1
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Diaz C, Fu J, Soobrattee S, Cao L, Nyamayaro K, Goonesinghe C, Patrick BO, Mehrkhodavandi P. Comparison of Imine- and Phosphinimine-Supported Indium Complexes: Tuning the Reactivity for the Sequential and Simultaneous Copolymerization of Lactide and ε-Caprolactone. Inorg Chem 2022; 61:3763-3773. [PMID: 35171588 DOI: 10.1021/acs.inorgchem.2c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Imine- and phosphinimine-supported indium complexes were used as catalysts in the polymerization of racemic lactide and ε-caprolactone as well as their copolymerization by the sequential and simultaneous addition of monomers. Tuning the electronics and sterics of the indium centers by either (i) changing the nature of the nitrogen donors and (ii) coordinating a hemilabile side group had a significant effect on the reactivity of the complexes, their stability, and their control in the synthesis of block copolymers. Specifically, the imine-supported complex (5) showed the highest activity in the homo- and copolymerization of the cyclic esters, in contrast to the phosphinimine-supported complex (7), which was significantly slower and less stable. The presence of morpholine and thiomorpholine hemilabile side groups either reduced the activity or prevented the formation of alkoxide complexes.
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Affiliation(s)
- Carlos Diaz
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Jane Fu
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Shazia Soobrattee
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Lirong Cao
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Kudzanai Nyamayaro
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Chatura Goonesinghe
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Brian O Patrick
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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2
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Sarkar N, Sahoo RK, Mukhopadhyay S, Nembenna S. Organoaluminum Cation Catalyzed Selective Hydrosilylation of Carbonyls, Alkenes, and Alkyne. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101030] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nabin Sarkar
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Rajata Kumar Sahoo
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Sayantan Mukhopadhyay
- National Institute of Science Education and Research School of Chemical Sciences SCS NISERbhubaneswar 752050 bhubaneswar INDIA
| | - Sharanappa Nembenna
- National Institute of Science Education and Research (NISER) School of Chemical Sciences Jatni CampusNISER, BhubaneswarINDIA 752050 Bhubaneswar INDIA
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3
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Cationic aluminum complexes supported on tridentate O,N,O platform and activity studies in the ring opening polymerization of ε-caprolactone. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Bolley A, Specklin D, Dagorne S. NHC-stabilized Al(III) and Ga(III) cationic alkyls: Synthesis, structure and use in hydrosilylation catalysis. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Podhorsky J, Babiak M, Pinkas J, Hegemann C, Mathur S, Moravec Z. New mixed-ligand organoaluminum heteroarylalkenolates. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Jung HJ, Cho Y, Kim D, Mehrkhodavandi P. Cationic aluminum, gallium, and indium complexes in catalysis. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01741h] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The introduction of cationic charge allows cationic group 13 complexes to be excellent Lewis acid catalysts. Cationic aluminum, gallium, and indium complexes in catalysis are comprehensively reviewed based on the reaction type.
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Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Youngjung Cho
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Diana Kim
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
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7
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Goonesinghe C, Roshandel H, Diaz C, Jung HJ, Nyamayaro K, Ezhova M, Mehrkhodavandi P. Cationic indium catalysts for ring opening polymerization: tuning reactivity with hemilabile ligands. Chem Sci 2020; 11:6485-6491. [PMID: 34094114 PMCID: PMC8159295 DOI: 10.1039/d0sc01291b] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
This is a comprehensive study of the effects of rationally designed hemilabile ligands on the stability, reactivity, and change in catalytic behavior of indium complexes. We report cationic alkyl indium complexes supported by a family of hemi-salen type ligands bearing hemilabile thiophenyl (2a), furfuryl (2b) and pyridyl (2c) pendant donor arms. Shelf-life and stability of these complexes followed the trend 2a < 2b < 2c, showing direct correlation to the affinity of the pendant donor group to the indium center. Reactivity towards polymerization of epichlorohydrin and cyclohexene oxide followed the trend 2a > 2b > 2c with control of polymerization following an inverse relationship to reactivity. Surprisingly, 2c polymerized racemic lactide without an external initiator, likely through an alkyl-initiated coordination-insertion mechanism.
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Affiliation(s)
| | - Hootan Roshandel
- Department of Chemistry, University of British Columbia Vancouver BC Canada
| | - Carlos Diaz
- Department of Chemistry, University of British Columbia Vancouver BC Canada
| | - Hyuk-Joon Jung
- Department of Chemistry, University of British Columbia Vancouver BC Canada
| | - Kudzanai Nyamayaro
- Department of Chemistry, University of British Columbia Vancouver BC Canada
| | - Maria Ezhova
- Department of Chemistry, University of British Columbia Vancouver BC Canada
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8
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Santulli F, D’Auria I, Boggioni L, Losio S, Proverbio M, Costabile C, Mazzeo M. Bimetallic Aluminum Complexes Bearing Binaphthyl-Based Iminophenolate Ligands as Catalysts for the Synthesis of Polyesters. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00016] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Federica Santulli
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
| | - Ilaria D’Auria
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
| | | | - Simona Losio
- SCITEC-CNR, Via E. Bassini 15, 20133 Milano, Italy
| | | | - Chiara Costabile
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
| | - Mina Mazzeo
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
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9
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Dodonov VA, Morozov AG, Rumyantsev RV, Fukin GK, Skatova AA, Roesky PW, Fedushkin IL. Synthesis and ε-Caprolactone Polymerization Activity of Electron-Deficient Gallium and Aluminum Species Containing a Charged Redox-Active dpp-Bian Ligand. Inorg Chem 2019; 58:16559-16573. [DOI: 10.1021/acs.inorgchem.9b02592] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Vladimir A. Dodonov
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, Nizhny Novgorod 603950, Russian Federation
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstraße 15, Karlsruhe 76131, Germany
| | - Alexander G. Morozov
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, Nizhny Novgorod 603950, Russian Federation
| | - Roman V. Rumyantsev
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, Nizhny Novgorod 603950, Russian Federation
| | - Georgy K. Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, Nizhny Novgorod 603950, Russian Federation
| | - Alexandra A. Skatova
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, Nizhny Novgorod 603950, Russian Federation
| | - Peter W. Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstraße 15, Karlsruhe 76131, Germany
| | - Igor L. Fedushkin
- G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, Nizhny Novgorod 603950, Russian Federation
- College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China
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10
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Andrea KA, Plommer H, Kerton FM. Ring-opening polymerizations and copolymerizations of epoxides using aluminum- and boron-centered catalysts. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.08.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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11
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Lu WY, Chang YC, Lian CJ, Wu KH, Chiang MY, Chen HY, Lin CC, Ko BT. Optimization of six-membered ring aluminum complexes in ε-caprolactone polymerization. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.02.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Plommer H, Murphy JN, Dawe LN, Kerton FM. Morpholine-Stabilized Cationic Aluminum Complexes and Their Reactivity in Ring-Opening Polymerization of ε-Caprolactone. Inorg Chem 2019; 58:5253-5264. [DOI: 10.1021/acs.inorgchem.9b00347] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Hart Plommer
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X7, Canada
| | - Jennifer N. Murphy
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X7, Canada
| | - Louise N. Dawe
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - Francesca M. Kerton
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X7, Canada
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13
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Diaz C, Ebrahimi T, Mehrkhodavandi P. Cationic indium complexes for the copolymerization of functionalized epoxides with cyclic ethers and lactide. Chem Commun (Camb) 2019; 55:3347-3350. [PMID: 30815641 DOI: 10.1039/c8cc08858f] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We report the first example of discrete cationic indium complexes for the copolymerization of epoxides, cyclic ethers, and lactide. [SalenIn][SbF6] in particular proved to be a highly active catalyst for the homo-polymerization of functionalized epoxides and their copolymerization with other cyclic ethers THF, oxetane and oxepane. This catalyst also proved competent in the polymerization of epichlorohydrin and lactide, forming copolymers with good activity and control. Investigation of the role of counteranions and solvent donors on the kinetics of polymerization of epoxides revealed a subtle effect of solvents on initiation rates.
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Affiliation(s)
- Carlos Diaz
- University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver, BC, Canada.
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14
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Franz D, Inoue S. Cationic Complexes of Boron and Aluminum: An Early 21st Century Viewpoint. Chemistry 2018; 25:2898-2926. [PMID: 30113744 DOI: 10.1002/chem.201803370] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Indexed: 01/03/2023]
Abstract
Boron and aluminum are lighter Group 13 elements, found in daily life commodities, and considered environmentally benign. Nevertheless, they markedly differ in their elemental properties (e.g., metal character, atomic radius). The use of Lewis acidic complexes of boron and aluminum for methods of bond activation and catalysis (e.g., hydrogenation of unsaturated substrates, polymerization of olefins and epoxides) is quickly expanding. The introduction of cationic charge may boost the metalloid-centered Lewis acidity and allow for its fine-tuning particularly with regard to preference for "hard" or "soft" Lewis bases (i.e., substrates). Especially the isolation of low-coordinate cations (number of ligand atoms smaller than four) demands elaborate techniques of thermodynamic and kinetic stabilization (i.e., electronic saturation and steric shielding) by a ligand system. Furthermore, the properties of the solvent and the counteranion must be considered with care. Here, selected examples of boron and aluminum cations are described.
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Affiliation(s)
- Daniel Franz
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748, Garching bei München, Germany
| | - Shigeyoshi Inoue
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748, Garching bei München, Germany
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15
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Aluminum Complexes Based on Tridentate Amidoalkoxide NNO-Ligands: Synthesis, Structure, and Properties. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.08.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Schmitz LA, McCollum AM, Rheingold AL, Green DB, Fritsch JM. Synthesis and structures of aluminum ion-pair complexes that act as L- and racemic-lactide ring opening polymerization initiators. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.03.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Muñoz MT, Palenzuela M, Cuenca T, Mosquera MEG. Aluminum Aryloxide Compounds as Very Active Catalysts for Glycidyl Methacrylate Selective Ring-Opening Polymerization. ChemCatChem 2018. [DOI: 10.1002/cctc.201701377] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. Teresa Muñoz
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río”; Universidad de Alcalá; Campus Universitario E-28871 Alcalá de Henares Spain
| | - Miguel Palenzuela
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río”; Universidad de Alcalá; Campus Universitario E-28871 Alcalá de Henares Spain
| | - Tomás Cuenca
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río”; Universidad de Alcalá; Campus Universitario E-28871 Alcalá de Henares Spain
| | - Marta E. G. Mosquera
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río”; Universidad de Alcalá; Campus Universitario E-28871 Alcalá de Henares Spain
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18
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Kiriratnikom J, Chotchatchawankul S, Haesuwannakij S, Kiatisevi S, Phomphrai K. Synthesis and characterization of neutral and cationic aluminum complexes supported by a furfuryl-containing aminophenolate ligand for ring-opening polymerization of ε-caprolactone. NEW J CHEM 2018. [DOI: 10.1039/c8nj00937f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mononuclear aluminum complexes supported by novel furfuryl-containing aminophenolate ligand are reported along with CL polymerization.
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Affiliation(s)
| | - Sucheewin Chotchatchawankul
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong
- Thailand
| | - Setsiri Haesuwannakij
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong
- Thailand
| | | | - Khamphee Phomphrai
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong
- Thailand
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19
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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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20
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Mukherjee D, Spaniol TP, Okuda J. Unexpected alkane elimination from cationic group 13 dialkyls in a reaction with a macrocyclic polyamine. Dalton Trans 2017; 46:651-655. [DOI: 10.1039/c6dt04379h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A macrocyclic polyamine 1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane, (Me3TACD)H formed thermally stable adducts with MR3 (M = Al, In) but released RH from reactions with [MR2]+.
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Affiliation(s)
| | | | - Jun Okuda
- Institute of Inorganic Chemistry
- RWTH Aachen University
- Aachen
- Germany
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21
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Schnee G, Bolley A, Gourlaouen C, Welter R, Dagorne S. Synthesis and structural characterization of NHC-stabilized Al(III) and Ga(III) alkyl cations and use in the ring-opening polymerization of lactide. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.07.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Aluminum complexes with benzoxazolphenolate ligands: Synthesis, characterization and catalytic properties for ring-opening polymerization of cyclic esters. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.03.042] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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23
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Li W, Ouyang H, Chen L, Yuan D, Zhang Y, Yao Y. A Comparative Study on Dinuclear and Mononuclear Aluminum Methyl Complexes Bearing Piperidyl–Phenolato Ligands in ROP of Epoxides. Inorg Chem 2016; 55:6520-4. [PMID: 27322514 DOI: 10.1021/acs.inorgchem.6b00639] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wenyi Li
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People’s Republic of China
- Department
of Chemistry and Biological Engineering, Hunan University of Science and Engineering, Yongzhou 425199, Hunan, People’s Republic of China
| | - Hao Ouyang
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Lijuan Chen
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Dan Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Yong Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Yingming Yao
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People’s Republic of China
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24
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Devaine-Pressing K, Lehr JH, Pratt ME, Dawe LN, Sarjeant AA, Kozak CM. Magnesium amino-bis(phenolato) complexes for the ring-opening polymerization of rac-lactide. Dalton Trans 2016; 44:12365-75. [PMID: 25805063 DOI: 10.1039/c5dt00236b] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnesium compounds of tetradentate amino-bis(phenolato) ligands, Mg[L1] (1) and Mg[L2] (2) (where [L1] = 2-pyridyl-N,N-bis(2-methylene-4-methoxy-6-tert-butylphenolato), and [L2] = dimethylaminoethylamino-N,N-bis(2-methylene-4-methyl-6-tert-butylphenolato)) were prepared. The proligands, H2[L1] and H2[L2] were reacted with di(n-butyl)magnesium in toluene to give the desired compounds in high yields. Compounds 1 and 2 exhibit dimeric structures in solutions of non-coordinating solvents as observed by NMR spectroscopy and in the solid state as shown by the single crystal X-ray structure of 2. These compounds exhibit good activity for rac-lactide polymerization in solution and in molten lactide.
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Affiliation(s)
- Katalin Devaine-Pressing
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X7.
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25
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Wang X, Dorcet V, Luo Y, Carpentier JF, Kirillov E. Synthesis and structure of the first discrete dinuclear cationic aluminum complexes. Dalton Trans 2016; 45:12346-51. [DOI: 10.1039/c6dt02360f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The preparation of discrete mono- and dicationic dinuclear aluminum complexes from the parent charge neutral dinuclear precursors has been studied. The first crystal structure of a dicationic dialuminum complex is reported.
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Affiliation(s)
- Xingbao Wang
- Institut des Sciences Chimiques de Rennes
- Organometallics: Materials and Catalysis laboratories
- UMR 6226 CNRS-Université de Rennes 1
- F-35042 Rennes Cedex
- France
| | - Vincent Dorcet
- Institut des Sciences Chimiques de Rennes
- Centre de diffraction X
- UMR 6226 CNRS-Université de Rennes 1
- F-35042 Rennes Cedex
- France
| | - Yi Luo
- State Key Laboratory of Fine Chemicals
- School of Pharmaceutical Science and Technology Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Jean-Francois Carpentier
- Institut des Sciences Chimiques de Rennes
- Organometallics: Materials and Catalysis laboratories
- UMR 6226 CNRS-Université de Rennes 1
- F-35042 Rennes Cedex
- France
| | - Evgueni Kirillov
- Institut des Sciences Chimiques de Rennes
- Organometallics: Materials and Catalysis laboratories
- UMR 6226 CNRS-Université de Rennes 1
- F-35042 Rennes Cedex
- France
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26
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Hu TC, Wu MC, Wu SS, Hu CH, Lin CH, Datta A, Lin TH, Huang JH. Synthesis, characterization and reactivity study of aluminum compounds incorporating bi- and tri-dentate pyrrole–piperazine ligands. RSC Adv 2016. [DOI: 10.1039/c6ra01694d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of Al derivatives are afforded incorporating substituted bi- and tri-dentate pyrrole–piperazine precursors. The reactivity with small organic molecules and the associated mechanistic details are also reported.
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Affiliation(s)
- Ting-Chia Hu
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
| | - Ming-Chun Wu
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
| | - Shih-Sheng Wu
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
| | - Ching-Han Hu
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
| | - Chia-Her Lin
- Department of Chemistry
- Chung-Yuan Christian University
- Chun-Li 320
- Taiwan
| | - Amitabha Datta
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
| | - Tzung-Han Lin
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
| | - Jui-Hsien Huang
- Department of Chemistry
- National Changhua University of Education
- Changhua
- Taiwan 50058
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27
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Methoxyaryl substituted aluminum ketiminate complexes and its activity in ring opening polymerization processes. INORG CHEM COMMUN 2015. [DOI: 10.1016/j.inoche.2015.03.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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28
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Sarazin Y, Carpentier JF. Discrete Cationic Complexes for Ring-Opening Polymerization Catalysis of Cyclic Esters and Epoxides. Chem Rev 2015; 115:3564-614. [DOI: 10.1021/acs.chemrev.5b00033] [Citation(s) in RCA: 211] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yann Sarazin
- Institut des Sciences Chimiques
de Rennes, Organometallics, Materials and Catalysis Laboratories,
UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Jean-François Carpentier
- Institut des Sciences Chimiques
de Rennes, Organometallics, Materials and Catalysis Laboratories,
UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
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29
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Plommer H, Reim I, Kerton FM. Ring-opening polymerization of cyclohexene oxide using aluminum amine–phenolate complexes. Dalton Trans 2015; 44:12098-102. [DOI: 10.1039/c5dt00220f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Al(iii) catalysts at concentrations as low as 0.001% ring-open cyclohexene oxide to yield high molecular weight polyether with narrow dispersity.
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Affiliation(s)
- Hart Plommer
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada
| | - Immanuel Reim
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada
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30
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Nakata N, Saito Y, Ishii A. Neutral Methyl and Cationic Aluminum Complexes Supported by a trans-1,2-Cyclooctanediyl-Bridged [OSSO]-Type Bis(phenolato) Ligand: Synthesis, Structures, and Use in Catalysis for Propylene Oxide Polymerization. Organometallics 2014. [DOI: 10.1021/om5001698] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Norio Nakata
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo,
Sakura-ku, Saitama 338-8570, Japan
| | - Yusuke Saito
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo,
Sakura-ku, Saitama 338-8570, Japan
| | - Akihiko Ishii
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo,
Sakura-ku, Saitama 338-8570, Japan
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31
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32
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Saunders LN, Dawe LN, Kozak CM. Alkali metal complexes of tridentate amine-bis(phenolate) ligands and their rac-lactide ROP activity. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.09.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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33
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Liang L, Lin S, Chien C. Aluminum Complexes of Tridentate Amine Biphenolate Ligands Containing Distinct
N
‐alkyls: Synthesis and Catalytic Ring‐opening Polymerization. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201200559] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lan‐Chang Liang
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat‐sen University, Kaohsiung 80424, Taiwan
| | - Sheng‐Ta Lin
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat‐sen University, Kaohsiung 80424, Taiwan
| | - Chia‐Cheng Chien
- Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat‐sen University, Kaohsiung 80424, Taiwan
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34
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Roşca SC, Roşca DA, Dorcet V, Kozak CM, Kerton FM, Carpentier JF, Sarazin Y. Alkali aminoether-phenolate complexes: synthesis, structural characterization and evidence for an activated monomer ROP mechanism. Dalton Trans 2013; 42:9361-75. [PMID: 23334495 DOI: 10.1039/c2dt32726k] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several monometallic {LO(i)}M complexes of lithium (M = Li; i = 1 (1), 2 (2), 3 (3)) or potassium (M = K, i = 3 (4)) and the heteroleptic bimetallic lithium complex {LO(3)}Li·LiN(SiMe2H)2 (5), all supported by monoanionic aminoether-phenolate {LO(i)}(-) (i = 1-3) ligands, have been synthesized and structurally characterized. A large range of coordination motifs is represented in the solid state, depending on the chelating ability of the ligand, the size of the metal and the number of metallic centres found in the complex. Pulse-gradient spin-echo NMR showed that 1-4 are monomeric in solution, irrespective of their (mono- or di)nuclearity in the solid-state. VT (7)Li and DOSY NMR measurements conducted for 5 indicated that the two Li atoms in the complex do not exchange positions even at 80 °C. Upon addition of 1-10 equiv. of BnOH, the electron-rich and sterically congested {LO(3)}Li complex (3) promotes the controlled living and immortal ring-opening polymerisation of L-lactide. The combination of polymer end-group analyses and stoichiometric model reactions unambiguously provided evidence that ROP reactions catalyzed by these two-component {LO(i)}Li/BnOH catalyst systems operate according to an activated monomer mechanism, and not via the coordination-insertion scenario frequently assumed for similar alkali phenolate-alcohol systems.
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Affiliation(s)
- Sorin-Claudiu Roşca
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, 263 avenue du Général Leclerc, 35042 Cedex, Rennes, France
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35
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Hild F, Neehaul N, Bier F, Wirsum M, Gourlaouen C, Dagorne S. Synthesis and Structural Characterization of Various N,O,N-Chelated Aluminum and Gallium Complexes for the Efficient ROP of Cyclic Esters and Carbonates: How Do Aluminum and Gallium Derivatives Compare ? Organometallics 2013. [DOI: 10.1021/om3011068] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Frédéric Hild
- Institut
de Chimie de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise
Pascal, 67000 Strasbourg, France
| | - Nirvana Neehaul
- Institut
de Chimie de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise
Pascal, 67000 Strasbourg, France
| | - Frédéric Bier
- Institut
de Chimie de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise
Pascal, 67000 Strasbourg, France
| | - Morgane Wirsum
- Institut
de Chimie de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise
Pascal, 67000 Strasbourg, France
| | - Christophe Gourlaouen
- Laboratoire de Chimie Quantique, Institut de Chimie
de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Samuel Dagorne
- Institut
de Chimie de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise
Pascal, 67000 Strasbourg, France
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36
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Dean RK, Reckling AM, Chen H, Dawe LN, Schneider CM, Kozak CM. Ring-opening polymerization of cyclic esters with lithium amine-bis(phenolate) complexes. Dalton Trans 2013; 42:3504-20. [PMID: 23280340 DOI: 10.1039/c2dt32682e] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lithium compounds of tetradentate amino-bis(phenolato)-tetrahydrofuranyl ligands, Li(2)[L1] (1) and Li(2)[L2] (2) (where [L1] = 2-tetrahydrofuranyl-N,N-bis(2-methylene-4-methyl-6-tert-butylphenolate), and [L2] = 2-tetrahydrofuranyl-N,N-bis(2-methylene-4,6-tert-butylphenolate)) were characterized by multinuclear solution NMR and solid-state (6)Li and (7)Li NMR spectroscopy. The proligands, n-propylamino-N,N-bis(2-methylene-4-methyl-6-tert-butylphenol), (H(2)[L3]) and benzylamino-N,N-bis(2-methylene-4,6-di-tert-amylphenol), H(2)[L4] were reacted with n-butyllithium in THF to give the related dilithium compounds Li(2)[L3] (4) and Li(2)[L4] (5), respectively. The pyridine adduct of 1, (py)(2)Li(2)[L1] (3) and complexes 4 and 5 have been structurally characterized by single-crystal X-ray diffraction and NMR spectroscopy. The reactivity of these complexes for the ring-opening polymerization of rac-lactide, as well as the influences of monomer concentration, monomer/Li molar ratio, polymerization temperature and time, were studied.
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Affiliation(s)
- Rebecca K Dean
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada
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37
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Ikpo N, Flogeras JC, Kerton FM. Aluminium coordination complexes in copolymerization reactions of carbon dioxide and epoxides. Dalton Trans 2013; 42:8998-9006. [DOI: 10.1039/c3dt00049d] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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38
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Ikpo N, Barbon SM, Drover MW, Dawe LN, Kerton FM. Aluminum Methyl and Chloro Complexes Bearing Monoanionic Aminephenolate Ligands: Synthesis, Characterization, and Use in Polymerizations. Organometallics 2012. [DOI: 10.1021/om300757u] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Nduka Ikpo
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
| | - Stephanie M. Barbon
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
| | - Marcus W. Drover
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
| | - Louise N. Dawe
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
- X-ray Crystallography Laboratory, Center for Chemical
Analysis, Research and Training, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
| | - Francesca M. Kerton
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
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39
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Synthesis, structure, and reactivity of AlMe2(1-Me-CB11F11): An AlMe2+ cation-like species bonded to a superweak anion. J Fluor Chem 2012. [DOI: 10.1016/j.jfluchem.2012.02.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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40
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Azor L, Bailly C, Brelot L, Henry M, Mobian P, Dagorne S. Stereoselective Synthesis of Biphenolate/Binaphtolate Titanate and Zirconate Alkoxide Species: Structural Characterization and Use in the Controlled ROP of Lactide. Inorg Chem 2012; 51:10876-83. [DOI: 10.1021/ic301352t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Laurine Azor
- Laboratoire DECOMET, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Corinne Bailly
- Service de Radiocristallographie, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Lydia Brelot
- Service de Radiocristallographie, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Marc Henry
- Laboratoire de Chimie moléculaire
de l′Etat Solide, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Pierre Mobian
- Laboratoire de Chimie moléculaire
de l′Etat Solide, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Samuel Dagorne
- Laboratoire DECOMET, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
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41
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Tai WJ, Li CY, Lin PH, Li JY, Chen MJ, Ko BT. Synthesis and characterization of aluminum complexes based on amino-benzotriazole phenoxide ligand: luminescent properties and catalysis for ring-opening polymerization. Appl Organomet Chem 2012. [DOI: 10.1002/aoc.2894] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wan-Ju Tai
- Department of Chemistry; Chung Yuan Christian University; Chung-Li; 32023; Taiwan
| | - Chen-Yu Li
- Department of Chemistry; Chung Yuan Christian University; Chung-Li; 32023; Taiwan
| | - Pei-Hua Lin
- Department of Chemistry; Chung Yuan Christian University; Chung-Li; 32023; Taiwan
| | - Jia-Ying Li
- Department of Chemistry; Chung Yuan Christian University; Chung-Li; 32023; Taiwan
| | - Ming-Jen Chen
- Department of Applied Cosmetology and Graduate Institute of Cosmetic Science; Hungkuang University; Taichung Hsien; 433; Taiwan
| | - Bao-Tsan Ko
- Department of Chemistry; Chung Yuan Christian University; Chung-Li; 32023; Taiwan
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42
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Ikpo N, Hoffmann C, Dawe LN, Kerton FM. Ring-opening polymerization of ε-caprolactone by lithium piperazinyl-aminephenolate complexes: synthesis, characterization and kinetic studies. Dalton Trans 2012; 41:6651-60. [PMID: 22511217 DOI: 10.1039/c2dt30276d] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of lithium complexes were prepared from 2(N-piperazinyl-N'-methyl)-2-methylene-4-R'-6-R-phenols ([ONN](RR')) and characterized through elemental analysis, (1)H and (13)C{(1)H} NMR spectroscopy, and X-ray crystallography. Treatment of the ligands with n-butyllithium afforded {Li[ONN](RR')}(3) [R = Me, R' = (t)Bu, (1); R = R' = (t)Bu (2); R = R' = (t)Am, (3), (t)Am = C(CH(3))(2)CH(2)CH(3)], with trimetallic structures in the solid-state as shown by single-crystal X-ray diffraction. The reactivity of these complexes in the ring-opening polymerization of ε-caprolactone (ε-CL), as well as the influences of monomer concentration, monomer/Li molar ratio, polymerization temperature and time, was studied. Rates of polymerization were first order with respect to both monomer and lithium concentrations, and activation energies for the reactions were determined. MALDI-TOF MS analysis revealed that transesterification had occurred during the polymerization.
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Affiliation(s)
- Nduka Ikpo
- Department of Chemistry, Memorial University of Newfoundland, St. John's, NL A1B 3X7, Canada
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43
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Hild F, Dagorne S. A Discrete N,O,N-Supported Gallium Amido Complex for the Intermolecular Hydroamination of Terminal Alkynes. Organometallics 2012. [DOI: 10.1021/om2012584] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frédéric Hild
- Laboratoire DECOMET, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Samuel Dagorne
- Laboratoire DECOMET, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
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44
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Structural diversity and versatility for organoaluminum complexes supported by mono- and di-anionic aminophenolate bidentate ligands. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2011.09.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Romain C, Rosa V, Fliedel C, Bier F, Hild F, Welter R, Dagorne S, Avilés T. Highly active zinc alkyl cations for the controlled and immortal ring-opening polymerization of ε-caprolactone. Dalton Trans 2012; 41:3377-9. [DOI: 10.1039/c2dt12336c] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Simple Trivalent Organoaluminum Species: Perspectives on Structure, Bonding, and Reactivity. TOP ORGANOMETAL CHEM 2012. [DOI: 10.1007/3418_2012_55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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47
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Dagorne S, Fliedel C. Organoaluminum Species in Homogeneous Polymerization Catalysis. TOP ORGANOMETAL CHEM 2012. [DOI: 10.1007/3418_2012_35] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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48
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Ikpo N, Saunders LN, Walsh JL, Smith JMB, Dawe LN, Kerton FM. Zinc Complexes of Piperazinyl-Derived Aminephenolate Ligands: Synthesis, Characterization and Ring-Opening Polymerization Activity. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100703] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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49
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Sarazin Y, Liu B, Roisnel T, Maron L, Carpentier JF. Discrete, solvent-free alkaline-earth metal cations: metal···fluorine interactions and ROP catalytic activity. J Am Chem Soc 2011; 133:9069-87. [PMID: 21545119 DOI: 10.1021/ja2024977] [Citation(s) in RCA: 182] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Efficient protocols for the syntheses of well-defined, solvent-free cations of the large alkaline-earth (Ae) metals (Ca, Sr, Ba) and their smaller Zn and Mg analogues have been designed. The reaction of 2,4-di-tert-butyl-6-(morpholinomethyl)phenol ({LO(1)}H), 2-{[bis(2-methoxyethyl)amino]methyl}-4,6-di-tert-butylphenol ({LO(2)}H), 2-[(1,4,7,10-tetraoxa-13-azacyclopentadecan-13-yl)methyl]-4,6-di-tert-butylphenol ({LO(3)}H), and 2-[(1,4,7,10-tetraoxa-13-azacyclo-pentadecan-13-yl)methyl]-1,1,1,3,3,3-hexafluoropropan-2-ol ({RO(3)}H) with [H(OEt(2))(2)](+)[H(2)N{B(C(6)F(5))(3)}(2)](-) readily afforded the doubly acidic pro-ligands [{LO(1)}HH](+)[X](-) (1), [{LO(2)}HH](+)[X](-) (2), [{LO(3)}HH](+)[X](-) (3), and [{RO(3)}HH](+)[X](-) (4) ([X](-) = [H(2)N{B(C(6)F(5))(3)}(2)](-)). The addition of 2 to Ca[N(SiMe(3))(2)](2)(THF)(2) and Sr[N(SiMe(3))(2)](2)(THF)(2) yielded [{LO(2)}Ca(THF)(0.5)](+)[X](-) (5) and [{LO(2)}Sr(THF)](+)[X](-) (6), respectively. Alternatively, 5 could also be prepared upon treatment of {LO(2)}CaN(SiMe(3))(2) (7) with [H(OEt(2))(2)](+)[X](-). Complexes [{LO(3)}M](+)[X](-) (M = Zn, 8; Mg, 9; Ca, 10; Sr, 11; Ba, 12) and [{RO(3)}M](+)[X](-) (M = Zn, 13; Mg, 14; Ca, 15; Sr, 16; Ba, 17) were synthesized in high yields (70-90%) by reaction of 3 or 4 with the neutral precursors M[N(SiMe(3))(2)](2)(THF)(x) (M = Zn, Mg, x = 0; M = Ca, Sr, Ba, x = 2). All compounds were fully characterized by spectroscopic methods, and the solid-sate structures of compounds 1, 3, 7, 8, 13, 14, {15}(4)·3CD(2)Cl(2), {16}(4)·3CD(2)Cl(2), and {{17}(4)·EtOH}·3CD(2)Cl(2) were determined by X-ray diffraction crystallography. Whereas the complexes are monomeric in the case of Zn and Mg, they form bimetallic cations in the case of Ca, Sr and Ba; there is no contact between the metal and the weakly coordinating anion. In all metal complexes, the multidentate ligand is κ(6)-coordinated to the metal. Strong intramolecular M···F secondary interactions between the metal and F atoms from the ancillary ligands are observed in the structures of {15}(4)·3CD(2)Cl(2), {16}(4)·3CD(2)Cl(2), and {{17}(4)·EtOH}·3CD(2)Cl(2). VT (19)F{(1)H} NMR provided no direct evidence that these interactions are maintained in solution; nevertheless, significant Ae···F energies of stabilization of 25-26 (Ca, Ba) and 40 kcal·mol(-1) (Sr) were calculated by NBO analysis on DFT-optimized structures. The identity and integrity of the cationic complexes are preserved in solution in the presence of an excess of alcohol (BnOH, (i)PrOH) or L-lactide (L-LA). Efficient binary catalytic systems for the immortal ring-opening polymerization of L-LA (up to 3,000 equiv) are produced upon addition of an excess (5-50 equiv) of external protic nucleophilic agents (BnOH, (i)PrOH) to 8-12 or 13-17. PLLAs with M(n) up to 35,000 g·mol(-1) were produced in a very controlled fashion (M(w)/M(n) ≈ 1.10-1.20) and without epimerization. In each series of catalysts, the following order of catalytic activity was established: Mg ≪ Zn < Ca < Sr ≈ Ba; also, Ae complexes supported by the aryloxide ligand are more active than their parents supported by the fluorinated alkoxide ancillary, possibly owing to the presence of Ae···F interactions in the latter case. The rate law -d[L-LA]/dt = k(p)·[L-LA](1.0)·[16](1.0)·[BnOH](1.0) was established by NMR kinetic investigations, with the corresponding activation parameters ΔH(++) = 14.8(5) kcal·mol(-1) and ΔS(++) = -7.6(2.0) cal·K(-1)·mol(-1). DFT calculations indicated that the observed order of catalytic activity matches an increase of the L-LA coordination energy onto the cationic metal centers with parallel decrease of the positive metal charge.
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Affiliation(s)
- Yann Sarazin
- UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1-CNRS, Campus de Beaulieu, 35042 Rennes Cedex, France.
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Lichtenberg C, Jochmann P, Spaniol TP, Okuda J. Das Calciumallyl-Monokation: ein verbrückender Allylligand in nicht-gewinkelter Koordinationsgeometrie. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100073] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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