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Tansky M, Comito RJ. Bimetallic polymerization of lactide with binaphthol-derived bis-heteroscorpionate dizinc and dimagnesium complexes. Dalton Trans 2023. [PMID: 37318380 DOI: 10.1039/d3dt00592e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Discrete bimetallic catalysts often provide enhanced reactivity and selectivity in lactone polymerization, making metal-metal cooperativity an important design principle for new catalyst development. However, the poor modularity of binucleating ligands limits structure-reactivity analysis and optimization. This report describes a modular, binucleating bis(pyrazolyl)alkane ligand series (1-R) bridged by a chiral binaphthol unit, prepared by nucleophile-catalyzed condensation between a dialdehyde and a bis(pyrazolyl)methanone. A bis(ethylzinc) complex was characterized by single-crystal X-ray diffraction, but in situ complexation with Zn(HMDS)2 and Mg(HMDS)2 provided more active catalysts for lactide polymerization (HMDS- = hexamethyldisilazide). Structure-reactivity studies identified complexes of 1-Me2 as the most active, and these catalysts show significant enhancements in rate compared to their monometallic analogues. Kinetic analysis resulted in first-order dependence on both mono- and bimetallic catalysts, suggesting metal-metal cooperativity as the basis for this rate enhancement. End-group analysis and low dispersity implicate a coordination-insertion mechanism through an alkoxide. Despite rapid transesterification observed by MALDI, we still demonstrated controlled polymerization in the block copolymerization of ε-caprolactone and L-lactide. Although we observed rate differences in the polymerization of L-lactide by opposite enantiomer catalysts, we did not observe catalyst-directed stereoselectivity in the polymerization of rac- or meso-lactide.
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Affiliation(s)
- Maxym Tansky
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| | - Robert J Comito
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
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2
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Gruszka W, Walker LC, Shaver MP, Garden JA. In Situ Versus Isolated Zinc Catalysts in the Selective Synthesis of Homo and Multi-block Polyesters. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00277] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Weronika Gruszka
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, United Kingdom
| | - Leah C. Walker
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, United Kingdom
| | - Michael P. Shaver
- School of Natural Sciences, Department of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom
- Henry Royce Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Jennifer A. Garden
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, United Kingdom
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3
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Akpan ED, Omondi B, Ojwach SO. Kinetics, mechanisms and polymer property studies of ring-opening polymerization of ɛ-caprolactone and lactides initiated by (benzimidazolylmethyl)amino Zn(II) alkoxides. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2321-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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4
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Abubekerov M, Wei J, Swartz KR, Xie Z, Pei Q, Diaconescu PL. Preparation of multiblock copolymers via step-wise addition of l-lactide and trimethylene carbonate. Chem Sci 2018; 9:2168-2178. [PMID: 29719690 PMCID: PMC5903370 DOI: 10.1039/c7sc04507g] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 01/10/2018] [Indexed: 01/14/2023] Open
Abstract
The synthesis of up to pentablock copolymers from various combinations of l-lactide and trimethylene carbonate was accomplished using a dinuclear zinc complex, and the physical, thermal, and mechanical properties of the resulting copolymers evaluated.
Poly(l-lactide) (PLA) is a bioderived and biodegradable polymer that has limited applications due to its hard and brittle nature. Incorporation of 1,3-trimethylene carbonate into PLA, in a block copolymer fashion, improves the mechanical properties, while retaining the biodegradability of the polymer, and broadens its range of applications. However, the preparation of 1,3-trimethylene carbonate (TMC)/l-lactide (LA) copolymers beyond diblock and triblock structures has not been reported, with explanations focusing mostly on thermodynamic reasons that impede the copolymerization of TMC after lactide. We discuss the preparation of multiblock copolymers via the ring opening polymerization (ROP) of LA and TMC, in a step-wise addition, by a ferrocene-chelating heteroscorpionate zinc complex, {[fc(PPh2)(BH[(3,5-Me)2pz]2)]Zn(μ-OCH2Ph)}2 ([(fcP,B)Zn(μ-OCH2Ph)]2, fc = 1,1′-ferrocenediyl, pz = pyrazole). The synthesis of up to pentablock copolymers, from various combinations of LA and TMC, was accomplished and the physical, thermal, and mechanical properties of the resulting copolymers evaluated.
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Affiliation(s)
- Mark Abubekerov
- Department of Chemistry and Biochemistry , University of California , Los Angeles , CA 90095 , USA .
| | - Junnian Wei
- Department of Chemistry and Biochemistry , University of California , Los Angeles , CA 90095 , USA .
| | - Kevin R Swartz
- Department of Chemistry and Biochemistry , University of California , Los Angeles , CA 90095 , USA .
| | - Zhixin Xie
- Department of Materials Science and Engineering , University of California , Los Angeles , CA 90095 , USA
| | - Qibing Pei
- Department of Materials Science and Engineering , University of California , Los Angeles , CA 90095 , USA
| | - Paula L Diaconescu
- Department of Chemistry and Biochemistry , University of California , Los Angeles , CA 90095 , USA .
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5
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Feng Q, Tong R. Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides. J Am Chem Soc 2017; 139:6177-6182. [DOI: 10.1021/jacs.7b01462] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Quanyou Feng
- Center for Molecular Systems and Organic Devices, Institute of Optoelectronic Materials, Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
- Department
of Chemical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, Virginia 24061, United States
| | - Rong Tong
- Department
of Chemical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, Virginia 24061, United States
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6
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Zikode M, Ojwach SO, Akerman MP. Bis(pyrazolylmethyl)pyridine Zn(II) and Cu(II) complexes: Molecular structures and kinetic studies of ring-opening polymerization of ε-caprolactone. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2015.12.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kottalanka RK, Harinath A, Rej S, Panda TK. Group 1 and group 2 metal complexes supported by a bidentate bulky iminopyrrolyl ligand: synthesis, structural diversity, and ε-caprolactone polymerization study. Dalton Trans 2015; 44:19865-79. [PMID: 26511076 DOI: 10.1039/c5dt03222a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report here a series of alkali and alkaline earth metal complexes, each with a bulky iminopyrrolyl ligand [2-(Ph3CN=CH)C4H3NH] (1-H) moiety in their coordination sphere, synthesized using either alkane elimination or silylamine elimination methods or the salt metathesis route. The lithium salt of molecular composition [Li(2-(Ph3CN=CH)C4H3N)(THF)2] (2) was prepared using the alkane elimination method, and the silylamine elimination method was used to synthesize the dimeric sodium and tetra-nuclear potassium salts of composition [(2-(Ph3CN=CH)C4H3N)Na(THF)]2 (3) and [(2-(Ph3CN=CH)C4H3N)K(THF)0.5]4 (4) respectively. The magnesium complex of composition [(THF)2Mg(CH2Ph){2-(Ph3CN=CH)C4H3N}] (5) was synthesized through the alkane elimination method, in which [Mg(CH2Ph)2(OEt2)2] was treated with the bulky iminopyrrole ligand 1-H in 1 : 1 molar ratio, whereas the bis(iminopyrrolyl)magnesium complex [(THF)2Mg{2-(Ph3CN=CH)C4H3N}2] (6) was isolated using the salt metathesis route. The heavier alkaline earth metal complexes of the general formula {(THF)nM(2-(Ph3CN=CH)C4H3N)2} [M = Ca (7), Sr (8), and n = 2; M = Ba (9), n = 3] were prepared in pure form using two synthetic methods: in the first method, the bulky iminopyrrole ligand 1-H was directly treated with the alkaline earth metal precursor [M{N(SiMe3)2}2(THF)n] (where M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent at ambient temperature. The complexes 7-9 were also obtained using the salt metathesis reaction, which involves the treatment of the potassium salt (4) with the corresponding metal diiodides MI2 (M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent. The molecular structures of all the metal complexes (1-H, 2-9) in the solid state were established through single-crystal X-ray diffraction analysis. The complexes 5-9 were tested as catalysts for the ring-opening polymerization of ε-caprolactone. High activity was observed in the heavier alkaline earth metal complexes 7-9, with a very narrow polydispersity index in comparison to that of magnesium complexes 5 and 6.
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Affiliation(s)
- Ravi K Kottalanka
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - A Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Supriya Rej
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
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Chen L, Li W, Yuan D, Zhang Y, Shen Q, Yao Y. Syntheses of Mononuclear and Dinuclear Aluminum Complexes Stabilized by Phenolato Ligands and Their Applications in the Polymerization of ε-Caprolactone: A Comparative Study. Inorg Chem 2015; 54:4699-708. [DOI: 10.1021/acs.inorgchem.5b00022] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- 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 and Materials Science, Dushu Lake
Campus, Soochow University, Hengyi Road, Suzhou 215123, People’s Republic of China
| | - 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 and Materials Science, Dushu Lake
Campus, Soochow University, Hengyi Road, 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 and Materials Science, Dushu Lake
Campus, Soochow University, Hengyi Road, 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 and Materials Science, Dushu Lake
Campus, Soochow University, Hengyi Road, 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, Hengyi Road, 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, Hengyi Road, 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
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Renny JS, Tomasevich LL, Tallmadge EH, Collum DB. Method of continuous variations: applications of job plots to the study of molecular associations in organometallic chemistry. Angew Chem Int Ed Engl 2013; 52:11998-2013. [PMID: 24166797 PMCID: PMC4028694 DOI: 10.1002/anie.201304157] [Citation(s) in RCA: 422] [Impact Index Per Article: 38.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Indexed: 11/10/2022]
Abstract
Applications of the method of continuous variations (MCV or the Method of Job) to problems of interest to organometallic chemists are described. MCV provides qualitative and quantitative insights into the stoichiometries underlying association of m molecules of A and n molecules of B to form A(m)B(n) . Applications to complex ensembles probe associations that form metal clusters and aggregates. Job plots in which reaction rates are monitored provide relative stoichiometries in rate-limiting transition structures. In a specialized variant, ligand- or solvent-dependent reaction rates are dissected into contributions in both the ground states and transition states, which affords insights into the full reaction coordinate from a single Job plot. Gaps in the literature are identified and critiqued.
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Affiliation(s)
- Joseph S. Renny
- Contribution from the Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Laura L. Tomasevich
- Contribution from the Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Evan H. Tallmadge
- Contribution from the Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - David B. Collum
- Contribution from the Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
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10
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Renny JS, Tomasevich LL, Tallmadge EH, Collum DB. Methode der kontinuierlichen Variation: Verwendung von Job-Plots zur Untersuchung molekularer Assoziationen in der metallorganischen Chemie. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304157] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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11
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Wang L, Bochmann M, Cannon RD, Carpentier J, Roisnel T, Sarazin Y. Kinetic Analysis of the Living Ring‐Opening Polymerisation of
L
‐Lactide with Tin(II) Initiators. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300964] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lingfang Wang
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS – Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, http://scienceschimiques.univ‐rennes1.fr/catalyse/carpentier/index.html
| | - Manfred Bochmann
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich UK NR4 7TJ, UK, http://www.uea.ac.uk/chemistry/people/faculty/bochmannm
| | - Roderick D. Cannon
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich UK NR4 7TJ, UK, http://www.uea.ac.uk/chemistry/people/faculty/bochmannm
| | - Jean‐François Carpentier
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS – Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, http://scienceschimiques.univ‐rennes1.fr/catalyse/carpentier/index.html
| | - Thierry Roisnel
- Centre de diffractométrie X, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS – Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Yann Sarazin
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS – Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France, http://scienceschimiques.univ‐rennes1.fr/catalyse/carpentier/index.html
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12
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Pilone A, Lamberti M, Mazzeo M, Milione S, Pellecchia C. Ring-opening polymerization of cyclic esters by phenoxy-thioether complexes derived from biocompatible metals. Dalton Trans 2013; 42:13036-47. [PMID: 23872640 DOI: 10.1039/c3dt51219c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of novel Mg(II) and Zn(II) complexes of the form LMX or L2M, supported by phenoxy-thioether ligands bearing different substituents at the ortho position of the thiophenol rings [L(-) = 4,6-tBu2-OC6H2-2-CH2S(2-R-C6H4)(-)] [M = Zn, R = H, X = N(SiMe3)2 (1) and X = Et (2); M = Mg, X = n-Bu, R = H (3), R = CH3 (4), R = Br (5); M = Mg, R = H (6)], were synthesized and characterized. Reaction of the proper zinc precursor (Zn[N(SiHMe2)2]2 or ZnEt2) with one equivalent of the phenoxy-thioether proligand produced the corresponding amido (1) and ethyl (2) zinc complexes in high yields. The monoalkylmagnesium complexes (3-5) were all obtained by butane elimination reaction of the dialkylmagnesium reagent, Mg(n-Bu)2, with one equivalent of the proligand in good yields. The homoleptic complex 6 was obtained by reaction of 0.5 equivalent of Mg(n-Bu)2 and the proper proligand. Variable temperature (1)H NMR studies performed on 2 and 3 demonstrated that the named complexes are involved in fluxional processes concerning a fast conformational change of the six-membered metallacycle. DOSY (Diffusion Ordered SpectroscopY) (1)H experiments and ligand scrambling strongly suggested that complexes 1-6 exist as dimeric species in solution. All complexes were active as catalysts in the ring-opening polymerization of cyclic esters. In particular, magnesium complexes showed superior ε-caprolactone and lactide ROP behavior in terms of activity, control of molecular weights and molecular weight distributions.
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Affiliation(s)
- Alessia Pilone
- Department of Chemistry and Biology, University of Salerno, I-84084, via Ponte don Melillo, Fisciano, Salerno, Italy.
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Kumar R, Sharma H. Synthesis and Characterization of Derivatives of Dibutyl Sn(IV)-Ti(IV)-μ-Oxoisopropoxide with Schiff Bases. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2012. [DOI: 10.5012/jkcs.2012.56.1.054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Darensbourg DJ, Karroonnirun O, Wilson SJ. Ring-Opening Polymerization of Cyclic Esters and Trimethylene Carbonate Catalyzed by Aluminum Half-Salen Complexes. Inorg Chem 2011; 50:6775-87. [DOI: 10.1021/ic2008057] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Donald J. Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Osit Karroonnirun
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Stephanie J. Wilson
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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Dubois P, Jérǒme R, Teyssié P. Aluminium alkoxides: A family of versatile initiators for the ring-opening polymerization of lactones and lactides. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19910420108] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Penczek S, Duda A, Slomkowski S. The reactivity-selectivity principle in polymerization. The case of polymerization of ϵ-caprolactone. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19920540106] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Barakat I, Dubois P, Jérǒme R, Teyssié P, Mazurek M. Polymerization of glycolide promoted by ω-Al-alkoxide poly(ϵ-caprolactone) macro-initiators and formation of stable colloidal dispersions. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19940880118] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Penczek S, Szymanski R, Duda A. Polymerizations with contribution of covalent and ionic species. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19950980116] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Penczek S, Duda A. Selectivity as a measure of “livingness” of the polymerization of cyclic esters. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19961070103] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Duda A, Penczek S. Kinetics of ε-caprolactone polymerization on dialkylaluminum alkoxides. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19910470111] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Lecomte P, Jérôme C. Recent Developments in Ring-Opening Polymerization of Lactones. SYNTHETIC BIODEGRADABLE POLYMERS 2011. [DOI: 10.1007/12_2011_144] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Liu J, Ling J, Li X, Shen Z. Monomer insertion mechanism of ring-opening polymerization of ɛ-caprolactone with yttrium alkoxide intermediate: A DFT study. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2008.10.038] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Controlled Ring-Opening Polymerization: Polymers with designed Macromolecular Architecture. ADVANCES IN POLYMER SCIENCE 2007. [DOI: 10.1007/3-540-45734-8_2] [Citation(s) in RCA: 271] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Nimitsiriwat N, Gibson VC, Marshall EL, White AJP, Dale SH, Elsegood MRJ. Tert-butylamidinate tin(ii) complexes: high activity, single-site initiators for the controlled production of polylactide. Dalton Trans 2007:4464-71. [PMID: 17909658 DOI: 10.1039/b706663e] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tin(ii) coordination chemistry of two monoanionic N,N'-bis(2,6-diisopropylphenyl)alkylamidinate ligands is described. Complexation studies with the acetamidinate, [MeC(NAr)(2)](-), (Ar = 2,6-(i)Pr(2)C(6)H(3)) are complicated by the side formation of the bis(amidinate) tin(ii) compound, [MeC(NAr)(2)](2)Sn. By contrast, the bulkier tert-butylamidinate, [(t)BuC(NAr)(2)](-), allows tin(ii) mono-halide, -alkoxide and -amide complexes to be isolated cleanly in high yields. Thus, the reaction of [(t)BuC(NAr)(2)]H with (n)BuLi and subsequent treatment with SnCl(2) generates [(t)BuC(NAr)(2)]SnCl, in ca. 70% yield. Reactions of with LiO(i)Pr, LiNMe(2) and LiNTMS(2) afford [(t)BuC(NAr)(2)]Sn(O(i)Pr), [(t)BuC(NAr)(2)]Sn(NMe(2)), and [(t)BuC(NAr)(2)]Sn(NTMS(2)), respectively. The molecular structures of complexes are reported. Complexes, and have been investigated as initiators for the ring-opening polymerisation of rac-lactide: and display characteristics of well-controlled polymerisation initiators, but high molecular weight polymer is observed with due to inefficient initiation, a consequence of the steric bulk of the NTMS(2) unit. Polymerisations with and are faster than for the corresponding beta-diketiminate tin(ii) complexes, consistent with the more open nature of the tin(ii) coordination sphere.
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Affiliation(s)
- Nonsee Nimitsiriwat
- Department of Chemistry, Imperial College London, South Kensington Campus, London, UKSW7 2AZ
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Mata-Mata JL, Gutiérrez JA, Paz-Sandoval MA, Madrigal AR, Martínez-Richa A. Ring-opening polymerization of ϵ-caprolactone initiated with different ruthenium derivatives: Kinetics and mechanism studies. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21787] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Odelius K, Finne A, Albertsson AC. Versatile and controlled synthesis of resorbable star-shaped polymers using a spirocyclic tin initiator—Reaction optimization and kinetics. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.21192] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Storey RF, Mullen BD, Desai GS, Sherman JW, Tang CN. Soluble tin(II) macroinitiator adducts for the controlled ring-opening polymerization of lactones and cyclic carbonates. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/pola.10448] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Chamberlain BM, Cheng M, Moore DR, Ovitt TM, Lobkovsky EB, Coates GW. Polymerization of lactide with zinc and magnesium beta-diiminate complexes: stereocontrol and mechanism. J Am Chem Soc 2001; 123:3229-38. [PMID: 11457057 DOI: 10.1021/ja003851f] [Citation(s) in RCA: 983] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of zinc(II) and magnesium(II) alkoxides based upon a beta-diiminate ligand framework has been prepared. [(BDI-1)ZnO(i)Pr](2) [(BDI-1) = 2-((2,6-diisopropylphenyl)amido)-4-((2,6-diisopropylphenyl)imino)-2-pentene] exhibited the highest activity and stereoselectivity of the zinc complexes studied for the polymerization of rac- and meso-lactide to poly(lactic acid) (PLA). [(BDI-1)ZnO(i)()Pr](2) polymerized (S,S)-lactide to isotactic PLA without epimerization of the monomer, rac-lactide to heterotactic PLA (P(r) = 0.94 at 0 degrees C), and meso-lactide to syndiotactic PLA (P(r) = 0.76 at 0 degrees C). The polymerizations are living, as evidenced by the narrow polydispersities of the isolated polymers in addition to the linear nature of number average molecular weight versus conversion plots and monomer-to-catalyst ratios. The substituents on the beta-diiminate ligand exert a significant influence upon the course of the polymerizations, affecting both the degree of stereoselectivity and the rate of polymerization. Kinetic studies with [(BDI-1)ZnO(i)Pr](2) indicate that the polymerizations are first order with respect to monomer (rac-lactide) and 1.56 order in catalyst. Polymerization experiments with [(BDI-1)MgO(i)Pr](2) revealed that this complex is extremely fast for the polymerization of rac-lactide, polymerizing 500 equiv in 96% yield in less than 5 min at 20 degrees C.
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Affiliation(s)
- B M Chamberlain
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA
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Dong CM, Qiu KY, Gu ZW, Feng XD. Living polymerization ofD,L-3-methylglycolide initiated with bimetallic (Al/Zn) ?-oxo alkoxide and copolymers thereof. ACTA ACUST UNITED AC 2001. [DOI: 10.1002/1099-0518(20010201)39:3<357::aid-pola1003>3.0.co;2-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Stridsberg K, Ryner M, Albertsson AC. Dihydroxy-Terminated Poly(l-lactide) Obtained by Controlled Ring-Opening Polymerization: Investigation of the Polymerization Mechanism. Macromolecules 2000. [DOI: 10.1021/ma991811u] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kajsa Stridsberg
- Department of Polymer Technology, Royal Institute of Technology, S-100 44 Stockholm, Sweden
| | - Maria Ryner
- Department of Polymer Technology, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Barakat I, Dubois P, Grandfils C, J�r�me R. Poly(?-caprolactone-b-glycolide) and poly(D,L-lactide-b-glycolide) diblock copolyesters: Controlled synthesis, characterization, and colloidal dispersions. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/1099-0518(20010115)39:2<294::aid-pola50>3.0.co;2-a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Yoshida E, Osagawa Y. Synthesis of Poly(ε-caprolactone) with a Stable Nitroxyl Radical as an End-Functional Group and Its Application to a Counter Radical for Living Radical Polymerization. Macromolecules 1998. [DOI: 10.1021/ma970944h] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eri Yoshida
- Department of Polymer Science and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Yusuke Osagawa
- Department of Polymer Science and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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Polyesters from lactides and ε-caprolactone. Dispersion polymerization versus polymerization in solution. Polym Degrad Stab 1998. [DOI: 10.1016/s0141-3910(97)00172-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Rahal A, Mas A, Elharfi A, Arcana M, Schue F. Membranes de pervaporation en polyvalérolactone et polycaprolactone testées pour la déshydratation de l'éthanol. Eur Polym J 1998. [DOI: 10.1016/s0014-3057(97)00054-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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End-functionalized poly(ϵ-caprolactone) oligomers through heterogeneous catalysis in protic conditions: a mechanistic approach. POLYMER 1997. [DOI: 10.1016/s0032-3861(97)00115-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Maeda Y, Nakayama A, Kawasaki N, Hayashi K, Aiba S, Yamamoto N. Ring-opening copolymerization of succinic anhydride with ethylene oxide initiated by magnesium diethoxide. POLYMER 1997. [DOI: 10.1016/s0032-3861(96)01088-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Boffa LS, Novak BM. “Link-Functionalized” Polymers: An Unusual Macromolecular Architecture through Bifunctional Initiation. Macromolecules 1997. [DOI: 10.1021/ma961805n] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lisa S. Boffa
- Department of Polymer Science and Engineering, and Materials Research Science and Engineering Center, University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - Bruce M. Novak
- Department of Polymer Science and Engineering, and Materials Research Science and Engineering Center, University of Massachusetts at Amherst, Amherst, Massachusetts 01003
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41
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Tian D, Dubois P, Jérôme R. Macromolecular Engineering of Polylactones and Polylactides. 23. Synthesis and Characterization of Biodegradable and Biocompatible Homopolymers and Block Copolymers Based on 1,4,8-Trioxa[4.6]spiro-9-undecanone. Macromolecules 1997. [DOI: 10.1021/ma961614k] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. Tian
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman B6, 4000 Liège, Belgium
| | - Ph. Dubois
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman B6, 4000 Liège, Belgium
| | - R. Jérôme
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman B6, 4000 Liège, Belgium
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Shen Y, Shen Z, Zhang Y, Yao K. Novel Rare Earth Catalysts for the Living Polymerization and Block Copolymerization of ε-Caprolactone. Macromolecules 1996. [DOI: 10.1021/ma9518060] [Citation(s) in RCA: 128] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Youqing Shen
- Department of Polymer Science and Engineering, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Zhiquan Shen
- Department of Polymer Science and Engineering, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Yifeng Zhang
- Department of Polymer Science and Engineering, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Kemin Yao
- Department of Polymer Science and Engineering, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China
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Gadzinowski M, Sosnowski S, Slomkowski S. Kinetics of the Dispersion Ring-Opening Polymerization of ε-Caprolactone Initiated with Diethylaluminum Ethoxide. Macromolecules 1996. [DOI: 10.1021/ma9600466] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mariusz Gadzinowski
- Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Stanislaw Sosnowski
- Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Stanislaw Slomkowski
- Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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Dubois P, Ropson N, Jérôme R, Teyssié P. Macromolecular Engineering of Polylactones and Polylactides. 19. Kinetics of Ring-Opening Polymerization of ε-Caprolactone Initiated with Functional Aluminum Alkoxides. Macromolecules 1996. [DOI: 10.1021/ma951738h] [Citation(s) in RCA: 132] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ph. Dubois
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - N. Ropson
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - R. Jérôme
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - Ph. Teyssié
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
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Duda A. Polymerization of ε-Caprolactone Initiated by Aluminum Isopropoxide Carried Out in the Presence of Alcohols and Diols. Kinetics and Mechanism. Macromolecules 1996. [DOI: 10.1021/ma951442b] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrzej Duda
- Department of Polymer Chemistry, Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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Löfgren A, Albertsson AC, Dubois P, Jérôme R. Recent Advances in Ring-Opening Polymerization of Lactones and Related Compounds. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/15321799508014594] [Citation(s) in RCA: 135] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Narula SA, Vermani O, Sharma H, Sarpal A. Synthesis of bimetallic[SnIV,AIII]-μ-oxoisopropoxyacetate and -μ-oxoisopropoxide and their acetylacetone and benzoylacetone derivatives. J Organomet Chem 1994. [DOI: 10.1016/0022-328x(94)80149-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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