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Yi W, Ma H. Magnesium complexes containing biphenyl-based tridentate imino-phenolate ligands for ring-opening polymerization of rac-lactide and α-methyltrimethylene carbonate. Dalton Trans 2014; 43:5200-10. [PMID: 24504319 DOI: 10.1039/c3dt53513d] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of racemic 2-[(2'-(dimethylamino)biphenyl-2-ylimino)methyl]-4-R(2)-6-R(1)-phenols (L¹H-L⁴H) were reacted with {Mg[N(SiMe3)2]2}2 to provide four heteroleptic magnesium complexes (L¹⁻⁴)MgN(SiMe3)2·(THF)n (1, R(1) = (t)Bu, R(2) = Me, n = 1; 2, R(1) = R(2) = CMe2Ph, n = 0; 3, R(1) = CPh3, R(2) = (t)Bu, n = 1; 4, R(1) = Br, R(2) = (t)Bu, n = 0), which have been fully characterized. X-ray structural determination shows that complex 1 possesses a monomeric structure, but complex 4 is dimeric with C2-symmetry where the two metal centers are bridged by two phenolate oxygen atoms of the ligands. The coordination geometry around the magnesium center in these complexes can be best described as a distorted tetrahedral geometry. The heteroleptic complexes 1-4 efficiently initiate the ring-opening polymerization of rac-lactide and α-methyltrimethylene carbonate (α-MeTMC) and the polymerizations are better controlled in the presence of 2-propanol. In general, the introduction of a bulky ortho-substituent on the phenoxy unit results in increases of both the catalytic activity and the stereo- or regioselectivity of the corresponding magnesium complex. Microstructure analyses of the resulting PLAs revealed that P(r) values range from 0.46 to 0.81, depending on the catalyst and the polymerization conditions. For racemic α-MeTMC, detailed analyses using (1)H and (13)C NMR spectroscopy indicated the preferential ring-opening of α-MeTMC at the most hindered oxygen-acyl bond (X(reg) = 0.65-0.86).
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Affiliation(s)
- Wei Yi
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
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52
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Fliedel C, Mameri S, Dagorne S, Avilés T. Controlled ring-opening polymerization of trimethylene carbonate and access to PTMC-PLA block copolymers mediated by well-definedN-heterocyclic carbene zinc alkoxides. Appl Organomet Chem 2014. [DOI: 10.1002/aoc.3154] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Christophe Fliedel
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Caparica 2829-516 Portugal
- Institut de Chimie de Strasbourg; CNRS-Université de Strasbourg; 67000 Strasbourg France
| | - Samir Mameri
- Institut de Chimie de Strasbourg; CNRS-Université de Strasbourg; 67000 Strasbourg France
| | - Samuel Dagorne
- Institut de Chimie de Strasbourg; CNRS-Université de Strasbourg; 67000 Strasbourg France
| | - Teresa Avilés
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Caparica 2829-516 Portugal
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53
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Maudoux N, Roisnel T, Dorcet V, Carpentier JF, Sarazin Y. Chiral (1,2)-Diphenylethylene-Salen Complexes of Triel Metals: Coordination Patterns and Mechanistic Considerations in the Isoselective ROP of Lactide. Chemistry 2014; 20:6131-47. [DOI: 10.1002/chem.201304788] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Indexed: 11/06/2022]
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54
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Wang L, Poirier V, Ghiotto F, Bochmann M, Cannon RD, Carpentier JF, Sarazin Y. Kinetic Analysis of the Immortal Ring-Opening Polymerization of Cyclic Esters: A Case Study with Tin(II) Catalysts. Macromolecules 2014. [DOI: 10.1021/ma500124k] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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
| | - Valentin Poirier
- Organometallics: Materials and Catalysis,
Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - Fabio Ghiotto
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich NR4 7TJ, U.K
| | - Manfred Bochmann
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich NR4 7TJ, U.K
| | - Roderick D. Cannon
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich NR4 7TJ, U.K
| | - 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
| | - 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
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55
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Fliedel C, Vila-Viçosa D, Calhorda MJ, Dagorne S, Avilés T. Dinuclear Zinc-N-Heterocyclic Carbene Complexes for Either the Controlled Ring-Opening Polymerization of Lactide or the Controlled Degradation of Polylactide Under Mild Conditions. ChemCatChem 2014. [DOI: 10.1002/cctc.201301015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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56
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Zaitsev KV, Piskun YA, Oprunenko YF, Karlov SS, Zaitseva GS, Vasilenko IV, Churakov AV, Kostjuk SV. Controlled ring‐opening homo‐ and copolymerization of ɛ‐caprolactone and
d,l
‐lactide by iminophenolate aluminum complexes: An efficient approach toward well‐defined macromonomers. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27110] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Kirill V. Zaitsev
- Department of ChemistryMoscow State UniversityLeninskye Gory 1Moscow119991 Russia
| | - Yulia A. Piskun
- Research Institute for Physical Chemical Problems of the Belarusian State UniversityLeningradskaya St., 14Minsk220030 Belarus
| | - Yuri F. Oprunenko
- Department of ChemistryMoscow State UniversityLeninskye Gory 1Moscow119991 Russia
| | - Sergey S. Karlov
- Department of ChemistryMoscow State UniversityLeninskye Gory 1Moscow119991 Russia
| | - Galina S. Zaitseva
- Department of ChemistryMoscow State UniversityLeninskye Gory 1Moscow119991 Russia
| | - Irina V. Vasilenko
- Research Institute for Physical Chemical Problems of the Belarusian State UniversityLeningradskaya St., 14Minsk220030 Belarus
| | - Andrei V. Churakov
- Russian Academy Science, N.S. Kurnakov General and Inorganic Chemistry InstituteLeninskii pr., 31Moscow119991 Russia
| | - Sergei V. Kostjuk
- Research Institute for Physical Chemical Problems of the Belarusian State UniversityLeningradskaya St., 14Minsk220030 Belarus
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57
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Wang L, Roşca SC, Poirier V, Sinbandhit S, Dorcet V, Roisnel T, Carpentier JF, Sarazin Y. Stable divalent germanium, tin and lead amino(ether)-phenolate monomeric complexes: structural features, inclusion heterobimetallic complexes, and ROP catalysis. Dalton Trans 2014; 43:4268-86. [PMID: 23969845 DOI: 10.1039/c3dt51681d] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Lingfang Wang
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - University of Rennes 1, 35042 Cedex, Rennes, France.
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58
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Gao Y, Dai Z, Zhang J, Ma X, Tang N, Wu J. Trinuclear and Tetranuclear Magnesium Alkoxide Clusters as Highly Active Initiators for Ring-Opening Polymerization of l-Lactide. Inorg Chem 2013; 53:716-26. [DOI: 10.1021/ic401459a] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yuan Gao
- Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Zhongran Dai
- Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Jinjin Zhang
- Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Xinxian Ma
- Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Ning Tang
- Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Jincai Wu
- Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, State
Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
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59
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Gao B, Duan R, Pang X, Li X, Qu Z, Tang Z, Zhuang X, Chen X. Stereoselective Ring-Opening Polymerization of rac-Lactides Catalyzed by Aluminum Hemi-Salen Complexes. Organometallics 2013. [DOI: 10.1021/om400714q] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Bo Gao
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Ranlong Duan
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Xuan Pang
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Xiang Li
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Zhi Qu
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Zhaohui Tang
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Xiuli Zhuang
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
| | - Xuesi Chen
- Key Laboratory of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
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60
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Liu B, Roisnel T, Carpentier JF, Sarazin Y. Heteroleptic alkyl and amide iminoanilide alkaline earth and divalent rare earth complexes for the catalysis of hydrophosphination and (cyclo)hydroamination reactions. Chemistry 2013; 19:13445-62. [PMID: 23955798 DOI: 10.1002/chem.201301464] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Indexed: 11/10/2022]
Abstract
[{N^N}M(X)(thf)n] alkyl (X=CH(SiMe3)2) and amide (X=N(SiMe3)2) complexes of alkaline earths (M=Ca, Sr, Ba) and divalent rare earths (Yb(II) and Eu(II) ) bearing an iminoanilide ligand ({N^N}(-)) are presented. Remarkably, these complexes proved to be kinetically stable in solution. X-ray diffraction studies allowed us to establish size-structure trends. Except for one case of oxidation with [{N^N}Yb(II){N(SiMe3)2}(thf)], all these complexes are stable under the catalytic conditions and constitute effective precatalysts for the cyclohydroamination of terminal aminoalkenes and the intermolecular hydroamination and intermolecular hydrophosphination of activated alkenes. Metals with equal sizes across alkaline earth and rare earth families display almost identical apparent catalytic activity and selectivity. Hydrocarbyl complexes are much better catalyst precursors than their amido analogues. In the case of cyclohydroamination, the apparent activity decreases with metal size: Ca>Sr>Ba, and the kinetic rate law agrees with R(CHA) =k[precatalyst](1)[aminoalkene](1). The intermolecular hydroamination and hydrophosphination of styrene are anti-Markovnikov regiospecific. In both cases, the apparent activity increases with the ionic radius (Ca<Sr<Ba) but the rate laws are different, and obey R(HA) =k[styrene](1)[amine](1)[precatalyst](1) and R(HP) =k[styrene](1)[HPPh2 ](0)[precatalyst](1), respectively. Mechanisms compatible with the rate laws and kinetic isotopic effects are proposed. [{N^N}Ba{N(SiMe3)2}(thf)2] (3) and [{N^N}Ba{CH(SiMe3)2}(thf)2] (10) are the first efficient Ba-based precatalysts for intermolecular hydroamination and hydrophosphination, and display activity values that are above those reported so far. The potential of the precatalysts for C-N and C-P bond formation is detailed and a rare cyclohydroamination-intermolecular hydroamination "domino" sequence is presented.
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Affiliation(s)
- Bo Liu
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France), Fax: (+33) 223-236-939
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61
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Wang L, Kefalidis CE, Sinbandhit S, Dorcet V, Carpentier JF, Maron L, Sarazin Y. Heteroleptic tin(II) initiators for the ring-opening (co)polymerization of lactide and trimethylene carbonate: mechanistic insights from experiments and computations. Chemistry 2013; 19:13463-78. [PMID: 23955851 DOI: 10.1002/chem.201301751] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Indexed: 11/10/2022]
Abstract
The tin(II) complexes {LO(x)}Sn(X) ({LO(x)}(-) =aminophenolate ancillary) containing amido (1-4), chloro (5), or lactyl (6) coligands (X) promote the ring-opening polymerization (ROP) of cyclic esters. Complex 6, which models the first insertion of L-lactide, initiates the living ROP of L-LA on its own, but the amido derivatives 1-4 require the addition of alcohol to do so. Upon addition of one to ten equivalents of iPrOH, precatalysts 1-4 promote the ROP of trimethylene carbonate (TMC); yet, hardly any activity is observed if tert-butyl (R)-lactate is used instead of iPrOH. Strong inhibition of the reactivity of TMC is also detected for the simultaneous copolymerization of L-LA and TMC, or for the block copolymerization of TMC after that of L-LA. Experimental and computational data for the {LO(x)}Sn(OR)complexes (OR=lactyl or lactidyl) replicating the active species during the tin(II)-mediated ROP of L-LA demonstrate that the formation of a five-membered chelate is largely favored over that of an eight-membered one, and that it constitutes the resting state of the catalyst during this (co)polymerization. Comprehensive DFT calculations show that, out of the four possible monomer insertion sequences during simultaneous copolymerization of L-LA and TMC: 1) TMC then TMC, 2) TMC then L-LA, 3) L-LA then L-LA, and 4) L-LA then TMC, the first three are possible. By contrast, insertion of L-LA followed by that of TMC (i.e., insertion sequence 4) is endothermic by +1.1 kcal mol(-1), which compares unfavorably with consecutive insertions of two L-LA units (i.e., insertion sequence 3) (-10.2 kcal mol(-1)). The copolymerization of L-LA and TMC thus proceeds under thermodynamic control.
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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)
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62
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Schnee G, Fliedel C, Avilés T, Dagorne S. Neutral and Cationic N-Heterocyclic Carbene Zinc Adducts and the BnOH/Zn(C6F5)2Binary Mixture - Characterization and Use in the Ring-Opening Polymerization of β-Butyrolactone, Lactide, and Trimethylene Carbonate. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300292] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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63
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Roşca SC, Roşca DA, Dorcet V, Kozak CM, Kerton FM, Carpentier JF, Sarazin Y. Alkali aminoether-phenolate complexes: synthesis, structural characterization and evidence for an activated monomer ROP mechanism. Dalton Trans 2013; 42:9361-75. [PMID: 23334495 DOI: 10.1039/c2dt32726k] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several monometallic {LO(i)}M complexes of lithium (M = Li; i = 1 (1), 2 (2), 3 (3)) or potassium (M = K, i = 3 (4)) and the heteroleptic bimetallic lithium complex {LO(3)}Li·LiN(SiMe2H)2 (5), all supported by monoanionic aminoether-phenolate {LO(i)}(-) (i = 1-3) ligands, have been synthesized and structurally characterized. A large range of coordination motifs is represented in the solid state, depending on the chelating ability of the ligand, the size of the metal and the number of metallic centres found in the complex. Pulse-gradient spin-echo NMR showed that 1-4 are monomeric in solution, irrespective of their (mono- or di)nuclearity in the solid-state. VT (7)Li and DOSY NMR measurements conducted for 5 indicated that the two Li atoms in the complex do not exchange positions even at 80 °C. Upon addition of 1-10 equiv. of BnOH, the electron-rich and sterically congested {LO(3)}Li complex (3) promotes the controlled living and immortal ring-opening polymerisation of L-lactide. The combination of polymer end-group analyses and stoichiometric model reactions unambiguously provided evidence that ROP reactions catalyzed by these two-component {LO(i)}Li/BnOH catalyst systems operate according to an activated monomer mechanism, and not via the coordination-insertion scenario frequently assumed for similar alkali phenolate-alcohol systems.
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Affiliation(s)
- Sorin-Claudiu Roşca
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, 263 avenue du Général Leclerc, 35042 Cedex, Rennes, France
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64
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Gao B, Duan R, Pang X, Li X, Qu Z, Shao H, Wang X, Chen X. Zinc complexes containing asymmetrical N,N,O-tridentate ligands and their application in lactide polymerization. Dalton Trans 2013; 42:16334-42. [DOI: 10.1039/c3dt52016a] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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