germany
| | - Rene S. Rojas
- Departamento de Quimica Inorganica
- Facultad de Quimica
- Pontificia Universidad Catolica de Chile
- Santiago-22
- Chile
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12
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New half-sandwich zirconium(IV) complexes containing salicylaldimine ligands: Synthesis, characterizations and catalytic properties. Chem Res Chin Univ 2014. [DOI: 10.1007/s40242-014-4054-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Rajendran N, Reddy ND. Synthesis of a sulfonate substituted β-diketimine ligand and its complexes of Co(II), Ni(II), Zn(II) and Pd(II). Polyhedron 2014. [DOI: 10.1016/j.poly.2014.01.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Tang XY, Long YY, Wang YX, Liu JY, Li YS. Synthesis and characterization of phosphine-(thio)phenolate-based half-zirconocenes and their application in ethylene (co-)polymerization. Dalton Trans 2014; 43:222-30. [PMID: 24097353 DOI: 10.1039/c3dt51659h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of novel half-zirconocenes containing phosphine-(thio)phenolate chelating ligands of the type Cp'Zr(thf)Cl2[X-2-R(1)-4-R(2)-6-(PPh2)C6H2] (Cp' = C5Me5, 2a: X = O, R(1) = Ph, R(2) = H; 2b: X = O, R(1) = (t)Bu, R(2) = H; 2c: X = O, R(1) = R(2) = (t)Bu; 2d: X = O, R(1) = SiMe3, R(2) = H; 2e: X = S, R(1) = SiMe3, R(2) = H; Cp' = C5H5, 3b: X = O, R(1) = (t)Bu, R(2) = H; 3c: X = O, R(1) = R(2) = (t)Bu; 3d: X = O, R(1) = SiMe3, R(2) = H; 3e: X = S, R(1) = SiMe3, R(2) = H) have been synthesized in high yields (74-85%). These complexes were identified by (1)H, (13)C and (31)P NMR as well as elemental analyses. Structural analysis for 2a-b and 2d revealed that these complexes adopt six-coordinate, distorted octahedral geometry around the zirconium center. These novel half-zirconocenes possessed high catalytic performance for ethylene polymerization at high temperature in the presence of MMAO. The phosphine-phenolate-based Cp* complexes produced high molecular weight polymers (M(W) > 400,000), while the Cp analogues displayed much higher activities at high temperature. Complex 3c with MMAO showed a maximum ethylene polymerization activity of 17,580 kg mol(Zr)(-1) h(-1) at 75 °C. In addition, the Cp based complexes 3b-e could promote ethylene and 1-hexene copolymerization with high activities.
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Affiliation(s)
- Xiao-Yan Tang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
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15
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Trofymchuk OS, Gutsulyak DV, Quintero C, Parvez M, Daniliuc CG, Piers WE, Rojas RS. N-Arylcyano-β-diketiminate Methallyl Nickel Complexes: Synthesis, Adduct Formation, and Reactivity toward Ethylene. Organometallics 2013. [DOI: 10.1021/om400847b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Oleksandra S. Trofymchuk
- Departamento
de Quimica Inorganica, Facultad de Quimica, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago-22, Chile
| | - Dmitry V. Gutsulyak
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4,
| | - Celso Quintero
- Departamento
de Quimica Inorganica, Facultad de Quimica, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago-22, Chile
| | - Masood Parvez
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4,
| | - Constantin G. Daniliuc
- Organisch-chemisches Institut der Universitat Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Warren E. Piers
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4,
| | - Rene S. Rojas
- Departamento
de Quimica Inorganica, Facultad de Quimica, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago-22, Chile
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16
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El-Zoghbi I, Kebdani M, Whitehorne TJJ, Schaper F. Selective and Nonselective Aza-Michael Additions Catalyzed by a Chiral Zirconium Bis-Diketiminate Complex. Organometallics 2013. [DOI: 10.1021/om400544z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ibrahim El-Zoghbi
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Myriam Kebdani
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Todd J. J. Whitehorne
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, 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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17
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Facile hydroboration with the dimethylsulfide adducts of mono- and bis-(pentafluorophenyl)borane. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.07.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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El-Zoghbi I, Whitehorne TJJ, Schaper F. Exceptionally high lactide polymerization activity of zirconium complexes with bridged diketiminate ligands. Dalton Trans 2013; 42:9376-87. [DOI: 10.1039/c2dt31761c] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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19
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Liu K, Wu Q, Luo X, Gao W, Mu Y. Synthesis, characterization, and catalytic properties of new half-sandwich zirconium(IV) complexes. Dalton Trans 2012; 41:3461-7. [PMID: 22301768 DOI: 10.1039/c2dt12105k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A number of new half-sandwich zirconium(IV) complexes bearing N,N-dimethylaniline-amido ligands with the general formula Cp*ZrCl(2)[ortho-(RNCH(2))(Me(2)N)C(6)H(4)] [R = 2,6-Me(2)C(6)H(3) (1), 2,6-(i)Pr(2)C(6)H(3) (2), (i)Pr (3), (t)Bu (4)] were synthesized by the reaction of Cp*ZrCl(3) with the corresponding ortho-(Me(2)N)C(6)H(4)CH(2)NRLi. All new zirconium complexes were characterized by (1)H and (13)C NMR, elemental analyses and single crystal X-ray diffraction analysis. The molecular structural analysis reveals that the NMe(2) group does not coordinate to the zirconium atom in all cases. Complexes 1-4 all have a pseudo-tetrahedral coordination environment in their solid state structures and adopt a three-legged piano stool geometry for the zirconium atoms with the amide N atom and the two Cl atoms being the three legs and the Cp* ring being the seat. Variable-temperature (1)H NMR experiments for all complexes 1-4 were performed to investigate the possible intramolecular interaction between the N atom in the NMe(2) group and the central zirconium atom in solution. Upon activation with Al(i)Bu(3) and Ph(3)CB(C(6)F(5))(4), complexes 1-4 all exhibit moderate to good catalytic activity for ethylene polymerization and copolymerization with 1-hexene, producing linear polyethylene or poly(ethylene-co-1-hexene) with moderate molecular weight and reasonable 1-hexene incorporation.
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Affiliation(s)
- Kefeng Liu
- State Key Laboratory for Supramolecular Structure and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
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20
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Nickel pre-catalysts bearing [(N)-imidoylamidine] ligands; influence of the presence of pyridine and pentafluorophenyl groups in ligand backbone on the reactivity in ethylene polymerizations. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2011.11.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Chisholm MH, Choojun K, Gallucci JC, Wambua PM. Chemistry of magnesium alkyls supported by 1,5,9-trimesityldipyrromethene and 2-[(2,6-diisopropylphenyl)amino]-4-[(2,6-diisopropylphenyl)imino]pent-2-ene. A comparative study. Chem Sci 2012. [DOI: 10.1039/c2sc21017g] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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22
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Rojas RS, Cabrera AR, Peoples BC, Spannhoff K, Valderrama M, Fröhlich R, Kehr G, Erker G. Synthesis of [(π-cyano-P-nacnac)Cp] and [(π-cyano-nacnac)Cp]-zirconium complexes, and their remote activation for ethylene polymerization. Dalton Trans 2012; 41:1243-51. [DOI: 10.1039/c1dt11261a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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23
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Rojas RS, Peoples BC, Cabrera AR, Valderrama M, Fröhlich R, Kehr G, Erker G, Wiegand T, Eckert H. Synthesis and Structure of Bifunctional Zirconocene/Borane Complexes and Their Activation for Ethylene Polymerization. Organometallics 2011. [DOI: 10.1021/om200536z] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Rene S. Rojas
- Departamento de Quı́mica
Inorgánica, Facultad
de Quı́mica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
| | - Brian C. Peoples
- Departamento de Quı́mica
Inorgánica, Facultad
de Quı́mica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
| | - Alan R. Cabrera
- Departamento de Quı́mica
Inorgánica, Facultad
de Quı́mica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
| | - Mauricio Valderrama
- Departamento de Quı́mica
Inorgánica, Facultad
de Quı́mica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
| | - Roland Fröhlich
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, D-48149 Münster,
Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, D-48149 Münster,
Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, D-48149 Münster,
Germany
| | - Thomas Wiegand
- Institut für Physikalische Chemie and Graduate School
of Chemistry, Universität Münster, Corrensstrasse
28/30, D-48149 Münster, Germany
| | - Hellmut Eckert
- Institut für Physikalische Chemie and Graduate School
of Chemistry, Universität Münster, Corrensstrasse
28/30, D-48149 Münster, Germany
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24
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Liu K, Wu Q, Gao W, Mu Y. Half-zirconocene anilide complexes: synthesis, characterization and catalytic properties for ethylene polymerization and copolymerization with 1-hexene. Dalton Trans 2011; 40:4715-21. [PMID: 21431112 DOI: 10.1039/c0dt01789b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A number of half-zirconocene anilide complexes of the type Cp*ZrCl(2)[N(2,6-R(1)(2)C(6)H(3))R(2)] [R(1) = (i)Pr (1, 3), Me (2); R(2) = Me (1, 2), Bn (3)] and Cp*ZrCl[N(2,6-Me(2)C(6)H(3))Me](2) (4) (Cp* = pentamethylcyclopentadienyl) were synthesized from the reactions of Cp*ZrCl(3) with the lithium salts of the corresponding anilide in diethyl ether at room temperature. All new zirconium complexes were characterized by (1)H and (13)C NMR and elemental analysis. Molecular structures of complexes 1, 2 and 4 were determined by single crystal X-ray diffraction analysis. Upon activation with Al(i)Bu(3) and Ph(3)CB(C(6)F(5))(4), complexes 1-4 exhibit good catalytic activity for ethylene polymerization, and produce polyethylene with a moderate molecular weight. Among these zirconium complexes, complex 1 shows the highest catalytic activity while complex 4 shows the lowest catalytic activity for ethylene polymerization. Complexes 1-3 also exhibit moderate catalytic activity for copolymerization of ethylene with 1-hexene, and produce copolymers with relatively high molecular weight and reasonable 1-hexene incorporation. In addition, the activation procedure of these catalyst systems were studied by (1)H NMR spectroscopy.
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Affiliation(s)
- Kefeng Liu
- State Key Laboratory for Supramolecular Structure and Materials, School of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
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Spannhoff K, Rojas R, Fröhlich R, Kehr G, Erker G. Reactions of Topologically Related “nacnacH-CN” and “P-nacnacH-CN” Chelate Ligand Systems with HB(C6F5)2. Organometallics 2011. [DOI: 10.1021/om200116q] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kirsten Spannhoff
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Rene Rojas
- Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22, Chile
| | - Roland Fröhlich
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
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