1
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Mears KL, Bhide MA, Knapp CE, Carmalt CJ. Investigations into the structure, reactivity, and AACVD of aluminium and gallium amidoenoate complexes. Dalton Trans 2021; 51:156-167. [PMID: 34870650 DOI: 10.1039/d1dt03365d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Amidoenoate (AME = {ethyl-3-(R-amido)but-2-enoate}) complexes of aluminium and gallium, of the type: [AlCl2(AMER)] R = iPr (1-Al); [AlCl(AMER)2] R = iPr (2-Al), Dip (3-Al); [GaCl2(AMER)] R = iPr (1-Ga) and [GaCl(AMER)2] R = iPr (2-Ga), Dip (3-Ga), have been synthesised (iPr = isopropyl, Dip = 2,6-diisopropylphenyl). The coordination chemistry of these complexes has been studied in relation to precursor suitability. Investigations into the reactivity of the aluminium and gallium amidoenoate complexes involved reactions with hydride sources including alkali metal hydride salts, alkylsilanes, and magnesium hydride species and magnesium(I) dimers. The isolation of alkyl metal amidoenoate precursors including an aluminium hydride amidoenoate, [AlH(AMEDip)2] (4-Al) and dimethyl gallium amidoenoates [GaMe2(AMEDip)] (4-Ga), [GaMe2(AMEiPr)] (5-Ga) concluded the synthetic studies. A selection of the isolated complexes were used as precursors for aerosol assisted chemical vapour deposition (AACVD) at 500 °C. Thin films of either amorphous Al2O3 or Ga2O3 were deposited and subsequently annealed at 1000 °C to improve the materials' crystallinity. The films were characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-visible (UV-vis) spectroscopy and energy dispersive X-ray analysis (EDXA).
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Affiliation(s)
- Kristian L Mears
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Malavika A Bhide
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Caroline E Knapp
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Claire J Carmalt
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
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2
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Zhang H, Gao B, Huang G, Li D, Pang X. Highly Selective Polymerization of Rac-Lactide Initiated by Salen Aluminum Complex Bearing an Adamantane Derivative. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1918683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Haotian Zhang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China
| | - Bo Gao
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China
| | - Guiqiu Huang
- College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, People’s Republic of China
| | - Dongni Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China
- China–Japan Union Hospital of Jilin University, Jilin University, Changchun, China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
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3
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Turner ZR, Lamb JV, Robinson TP, Mandal D, Buffet JC, O Hare D. Ring-opening polymerisation of l- and rac-lactide using group 4 permethylpentalene aryloxides and alkoxides. Dalton Trans 2021; 50:4805-4818. [PMID: 33877178 DOI: 10.1039/d1dt00252j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of group 4 permethylpentalene (C8Me62-; Pn*) aryloxide and alkoxide complexes have been synthesised and fully characterised by multinuclear NMR spectroscopy and single-crystal X-ray diffraction; (η8-C8Me6)Zr(OR)2 (R = tBu (1), 2,6-Me-C6H3 (2), 2,6-iPr-C6H3 (3) and 4-OMe-C6H4 (4)), (η8-C8Me6)Zr (OR) (R = 2,6-tBu-C6H3 (5) and 2,6-tBu-4-Me-C6H2 (6)), (η8-C8Me6)ZrCp(OR) (R = tBu (7), 2,6-Me-C6H3 (8) and 2,6-iPr-C6H3 (9)), (η8-C8Me6)TiCp(O-2,6-Me-C6H3) (10) and (η8-C8Me6)ZrCpMe(OR) (R = 2,6-Me-C6H3 (11), 2,6-iPr-C6H3 (12) and 2,4-tBu-C6H3 (13)). 2, 3, 6, 7, 9, 10 and 12 were studied as initiators for the ring-opening polymerisation (ROP) of l-lactide, and 2, 3, 6, 7 and 10 were studied as initiators for the ROP of rac-lactide. 3 was found to be the most active initiator for the ROP of l-lactide (kobs = 0.35 h-1) and 2 for the ROP of rac-lactide (kobs = 0.21 h-1). These initiators produced isotactic PLA for the ROP of l-lactide and moderately heterotactic enriched (maximum Pr of 0.69) or atactic PLA for the ROP of rac-lactide with polymer chains consisting of polylactic acid repeat units with -OR and -OH end groups.
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Affiliation(s)
- Zoë R Turner
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12, Mansfield Road, OX1 3TA, Oxford, UK.
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4
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Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters. Catalysts 2020. [DOI: 10.3390/catal10070800] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
This review describes the recent advances (from 2008 onwards) in the use of Schiff-base metal complexes as catalysts for the ring opening polymerization (ROP) of cyclic esters. The synthesis and structure of the metal complexes, as well as all aspects concerning the polymerization process and the characteristics of the polymers formed, will be discussed.
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5
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Luke AM, Peterson A, Chiniforoush S, Mandal M, Popowski Y, Sajjad H, Bouchey CJ, Shopov DY, Graziano BJ, Yao LJ, Cramer CJ, Reineke TM, Tolman WB. Mechanism of Initiation Stereocontrol in Polymerization of rac-Lactide by Aluminum Complexes Supported by Indolide–Imine Ligands. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00092] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Anna M. Luke
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- NSF Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Appie Peterson
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, 1 Brookings Drive, St. Louis, Missouri 63130, United States
- NSF Center for Sustainable Polymers, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Sina Chiniforoush
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- NSF Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Mukunda Mandal
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- NSF Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Yanay Popowski
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, 1 Brookings Drive, St. Louis, Missouri 63130, United States
- NSF Center for Sustainable Polymers, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Hussnain Sajjad
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Caitlin J. Bouchey
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, 1 Brookings Drive, St. Louis, Missouri 63130, United States
| | - Dimitar Y. Shopov
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, 1 Brookings Drive, St. Louis, Missouri 63130, United States
| | - Brendan J. Graziano
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Letitia J. Yao
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Christopher J. Cramer
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- NSF Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- Supercomputing Institute, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Theresa M. Reineke
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
- NSF Center for Sustainable Polymers, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - William B. Tolman
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, 1 Brookings Drive, St. Louis, Missouri 63130, United States
- NSF Center for Sustainable Polymers, Washington University in St. Louis, St. Louis, Missouri 63130, United States
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6
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Ghosh S, Wölper C, Tjaberings A, Gröschel AH, Schulz S. Syntheses, structures and catalytic activity of tetranuclear Mg complexes in the ROP of cyclic esters under industrially relevant conditions. Dalton Trans 2020; 49:375-387. [PMID: 31829382 DOI: 10.1039/c9dt04359d] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Tetranuclear magnesium imino(phenolate) complexes Mg4(L1–4)4 are excellent catalysts for the ROP of bulk rac-lactide and ε-caprolactone under industrially relevant conditions.
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Affiliation(s)
- Swarup Ghosh
- Faculty of Chemistry
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)
- D-45141 Essen
- Germany
| | - Christoph Wölper
- Faculty of Chemistry
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)
- D-45141 Essen
- Germany
| | - Alexander Tjaberings
- Faculty of Chemistry
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)
- NanoEnergieTechnikZentrum
- 47057 Duisburg
- Germany
| | - André H. Gröschel
- Faculty of Chemistry
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)
- NanoEnergieTechnikZentrum
- 47057 Duisburg
- Germany
| | - Stephan Schulz
- Faculty of Chemistry
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)
- D-45141 Essen
- Germany
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7
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Diteepeng N, Buffet JC, Turner ZR, O'Hare D. Constrained geometry scandium permethylindenyl complexes for the ring-opening polymerisation of l- and rac-lactide. Dalton Trans 2019; 48:16099-16107. [PMID: 31617518 DOI: 10.1039/c9dt03450a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterisation of constrained geometry scandium permethylindenyl chloride, aryloxide and borohydride complexes Me2SB(tBuN,I*)Sc(Cl)(THF) (1), Me2SB(tBuN,I*)Sc(O-2,6-iPr-C6H3)(THF) (2), Me2SB(tBuN,I*)Sc(O-2,4-tBu-C6H3)(THF) (3) and Me2SB(tBuN,I*)Sc(BH4)(THF) (4) are reported. The activity of complexes 1-4 as initiators for the ring-opening polymerisation (ROP) of l- and rac-lactide is presented. The ROP of l- and rac-lactide using complexes 2 and 3 show first-order dependence on monomer concentration, and produced isotactic polylactide (PLA) and moderately heterotactic PLA (Pr = 0.68-0.72), respectively. Good agreement between experimental and theoretical molecular weights of PLA (Mn) and relatively narrow dispersities (Mw/Mn < 1.20) were obtained. Complex 4 showed higher activity for ROP of l- and rac-lactide than 2 or 3, with second-order dependence on monomer concentrations. However, poorly controlled molecular weights and lower heteroselectivity (Pr = 0.61-0.67) were observed. The effect of temperature and catalyst concentration for the ROP of l-lactide using 2 and 3 was also studied.
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Affiliation(s)
- Nichabhat Diteepeng
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
| | - Jean-Charles Buffet
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
| | - Zoë R Turner
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
| | - Dermot O'Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
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8
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Li D, Gao B, Duan Q. Preparation of star-shaped functionalized polylactides by metal porphyrin complexes as both catalysts and cocatalysts. J PORPHYR PHTHALOCYA 2019. [DOI: 10.1142/s1088424619500603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Several aluminum porphyrin complexes as catalysts and a copper porphyrin complex as a cocatalyst were prepared. These complexes were characterized by 1H NMR and elemental analysis. These complexes are used for L-lactide polymerization. The kinetic data of the polymerization using complex 2 as catalyst revealed that the polymeric rates were first-ordered in both the monomer and catalyst. There is a linear relationship between lactide conversion and the number-averaged molecular weight of PLA.
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Affiliation(s)
- Dongni Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Department of Blood Transfusion, China–Japan Union Hospital of Jilin University, Jilin University, 126 Xiantai Street, Changchun, 130033, China
| | - Bo Gao
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, China
| | - Qian Duan
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, China
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9
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Lyubov DM, Tolpygin AO, Trifonov AA. Rare-earth metal complexes as catalysts for ring-opening polymerization of cyclic esters. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.04.013] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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10
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Lim JYC, Yuntawattana N, Beer PD, Williams CK. Isoselective Lactide Ring Opening Polymerisation using [2]Rotaxane Catalysts. Angew Chem Int Ed Engl 2019; 58:6007-6011. [PMID: 30861303 PMCID: PMC6519244 DOI: 10.1002/anie.201901592] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Indexed: 01/25/2023]
Abstract
Polylactide (PLA) is a fully biodegradable and recyclable plastic, produced from a bio-derived monomer: it is a circular economy plastic. Its properties depend upon its stereochemistry and isotactic PLA shows superior thermal-mechanical performances. Here, a new means to control tacticity by exploiting rotaxane conformational dynamism is described. Dynamic achiral [2]rotaxanes can show high isoselectivity (Pi =0.8, 298 K) without requiring any chiral additives and enchain by a chain end control mechanism. The organocatalytic dynamic stereoselectivity is likely applicable to other small-molecule and polymerization catalyses.
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Affiliation(s)
- Jason Y. C. Lim
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
- Current address: Institute of Materials Research and Engineering2 Fusionopolis WaySingapore138634Singapore
| | - Nattawut Yuntawattana
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Paul D. Beer
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Charlotte K. Williams
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
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11
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Lim JYC, Yuntawattana N, Beer PD, Williams CK. Isoselective Lactide Ring Opening Polymerisation using [2]Rotaxane Catalysts. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901592] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jason Y. C. Lim
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
- Current address: Institute of Materials Research and Engineering 2 Fusionopolis Way Singapore 138634 Singapore
| | - Nattawut Yuntawattana
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Paul D. Beer
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Charlotte K. Williams
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
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12
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Li D, Gao B, Duan Q. Synthesis of biodegradable and biorenewable polylactides initiated by aluminum complexes bearing m-xylylenediamine derivatives via the ring-opening polymerization of lactides. NEW J CHEM 2019. [DOI: 10.1039/c9nj01268k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Aluminum complexes derived from m-xylylenediamine were synthesized and investigated as initiators for l-lactide and rac-lactide polymerization.
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Affiliation(s)
- Dongni Li
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- 7989 Weixing Road
- Changchun 130022
- China
| | - Bo Gao
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- 7989 Weixing Road
- Changchun 130022
- China
| | - Qian Duan
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- 7989 Weixing Road
- Changchun 130022
- China
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13
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Satheesh V, Srivastava HK, Kumar SV, Sengoden M, Punniyamurthy T. Stereospecific Al‐Catalysed Tandem
C−N
/
C−Se
Bond Formation of Isoselenocyanates with Aziridines: Synthesis and DFT Study. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Vanaparthi Satheesh
- Department of ChemistryIndian Institute of Technology Guwahati Guwahati 781039 India
| | | | | | - Mani Sengoden
- Department of ChemistryIndian Institute of Technology Guwahati Guwahati 781039 India
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14
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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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15
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Rufino-Felipe E, Lopez N, Vengoechea-Gómez FA, Guerrero-Ramírez LG, Muñoz-Hernández MÁ. Ring-opening polymerization ofrac-lactide catalyzed by Al(III) and Zn(II) complexes incorporating Schiff base ligands derived from pyrrole-2-carboxaldehyde. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4315] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ernesto Rufino-Felipe
- Centro de Investigaciones Químicas, IICBA; Universidad Autónoma del Estado de Morelos; Av. Universidad 1001, Col. Chamilpa Cuernavaca Morelos 62209 Mexico
| | - Nazario Lopez
- Centro de Investigaciones Químicas, IICBA; Universidad Autónoma del Estado de Morelos; Av. Universidad 1001, Col. Chamilpa Cuernavaca Morelos 62209 Mexico
| | - Fabio A. Vengoechea-Gómez
- Centro de Investigaciones Químicas, IICBA; Universidad Autónoma del Estado de Morelos; Av. Universidad 1001, Col. Chamilpa Cuernavaca Morelos 62209 Mexico
| | - Luis-Guillermo Guerrero-Ramírez
- Centro Universitario de Ciencias Exactas e Ingenierías, Departamento de Química; Universidad de Guadalajara; Boulevard Marcelino García Barragán 1421 Guadalajara Jalisco 44430 Mexico
| | - Miguel-Ángel Muñoz-Hernández
- Centro de Investigaciones Químicas, IICBA; Universidad Autónoma del Estado de Morelos; Av. Universidad 1001, Col. Chamilpa Cuernavaca Morelos 62209 Mexico
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16
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17
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Marín IM, Auffrant A. Phosphasalen vs. Salen Ligands: What Does the Phosphorus Change? Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701210] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Irene Mustieles Marín
- LCM, CNRS-Ecole polytechnique; Université Paris-Saclay; F-91128 Palaiseau Cedex France
| | - Audrey Auffrant
- LCM, CNRS-Ecole polytechnique; Université Paris-Saclay; F-91128 Palaiseau Cedex France
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18
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Synthesis of Li(I), Zn(II) and Mg(II) complexes of amine bis(phenolates) and their exploitation for the ring opening polymerisation of rac-lactide. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.08.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Bhattacharjee J, Harinath A, Nayek HP, Sarkar A, Panda TK. Highly Active and Iso-Selective Catalysts for the Ring-Opening Polymerization of Cyclic Esters using Group 2 Metal Initiators. Chemistry 2017; 23:9319-9331. [DOI: 10.1002/chem.201700672] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| | - Adimulam Harinath
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| | - Hari Pada Nayek
- Department of Applied Chemistry; Indian Institute of Technology (ISM), Dhanbad; 826004 Jharkhand India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd. Survey No. 09; Hosur Road Electronic City (West) Bangalore 560100 India
| | - Tarun K. Panda
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
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20
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Rajendran NM, Xi Y, Zhang W, Sun Y, Sun W. Lithium Quinolyl‐Amidinates Efficiently Promoting Ring‐Opening Polymerization of ε‐Caprolactone: Synthesis and
7
Li NMR Spectroscopic Studies. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Natesan Mannangatti Rajendran
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
| | - Yanxia Xi
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
| | - Wenjuan Zhang
- School of Materials Science and Engineering Beijing Institute of Fashion Technology 100029 Beijing China
| | - Yang Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
| | - Wen‐Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
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21
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Luo W, Shi T, Liu S, Zuo W, Li Z. Well-Designed Unsymmetrical Salphen-Al Complexes: Synthesis, Characterization, and Ring-Opening Polymerization Catalysis. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00106] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wenlong Luo
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Tong Shi
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Shaofeng Liu
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
- State
Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, P. R. China
| | - Weiwei Zuo
- State
Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, P. R. China
| | - Zhibo Li
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
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22
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Wang X, Zhao KQ, Al-Khafaji Y, Mo S, Prior TJ, Elsegood MRJ, Redshaw C. Organoaluminium Complexes Derived from Anilines or Schiff Bases for the Ring-Opening Polymerization of ε-Caprolactone, δ-Valerolactone andrac-Lactide. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601415] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xue Wang
- College of Chemistry and Materials Science; Sichuan Normal University; 610066 Chengdu China
| | - Ke-Qing Zhao
- College of Chemistry and Materials Science; Sichuan Normal University; 610066 Chengdu China
| | - Yahya Al-Khafaji
- School of Mathematics and Physical Sciences; University of Hull; HU6 7RX Hull U.K
| | - Shangyan Mo
- School of Mathematics and Physical Sciences; University of Hull; HU6 7RX Hull U.K
| | - Timothy J. Prior
- School of Mathematics and Physical Sciences; University of Hull; HU6 7RX Hull U.K
| | - Mark R. J. Elsegood
- Chemistry Department; Loughborough University; LE11 3TU Loughborough Leicestershire U.K
| | - Carl Redshaw
- College of Chemistry and Materials Science; Sichuan Normal University; 610066 Chengdu China
- School of Mathematics and Physical Sciences; University of Hull; HU6 7RX Hull U.K
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23
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Xu TQ, Yang GW, Liu C, Lu XB. Highly Robust Yttrium Bis(phenolate) Ether Catalysts for Excellent Isoselective Ring-Opening Polymerization of Racemic Lactide. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02439] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Tie-Qi Xu
- College
of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Guan-Wen Yang
- College
of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
- MOE
Laboratory of Macromolecular Synthesis and Functionalization, Department
of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
| | - Chuang Liu
- College
of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xiao-Bing Lu
- College
of Chemistry, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
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24
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Chen C, Cui Y, Mao X, Pan X, Wu J. Suppressing Cyclic Polymerization for Isoselective Synthesis of High-Molecular-Weight Linear Polylactide Catalyzed by Sodium/Potassium Sulfonamidate Complexes. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b02271] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Changjuan Chen
- State Key Laboratory
of Applied Organic Chemistry, College of Chemistry and Chemical Engineering,
Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, Lanzhou University, Lanzhou 730000, People’s Republic of China
- College
of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, People’s Republic of China
| | - Yaqin Cui
- State Key Laboratory
of Applied Organic Chemistry, College of Chemistry and Chemical Engineering,
Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Xiaoyang Mao
- State Key Laboratory
of Applied Organic Chemistry, College of Chemistry and Chemical Engineering,
Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Xiaobo Pan
- State Key Laboratory
of Applied Organic Chemistry, College of Chemistry and Chemical Engineering,
Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Jincai Wu
- State Key Laboratory
of Applied Organic Chemistry, College of Chemistry and Chemical Engineering,
Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, Lanzhou University, Lanzhou 730000, People’s Republic of China
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25
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Xi Y, Rajendran NM, Zhang W, Sun Y, Lei M, Sun WH. Quinolyl-Amidinates Chelating Bimetallic Magnesium and Mononuclear Aluminum Complexes forϵ-Caprolactone Polymerization. ChemistrySelect 2016. [DOI: 10.1002/slct.201601517] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yanxia Xi
- State Key Laboratory of Chemical Resource Engineering, Institute of Material Medicine, College of Science; Beijing University of Chemical Technology; Beijing 100029 China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Natesan Mannangatti Rajendran
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Wenjuan Zhang
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Yang Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Ming Lei
- State Key Laboratory of Chemical Resource Engineering, Institute of Material Medicine, College of Science; Beijing University of Chemical Technology; Beijing 100029 China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
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26
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Guo Z, Wang S, Wei X. Aluminum complexes of β-hydroxy-imino ligands: Synthesis, structures and application in the Tishchenko reaction. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.06.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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27
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Rajashekhar B, Roymuhury SK, Chakraborty D, Ramkumar V. Group 4 metal complexes of Trost's semi-crown ligand: synthesis, structural characterization and studies on the ring-opening polymerization of lactides and ε-caprolactone. Dalton Trans 2016; 44:16280-93. [PMID: 26262508 DOI: 10.1039/c5dt02267c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of titanium(IV), zirconium(IV) and hafnium(IV) complexes of Trost's semi-crown ligand is described. All complexes were fully characterized by 1H and 13C NMR and mass spectroscopy. The molecular structures of the representative complexes 2, 3 and 4 were determined by single-crystal X-ray diffraction studies. The X-ray diffraction studies reveal that complexes 2, 3 and 4 crystallized in an orthorhombic crystal system. Complexes 2 and 3 have a monomeric structure in the solid state with distorted octahedral geometry around the metal center, whereas complex 4 was found to crystallize in a trimeric structure bridging with an oxygen atom, where the geometry around the titanium is distorted trigonal bipyramidal. The activities and stereoselectivities of these complexes toward the ring-opening polymerization (ROP) of lactides (L-LA and rac-LA) and ε-caprolactone (CL) have been investigated. Complexes 1–4 were found to be efficient single-component initiators for the ring-opening polymerization of cyclic esters and yielded high molecular weight polymers (Mn) with narrow molecular weight distributions (MWD).The microstructure of the resultant polylactides (PLAs) from rac-LA was determined. Complexes 2 and 3 afforded isotactic-enriched PLA (Pm = 0.78–0.71) with narrow MWD (1.07–1.04), on the other hand complexes 1 and 4 produced atactic PLA. Kinetic and post polymerization studies confirm that the polymerization proceeds through the coordination–insertion mechanism.
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Affiliation(s)
- Bijja Rajashekhar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600 036, Tamil Nadu, India.
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28
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Ou HW, Lo KH, Du WT, Lu WY, Chuang WJ, Huang BH, Chen HY, Lin CC. Synthesis of Sodium Complexes Supported with NNO-Tridentate Schiff Base Ligands and Their Applications in the Ring-Opening Polymerization of L-Lactide. Inorg Chem 2016; 55:1423-32. [PMID: 26828572 DOI: 10.1021/acs.inorgchem.5b02043] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of sodium complexes bearing NNO-tridentate Schiff base ligands with an N-pendant arm were synthesized and used as catalysts for the ring-opening polymerization of L-lactide (L-LA). Electronic effects of ancillary ligands coordinated by sodium complexes substantially influence the catalysis, and ligands with electron-donating groups increase the catalytic activity of the sodium complexes for catalyzing L-LA polymerization. In particular, a sodium complex bearing a 4-methoxy group has the highest activity with conversion up to 95% within 30 s at 0 °C and a low polydispersity index of 1.13, whereas the 4-bromo group showed the poorest performance with regard to the catalytic rate of L-LA polymerization in the presence of benzyl alcohol (BnOH). (1)H NMR pulsed-gradient spin-echo diffusion experiments and single-crystal X-ray analyses showed that sodium complexes [L(H)Na(THF)]2 and [L(4-Cl)Na(THF)]2 were dinuclear species in both solution and the solid state. The kinetic results indicated a first-order dependence on each of [[L(4-Cl)Na]2], [l-LA], and [BnOH].
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Affiliation(s)
- Hsiu-Wei Ou
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Kai-Hsuan Lo
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wei-Ting Du
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wei-Yi Lu
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wan-Jung Chuang
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , Kaohsiung 80708, Taiwan, Republic of China
| | - Bor-Hunn Huang
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , Kaohsiung 80708, Taiwan, Republic of China
| | - Chu-Chieh Lin
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
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29
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Isnard F, Lamberti M, Lettieri L, D'auria I, Press K, Troiano R, Mazzeo M. Bimetallic salen aluminum complexes: cooperation between reactive centers in the ring-opening polymerization of lactides and epoxides. Dalton Trans 2016; 45:16001-16010. [DOI: 10.1039/c6dt02592g] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In dinuclear aluminum complexes, opportunely designed to have proximal coordinative pockets, the communication between the two reactive centers allows enhanced catalytic performances.
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Affiliation(s)
- Florence Isnard
- Department of Chemistry and Biology “A. Zambelli” University of Salerno
- I-84084
- 132 Fisciano
- Italy
| | - Marina Lamberti
- Department of Physics “E. Caianiello” University of Salerno
- I-84084
- 132 Fisciano
- Italy
| | - Luana Lettieri
- Department of Chemistry and Biology “A. Zambelli” University of Salerno
- I-84084
- 132 Fisciano
- Italy
| | - Ilaria D'auria
- Department of Chemistry and Biology “A. Zambelli” University of Salerno
- I-84084
- 132 Fisciano
- Italy
| | - Konstantin Press
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Ramat Aviv
- Tel Aviv 69978
| | - Rubina Troiano
- Department of Chemistry and Biology “A. Zambelli” University of Salerno
- I-84084
- 132 Fisciano
- Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology “A. Zambelli” University of Salerno
- I-84084
- 132 Fisciano
- Italy
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30
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Horeglad P, Cybularczyk M, Litwińska A, Dąbrowska AM, Dranka M, Żukowska GZ, Urbańczyk M, Michalak M. Controlling the stereoselectivity of rac-LA polymerization by chiral recognition induced the formation of homochiral dimeric metal alkoxides. Polym Chem 2016. [DOI: 10.1039/c5py02005k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Chiral recognition of monomeric Me2MOR units resulting in the formation of homochiral dimeric species [Me2M(μ-OR)]2(M = Ga, In), leads to heteroselective catalysts for the ring opening polymerization ofrac-lactide (rac-LA).
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Affiliation(s)
- P. Horeglad
- Centre of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
| | - M. Cybularczyk
- Centre of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
- Faculty of Chemistry
| | - A. Litwińska
- Faculty of Chemistry
- University of Warsaw
- 02-093 Warsaw
- Poland
| | - A. M. Dąbrowska
- Centre of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
- Faculty of Chemistry
| | - M. Dranka
- Faculty of Chemistry
- Warsaw University of Technology
- Warsaw
- Poland
| | - G. Z. Żukowska
- Faculty of Chemistry
- Warsaw University of Technology
- Warsaw
- Poland
| | - M. Urbańczyk
- Centre of New Technologies
- University of Warsaw
- 02-097 Warsaw
- Poland
- Faculty of Chemistry
| | - M. Michalak
- Institute of Organic Chemistry
- Polish Academy of Science
- 01-224 Warsaw
- Poland
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31
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Sumrit P, Chuawong P, Nanok T, Duangthongyou T, Hormnirun P. Aluminum complexes containing salicylbenzoxazole ligands and their application in the ring-opening polymerization of rac-lactide and ε-caprolactone. Dalton Trans 2016; 45:9250-66. [DOI: 10.1039/c6dt00990e] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two series of aluminum complexes supported by salicylbenzoxazole ligands were successfully synthesized and applied as active initiators for the ring-opening polymerization of rac-LA and ε-CL.
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Affiliation(s)
- Pattarawut Sumrit
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Kasetsart University
- Bangkok 10900
| | - Pitak Chuawong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- and Special Research Unit for Advanced Magnetic Resonance (AMR)
- Kasetsart University
- Bangkok 10900
| | - Tanin Nanok
- Department of Chemistry
- Faculty of Science
- Kasetsart University
- Bangkok 10900
- Thailand
| | | | - Pimpa Hormnirun
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Kasetsart University
- Bangkok 10900
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32
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Sun Y, Xiong J, Dai Z, Pan X, Tang N, Wu J. Stereoselective Alkali-Metal Catalysts for Highly Isotactic Poly(rac-lactide) Synthesis. Inorg Chem 2015; 55:136-43. [PMID: 26684962 DOI: 10.1021/acs.inorgchem.5b02709] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A high degree of chain end control in the isoselective ring-opening polymerization (ROP) of rac-lactide is a challenging research goal. In this work, eight highly active sodium and potassium phenolates as highly isoselective catalysts for the ROP of rac-lactide are reported. The best isoselectivity value of Pm = 0.94 is achieved. The isoselective mechanism is chain-end control through the analysis of the stereoerrors in the microstructure of a final polymer; thus, isotactic multiblock structure polymers are obtained, and the highest melt point can reach 192.5 °C. The donating group in phenolate can clearly accelerate the ROP reaction, potassium complexes are more active than the analogous sodium complexes, and the big spacial hindrance of the ligand can decrease the activity. The high isoselectivities of these complexes mostly result from their sandwich structure constructed by the plane of the crown and the plane of the anthryl group.
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Affiliation(s)
- Yangyang Sun
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Jiao Xiong
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Zhongran Dai
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Xiaobo Pan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Ning Tang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Jincai Wu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
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33
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Meduri A, Cozzolino M, Milione S, Press K, Sergeeva E, Tedesco C, Mazzeo M, Lamberti M. Yttrium and aluminium complexes bearing dithiodiolate ligands: synthesis and application in cyclic ester polymerization. Dalton Trans 2015; 44:17990-8000. [PMID: 26406112 DOI: 10.1039/c5dt02938d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Yttrium and aluminium complexes of two dithiodiolate ligands that feature different bridges (CF3)2C(OH)CH2SRSCH2C(OH)(CF3)2 (L(1)-H2, R = CH2CH2 and L(2)-H2, R = C6H4) were synthesized in good yields by reacting tris(silylamide)yttrium or trimethylaluminium with one equivalent of the proligand. All complexes were characterized by NMR and elemental analysis, and single-crystal X-ray structural analysis was also performed for one of the yttrium complexes. The catalytic activities of the four complexes in the ring-opening polymerization of ε-caprolactone and rac-lactide have been investigated. Furthermore, DOSY experiment and DFT calculations have been carried out to determine the structure of the isopropoxo derivative of the complex L(2)Y amide.
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Affiliation(s)
- A Meduri
- Dipartimento di Chimica e Biologia, Università di Salerno, via Giovanni Paolo II 132, I-84084, Fisciano, Salerno, Italy
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34
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Sun Y, Cui Y, Xiong J, Dai Z, Tang N, Wu J. Different mechanisms at different temperatures for the ring-opening polymerization of lactide catalyzed by binuclear magnesium and zinc alkoxides. Dalton Trans 2015; 44:16383-91. [PMID: 26308730 DOI: 10.1039/c5dt01784j] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two binuclear magnesium and zinc alkoxides supported by a bis-salalen type dinucleating heptadentate Schiff base ligand were synthesized and fully characterized. The two complexes are efficient initiators for the ring-opening polymerization (ROP) of L-lactide, affording polymers with narrow polydispersities and desirable molecular weights. Interestingly, the mechanisms for the ROP of lactide are different at different temperatures. At a high temperature of 130 °C, a coordination-insertion mechanism is reasonable for the bulk melt polymerization of lactide. At a low temperature, the alkoxide cannot initiate the ROP reaction; however, upon the addition of external benzyl alcohol into the system, the ROP of lactide can smoothly proceed via an "activated monomer" mechanism. In addition, these complexes display slight stereo-selectivity for the ring-opening polymerization of rac-lactide, affording partially isotactic polylactide in toluene with a Pm value of 0.59.
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Affiliation(s)
- Yangyang Sun
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province and State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
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35
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Tabthong S, Nanok T, Sumrit P, Kongsaeree P, Prabpai S, Chuawong P, Hormnirun P. Bis(pyrrolidene) Schiff Base Aluminum Complexes as Isoselective-Biased Initiators for the Controlled Ring-Opening Polymerization of rac-Lactide: Experimental and Theoretical Studies. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01381] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | | | | | - Palangpon Kongsaeree
- Department
of Chemistry and Center for Excellence in Protein Structure and Function,
Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Samran Prabpai
- Department
of Chemistry and Center for Excellence in Protein Structure and Function,
Faculty of Science, Mahidol University, Bangkok 10400, Thailand
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36
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Wang X, Brosmer JL, Thevenon A, Diaconescu PL. Highly Active Yttrium Catalysts for the Ring-Opening Polymerization of ε-Caprolactone and δ-Valerolactone. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00442] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xinke Wang
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Jonathan L. Brosmer
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Arnaud Thevenon
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095, United States
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37
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(Ferrocenylpyrazolyl)zinc(II) acetate complexes as initiators and catalysts for the ring opening polymerization of ϵ-caprolacton. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.05.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Effect of the phenyl ring substituent on stereoselectivity in the ring-opening polymerization of the rac-lactide initiated by salen aluminum complexes. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3720-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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39
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Horeglad P, Cybularczyk M, Trzaskowski B, Żukowska GZ, Dranka M, Zachara J. Dialkylgallium Alkoxides Stabilized with N-Heterocyclic Carbenes: Opportunities and Limitations for the Controlled and Stereoselective Polymerization of rac-Lactide. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00071] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paweł Horeglad
- Centre
of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Martyna Cybularczyk
- Centre
of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
- Faculty
of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Bartosz Trzaskowski
- Centre
of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Grażyna Zofia Żukowska
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Maciej Dranka
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Janusz Zachara
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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40
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Jones MD, Brady L, McKeown P, Buchard A, Schäfer PM, Thomas LH, Mahon MF, Woodman TJ, Lowe JP. Metal influence on the iso- and hetero-selectivity of complexes of bipyrrolidine derived salan ligands for the polymerisation of rac-lactide. Chem Sci 2015; 6:5034-5039. [PMID: 29142728 PMCID: PMC5664169 DOI: 10.1039/c5sc01819f] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 06/17/2015] [Indexed: 11/30/2022] Open
Abstract
A series complexes based on 2,2′-bipyrrolidine based salan ligands have been prepared and either isotactic or heterotactic PLA have been prepared.
In this paper we have prepared a series of Ti(iv), Hf(iv) and Al(iii) complexes based on bipyrrolidine salan pro-ligands. The Hf(iv) complexes have all been characterised in the solid-state, the chiral ligands coordinate to Hf(iv) in an α-cis manner whereas the meso ligand coordinates in a β-cis geometry. The Hf(iv) complexes are all active for the ROP of rac-lactide in the melt, with the fluxional meso complex affording a strong isotactic bias Pm = 0.84. As expected Hf(3)(OiPr)2 polymerised l-LA faster than rac-LA (kapp = 5.9 × 10–3 min–1vs. 3.8 × 10–3 min–1). For Ti(iv) complexes atactic PLA was formed. The salan pro-ligands have also been complexed to Al(iii), and the novel Al–Me and Al-OiPr complexes were characterised in the solid and solution state. Al(1)(OiPr) was fluxional on the NMR timescale, whereas Al(3)(OiPr) was locked in solution with no exchange. Interestingly, the Al(iii) complexes of 3H2 produce PLA with a very strong heterotactic bias Pr upto 0.87, whereas atactic PLA is produced with 1H2. For Al(3)(OiPr) a linear relationship is observed with Mn and conversion. Experiments with the addition of an equivalent of rac-LA to the selective initiators have also been performed and are discussed.
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Affiliation(s)
- Matthew D Jones
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
| | - Lauren Brady
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
| | - Paul McKeown
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908.,Doctoral Training Centre in Sustainable Chemical Technologies , University of Bath , Bath BA2 7AY , UK
| | - Antoine Buchard
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
| | - Pascal M Schäfer
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
| | - Lynne H Thomas
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
| | - Mary F Mahon
- Bath Chemical Crystallography Unit , Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK
| | - Timothy J Woodman
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
| | - John P Lowe
- Department of Chemistry , University of Bath , Claverton Down , Bath BA2 7AY , UK . ; ; Tel: +44 (0)1225 384908
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41
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Gu W, Xu P, Wang Y, Yao Y, Yuan D, Shen Q. Synthesis and Characterization of Yttrium and Ytterbium Complexes Supported by Salen Ligands and Their Catalytic Properties for rac-Lactide Polymerization. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00223] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Weikai Gu
- Key
Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key
Laboratory of Macromolecular Design and Precision Synthesis, College
of Chemistry, Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123 People’s Republic of China
| | - Pengfei Xu
- Key
Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key
Laboratory of Macromolecular Design and Precision Synthesis, College
of Chemistry, Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123 People’s Republic of China
| | - Yaorong Wang
- Key
Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key
Laboratory of Macromolecular Design and Precision Synthesis, College
of Chemistry, Chemical Engineering and 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 and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123 People’s Republic of China
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, 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 and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123 People’s Republic of China
| | - Qi Shen
- Key
Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key
Laboratory of Macromolecular Design and Precision Synthesis, College
of Chemistry, Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123 People’s Republic of China
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42
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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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43
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Brosmer JL, Diaconescu PL. Yttrium-Alkyl Complexes Supported by a Ferrocene-Based Phosphinimine Ligand. Organometallics 2015. [DOI: 10.1021/om501227t] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Jonathan L. Brosmer
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, California 90095, United States
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44
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Obuah C, Lochee Y, Jordaan JH, Otto DP, Nyokong T, Darkwa J. (Ferrocenylpyrazolyl)zinc(II) benzoates as catalysts for the ring opening polymerization of ε-caprolactone. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.02.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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45
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Bakewell C, White AJP, Long NJ, Williams CK. Scandium and Yttrium Phosphasalen Complexes as Initiators for Ring-Opening Polymerization of Cyclic Esters. Inorg Chem 2015; 54:2204-12. [DOI: 10.1021/ic5027015] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Clare Bakewell
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Nicholas J. Long
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
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46
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Gao B, Li D, Li X, Duan R, Pang X, Cui Y, Duan Q, Chen X. Preparation of biocompatible, biodegradable and sustainable polylactides catalyzed by aluminum complexes bearing unsymmetrical dinaphthalene-imine derivatives via ring-opening polymerization of lactides. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00982k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aluminum complexes bearing unsymmetrical dinaphthalene-imine ligands were employed for lactide polymerization.
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Affiliation(s)
- Bo Gao
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Dongni Li
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Xiang Li
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Ranlong Duan
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Yuan Cui
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Qian Duan
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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47
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Cui Y, Gu W, Wang Y, Zhao B, Yao Y, Shen Q. Synthesis and characterization of rare-earth metal complexes supported by a new pentadentate Schiff base and their application in heteroselective polymerization of rac-lactide. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00322a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Both rare-earth metal salen aryloxides and amides can efficiently initiate the ring-opening polymerization of rac-lactide to give heterotactic-rich polylactides.
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Affiliation(s)
- Yu Cui
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- College of Chemistry, Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
- Suzhou 215123
| | - Weikai Gu
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- College of Chemistry, Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
- Suzhou 215123
| | - Yaorong Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- College of Chemistry, Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
- Suzhou 215123
| | - Bei Zhao
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- College of Chemistry, Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
- Suzhou 215123
| | - 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 and Materials Science
- Dushu Lake Campus
- Soochow University
- Suzhou 215123
| | - Qi Shen
- Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- College of Chemistry, Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
- Suzhou 215123
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48
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Kireenko MM, Kuchuk EA, Zaitsev KV, Tafeenko VA, Oprunenko YF, Churakov AV, Lermontova EK, Zaitseva GS, Karlov SS. Aluminum complexes based on pyridine substituted alcohols: synthesis, structure, and catalytic application in ROP. Dalton Trans 2015; 44:11963-76. [DOI: 10.1039/c5dt01001b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
2,6-Bis(hydroxyalkyl)pyridines were used in the synthesis of Al complexes. The structure of the ligand determines the complex nature. Compounds were used as initiators of lactone ROP.
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Affiliation(s)
| | | | | | | | | | - Andrei V. Churakov
- Institute of General and Inorganic Chemistry
- Russian Acad. Sci
- 119991 Moscow
- Russia
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49
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Osten KM, Aluthge DC, Mehrkhodavandi P. The effect of steric changes on the isoselectivity of dinuclear indium catalysts for lactide polymerization. Dalton Trans 2015; 44:6126-39. [DOI: 10.1039/c5dt00222b] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Functionalized diaminophenolates as ligands for dinuclear indium catalysts were investigated in the ring-opening polymerization of lactide. An increase in the steric bulk of the ligand phenolates decreases the selectivity of the catalysts due to catalyst dissociation during polymerization.
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Affiliation(s)
- K. M. Osten
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - D. C. Aluthge
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - P. Mehrkhodavandi
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
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50
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Gao B, Duan Q, Li Y, Li D, Zhang L, Cui Y, Hu N, Pang X. Stereoselective ring-opening polymerization of rac-lactides catalyzed by titanium complexes containing N,N-bidentate phenanthrene derivatives. RSC Adv 2015. [DOI: 10.1039/c4ra15822a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Titanium complexes bearing N,N-bidentate diamido derived from Schiff bases were investigated as catalysts for lactide polymerization.
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Affiliation(s)
- Bo Gao
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
- Key Laboratory of Polymer Ecomaterials
| | - Qian Duan
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Yanhui Li
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Dongni Li
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
- Department of Blood Transfusion
| | - Liqiu Zhang
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Yuan Cui
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Ninghai Hu
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
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