1
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Hong D, Rajeshkumar T, Zhu S, Huang Z, Zhou S, Zhu X, Maron L, Wang S. Unusual selective reactivity of the rare-earth metal complexes bearing a ligand with multiple functionalities. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1396-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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2
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Huang Z, Wang S, Zhu X, Wei Y, Yuan Q, Zhou S, Mu X, Wang H. Synthesis, Characterization of
Rare‐Earth
Metal Chlorides Bearing
Indolyl‐Based NCN
Pincer Ligand and Their Catalytic Activity toward 1,4‐
cis
Polymerization of Isoprene. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202100539] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Zeming Huang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
| | - Shaowu Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
- Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, College of Chemical and Environmental Engineering Anhui Polytechnic University Wuhu Anhui 241000 China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences Shanghai 200032 China
| | - Xiancui Zhu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
| | - Yun Wei
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
| | - Qingbing Yuan
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
| | - Shuangliu Zhou
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
| | - Xiaolong Mu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
| | - Hua Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials, College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 China
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3
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Zhang Q, Song M, Xu Y, Wang W, Wang Z, Zhang L. Bio-based polyesters: Recent progress and future prospects. Prog Polym Sci 2021. [DOI: 10.1016/j.progpolymsci.2021.101430] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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4
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Shi C, Li ZC, Caporaso L, Cavallo L, Falivene L, Chen EYX. Hybrid monomer design for unifying conflicting polymerizability, recyclability, and performance properties. Chem 2021. [DOI: 10.1016/j.chempr.2021.02.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Ji M, Wu M, Han J, Zhang F, Peng H, Guo L. Recent Advances in Organocatalytic Ring-opening Polymerization. CURR ORG CHEM 2021. [DOI: 10.2174/1385272824999200917151344] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
As compared with widely used polyolefin materials, aliphatic polyesters have
been primarily used in electronics, packaging, and biomedicine owing to its unique biocompatibility
and degradability. At present, ring-opening polymerization (ROP) of lactone is the
main method to synthesize polyesters. Two types of catalysts, including metal-based catalysts
and organocatalysts, were most researched today. However, metal-based catalysts lead
to polymer materials with metal residues, which limits its properties and applications. As a
result, organocatalysts have received great attention. In this review, the progress of organocatalytic
ring-opening polymerization in the past decades was systematically summarized.
The potential challenges and development directions in this field are also discussed.
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Affiliation(s)
- Mingjun Ji
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Mengqi Wu
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Jiayu Han
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Fanjun Zhang
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Hongwei Peng
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Lihua Guo
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
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6
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Chisholm DT, Hayes PG. Synthesis and characterization of group 13 dichloride (M = Ga, In), dimethyl (M = Al) and cationic methyl aluminum complexes supported by monoanionic NNN-pincer ligands. NEW J CHEM 2021. [DOI: 10.1039/d1nj01064f] [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 series of monoanionic NNN-pincer ligands effectively stabilize five-coordinate gallium and indium dichloride complexes, as well as neutral dimethyl aluminum species, and organometallic cations thereof.
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Affiliation(s)
- Desmond T. Chisholm
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge, AB, Canada T1K 3M4
| | - Paul G. Hayes
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge, AB, Canada T1K 3M4
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7
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Schäfer PM, Herres-Pawlis S. Robust Guanidine Metal Catalysts for the Ring-Opening Polymerization of Lactide under Industrially Relevant Conditions. Chempluschem 2020; 85:1044-1052. [PMID: 32449840 DOI: 10.1002/cplu.202000252] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/30/2020] [Indexed: 01/21/2023]
Abstract
The increasing awareness of sustainability has led to enormous growth of the demand for bio-based and biodegradable polymers such as poly(lactide) (PLA). In industry, polymerization of lactide is currently carried out using tin catalysts (e. g., tin(II) ethyl hexanoate, Sn(Oct)2 ). Since the catalyst remains in the polymer, it can accumulate in the soil or in the human body after degradation and cause damage due to its toxicity. Therefore, a search for a suitable substitute for this catalyst has been going on for decades. Guanidine metal complexes prove to be excellent catalysts in the polymerization of lactide. They are not only convincing because of their activity and the synthesis of high molar mass polymers, but also show a high robustness against high temperatures, oxidation as well as residual protic impurities in the monomer. Herein, key zinc and iron guanidine complexes are discussed with respect to their apparent rate constant (kapp ) and rate constant of propagation (kp ), produced molar masses and the mechanism involved.
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Affiliation(s)
- Pascal M Schäfer
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
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8
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Fayoumi A, Lyubov DM, Tolpygin AO, Shavyrin AS, Cherkasov AV, Ob'edkov AM, Trifonov AA. Sc and Y Heteroalkyl Complexes with a NC
sp3
N Pincer‐Type Diphenylmethanido Ligand: Synthesis, Structure, and Reactivity. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000306] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ahmad Fayoumi
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
| | - Dmitry M. Lyubov
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
| | - Alexey O. Tolpygin
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
| | - Andrey S. Shavyrin
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
| | - Anton V. Cherkasov
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
| | - Anatoly M. Ob'edkov
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
| | - Alexander A. Trifonov
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street 49, GSP‐445 603950 Nizhny Novgorod Russia
- Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova Street 28 119334 Moscow Russia
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9
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Gurina GA, Kissel AA, Lyubov DM, Luconi L, Rossin A, Tuci G, Cherkasov AV, Lyssenko KA, Shavyrin AS, Ob'edkov AM, Giambastiani G, Trifonov AA. Bis(alkyl) scandium and yttrium complexes coordinated by an amidopyridinate ligand: synthesis, characterization and catalytic performance in isoprene polymerization, hydroelementation and carbon dioxide hydrosilylation. Dalton Trans 2020; 49:638-650. [DOI: 10.1039/c9dt04338a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly versatile and robust organolanthanides as catalysts or catalyst precursors for a variety of challenging transformations.
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10
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Liu X, Hong M. Transesterification by air/moisture-tolerant bifunctional organocatalyst to produce ‘nonstrained’ γ-butyrolactone-based aliphatic copolyesters: Turning a bane into a boon. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109277] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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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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12
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Pan Y, Li W, Wei NN, So YM, Li Y, Jiang K, He G. Anilido-oxazoline-ligated rare-earth metal complexes: synthesis, characterization and highly cis-1,4-selective polymerization of isoprene. Dalton Trans 2019; 48:3583-3592. [PMID: 30681102 DOI: 10.1039/c8dt04647f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Anilido-oxazoline-ligated rare-earth metal dialkyl complexes have been synthesized and structurally characterized. The complexes exhibited strong fluorescence emissions and good catalytic performance on isoprene polymerization with high cis-1,4-selectivity. The treatment of anilido-oxazoline precursors ortho-C6H4[NH(2,6-R12C6H3)][C[double bond, length as m-dash]NC(R2,R3)CH2O] (R1 = R2 = R3 = Me (HL1); R1 = iPr, R2 = R3 = Me (HL2); R1 = R2 = iPr, R3 = H (HL3); and R1 = iPr, R2 = R3 = H (HL4)) with an equimolar amount of Ln(CH2SiMe3)3(THF)2 (Ln = Sc, Y) afforded rare-earth metal complexes L1-4-Ln(CH2SiMe3)2(THF)n (L1-Sc (1), n = 1; L2-Sc (2), n = 0; L1-Y (3), n = 1; L2-Y (4), n = 1; L3-Y (5), n = 1; and L4-Y (6), n = 1) in good yields. The complexes are stable in both the solid state and solution. Single crystal X-ray diffraction study showed that complexes 1, 3 and 4 exhibit a distorted trigonal bipyramidal configuration, while complex 2 is pseudo-tetrahedral without coordinated THF. The luminescence properties of complexes 1-4 were investigated and the emission maxima were found in the range of 465-477 nm. DFT and TD-DFT studies were carried out to explore their characteristic electronic structures and gain insight into their optical properties. Upon activation with organic borates, the reported complexes exhibited high activity and cis-1,4-selectivity for isoprene polymerization. The nature of the central metal and substituent groups in oxazoline have an influence on the cis-1,4-selectivity.
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Affiliation(s)
- Yu Pan
- State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin 124221, China.
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13
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14
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Hong M, Tang X, Newell BS, Chen EYX. “Nonstrained” γ-Butyrolactone-Based Copolyesters: Copolymerization Characteristics and Composition-Dependent (Thermal, Eutectic, Cocrystallization, and Degradation) Properties. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b02174] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Miao Hong
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Xiaoyan Tang
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Brian S. Newell
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Eugene Y.-X. Chen
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
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15
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Walther P, Naumann S. N-Heterocyclic Olefin-Based (Co)polymerization of a Challenging Monomer: Homopolymerization of ω-Pentadecalactone and Its Copolymers with γ-Butyrolactone, δ-Valerolactone, and ε-Caprolactone. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01678] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Patrick Walther
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Stefan Naumann
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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16
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Cota I. Developments in the use of rare earth metal complexes as efficient catalysts for ring-opening polymerization of cyclic esters used in biomedical applications. PHYSICAL SCIENCES REVIEWS 2017. [DOI: 10.1515/psr-2016-0129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractBiodegradable polymers represent a class of particularly useful materials for many biomedical and pharmaceutical applications. Among these types of polyesters, poly(ε-caprolactone) and polylactides are considered very promising for controlled drug delivery devices. These polymers are mainly produced by ring-opening polymerization of their respective cyclic esters, since this method allows a strict control of the molecular parameters (molecular weight and distribution) of the obtained polymers. The most widely used catalysts for ring-opening polymerization of cyclic esters are tin- and aluminium-based organometalliccomplexes; however since the contamination of the aliphatic polyesters by potentially toxic metallic residues is particularly of concern for biomedical applications, the possibility of replacing organometallic initiators by novel less toxic or more efficient organometallic complexes has been intensively studied. Thus, in the recent years, the use of highly reactive rare earth initiators/catalysts leading to lower polymer contamination has been developed. The use of rare earth complexes is considered a valuable strategy to decrease the polyester contamination by metallic residues and represents an attractive alternative to traditional organometallic complexes.
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17
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Wang LJ, Peng L, Cen B, Wang YL, Tao X, Shen YZ. Synthesis and structure of para-toluene sulfonamide lanthanide complexes and their application in the polymerization of ε-caprolactone. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Li-Jun Wang
- Applied Chemistry Department, School of Material Science and Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China
| | - Ling Peng
- Applied Chemistry Department, School of Material Science and Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China
| | - Bo Cen
- Applied Chemistry Department, School of Material Science and Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China
| | - Yu-Long Wang
- Applied Chemistry Department, School of Material Science and Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China
| | - Xian Tao
- Jiangsu MO Opto-Electronic Material Co. Ltd; Qinglongshan Branch Road 1, Zhenjiang New District Zhenjiang 212132 China
| | - Ying-Zhong Shen
- Applied Chemistry Department, School of Material Science and Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China
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18
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Trifonov AA, Lyubov DM. A quarter-century long story of bis(alkyl) rare-earth (III) complexes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.09.013] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Lin B, Waymouth RM. Urea Anions: Simple, Fast, and Selective Catalysts for Ring-Opening Polymerizations. J Am Chem Soc 2017; 139:1645-1652. [DOI: 10.1021/jacs.6b11864] [Citation(s) in RCA: 158] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Binhong Lin
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Robert M. Waymouth
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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20
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Fastnacht KV, Spink SS, Dharmaratne NU, Pothupitiya JU, Datta PP, Kiesewetter ET, Kiesewetter MK. Bis- and Tris-Urea H-Bond Donors for Ring-Opening Polymerization: Unprecedented Activity and Control from an Organocatalyst. ACS Macro Lett 2016; 5:982-986. [PMID: 35607216 DOI: 10.1021/acsmacrolett.6b00527] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new class of H-bond donating ureas was developed for the ring-opening polymerization (ROP) of lactone monomers, and they exhibit dramatic rate acceleration versus previous H-bond mediated polymerization catalysts. The most active of these new catalysts, a tris-urea H-bond donor, is among the most active organocatalysts known for ROP, yet it retains the high selectivity of H-bond mediated organocatalysts. The urea cocatalyst, along with an H-bond accepting base, exhibits the characteristics of a "living" ROP, is highly active, in one case, accelerating a reaction from days to minutes, and remains active at low catalyst loadings. The rate acceleration exhibited by this H-bond donor occurs for all base cocatalysts examined. A mechanism of action is proposed, and the new catalysts are shown to accelerate small molecule transesterifications versus currently known monothiourea catalysts. It is no longer necessary to choose between a highly active or highly selective organocatalyst for ROP.
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Affiliation(s)
- Kurt V. Fastnacht
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Samuel S. Spink
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | | | - Jinal U. Pothupitiya
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Partha P. Datta
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Elizabeth T. Kiesewetter
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Matthew K. Kiesewetter
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
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21
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Thevenon A, Romain C, Bennington MS, White AJP, Davidson HJ, Brooker S, Williams CK. Dizinc Lactide Polymerization Catalysts: Hyperactivity by Control of Ligand Conformation and Metallic Cooperativity. Angew Chem Int Ed Engl 2016; 55:8680-5. [PMID: 27295339 PMCID: PMC5089563 DOI: 10.1002/anie.201602930] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Indexed: 11/08/2022]
Abstract
Understanding how to moderate and improve catalytic activity is critical to improving degradable polymer production. Here, di- and monozinc catalysts, coordinated by bis(imino)diphenylamido ligands, show remarkable activities and allow determination of the factors controlling performance. In most cases, the dizinc catalysts significantly out-perform the monozinc analogs. Further, for the best dizinc catalyst, the ligand conformation controls activity: the catalyst with "folded" ligand conformation shows turnover frequency (TOF) values up to 60 000 h(-1) (0.1 mol % loading, 298 K, [LA]=1 m), whilst that with a "planar" conformation is much slower, under similar conditions (TOF=30 h(-1) ). Dizinc catalysts also perform very well under immortal conditions, showing improved control, and are able to tolerate loadings as low as 0.002 mol % whilst conserving high activity (TOF=12 500 h(-1) ).
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Affiliation(s)
- Arnaud Thevenon
- Department of Chemistry, Imperial College London, South Kensington, UK
| | - Charles Romain
- Department of Chemistry, Imperial College London, South Kensington, UK
| | | | - Andrew J P White
- Department of Chemistry, Imperial College London, South Kensington, UK
| | | | - Sally Brooker
- Department of Chemistry, University of Otago, Dunedin, New Zealand.
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22
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23
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Thevenon A, Romain C, Bennington MS, White AJP, Davidson HJ, Brooker S, Williams CK. Dizinc Lactide Polymerization Catalysts: Hyperactivity by Control of Ligand Conformation and Metallic Cooperativity. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602930] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Arnaud Thevenon
- Department of Chemistry; Imperial College London; South Kensington UK
| | - Charles Romain
- Department of Chemistry; Imperial College London; South Kensington UK
| | | | | | | | - Sally Brooker
- Department of Chemistry; University of Otago; Dunedin New Zealand
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24
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First row transition metal complexes of di-o-substituted-diarylamine-based ligands (including carbazoles, acridines and dibenzoazepines). Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.02.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Synthesis and structure characterization of bis- and mono(amidate) lanthanide (Ln = La, Gd) complexes and their application in the polymerization of ε-caprolactone. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Cai G, Huang Y, Du T, Zhang S, Yao B, Li X. Palladium-catalyzed C(sp3)–C(sp2) cross-coupling of homoleptic rare-earth metal trialkyl complexes with aryl bromides: efficient synthesis of functionalized benzyltrimethylsilanes. Chem Commun (Camb) 2016; 52:5425-7. [DOI: 10.1039/c6cc01312k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first C(sp3)–C(sp2) cross-coupling of rare-earth metal alkyl complexes with aryl bromides has been developed for an efficient synthesis of benzyltrimethylsilanes with diverse functional groups.
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Affiliation(s)
- Guilong Cai
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Yingda Huang
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Tingting Du
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Shaowen Zhang
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Bo Yao
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Xiaofang Li
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry
- Beijing Institute of Technology
- Beijing 100081
- China
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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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28
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Malthus SJ, Wilson RK, Larsen DS, Brooker S. Acridine-based ligands from cobalt(II) mediated rearrangement of diphenylamine-based starting materials. Supramol Chem 2015. [DOI: 10.1080/10610278.2015.1091458] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Stuart J. Malthus
- Department of Chemistry and MacDiarmid, Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Rajni K. Wilson
- Department of Chemistry and MacDiarmid, Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - David S. Larsen
- Department of Chemistry and MacDiarmid, Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
| | - Sally Brooker
- Department of Chemistry and MacDiarmid, Institute for Advanced Materials and Nanotechnology, University of Otago, Dunedin, New Zealand
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Wong EWY, Emslie DJH. Cyclometalation and coupling of a rigid 4,5-bis(imino)acridanide pincer ligand on yttrium. Dalton Trans 2015; 44:11601-12. [PMID: 26041684 DOI: 10.1039/c5dt01636c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An extremely rigid NNN-donor proligand, 4,5-bis{(diphenylmethylene)amino}-2,7,9,9-tetramethylacridan, H[AIm2] was prepared in five steps starting from 5-methyl-2-aminobenzoic acid and 4-bromotoluene. Reaction of intensely orange H[AIm2] with LiCH2SiMe3 formed deep blue Li(x)[AIm2]x (x = 2 in the solid state), while reaction with [Y(CH2SiMe3)3(THF)2] (0.5 equiv.) afforded deep blue [Y(AIm2)(AIm)] (1; AIm = an AIm2 ligand cyclometalated at the ortho-position of one of the phenyl rings). Compound 1 slowly isomerizes to form green-brown 2, which contains a single trianionic, hexadentate ligand that features one amine, two imine, and three amido donors. The acridanide backbone and one imine group in each of the original AIm2 ligands is intact, but the two acridanide backbones are now linked by an isoindoline heterocycle. Yttrium in 2 is coordinated to six nitrogen donors and the ortho carbon of an isoindoline phenyl substituent. The intense colours of H[AIm2], Li(x)[AIm2]x and 1 were shown by TD-DFT calculations to arise from charge transfer transitions from the HOMO, which is localized on the acridanide ligand backbone, to the LUMO and LUMO+1, which are localized on the imine substituents. The conversion of 1 to 2 was studied by UV-Visible absorption spectroscopy and is first-order with a half-life of 7.8 hours at room temperature.
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Affiliation(s)
- Edwin W Y Wong
- Department of Chemistry & Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.
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30
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Guo L, Zhu X, Zhang G, Wei Y, Ning L, Zhou S, Feng Z, Wang S, Mu X, Chen J, Jiang Y. Synthesis and Characterization of Organo-Rare-Earth Metal Monoalkyl Complexes Supported by Carbon σ-Bonded Indolyl Ligands: High Specific Isoprene 1,4-Cis Polymerization Catalysts. Inorg Chem 2015; 54:5725-31. [DOI: 10.1021/acs.inorgchem.5b00308] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Shaowu Wang
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People’s Republic of China
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31
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Edelmann FT. Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2013. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.09.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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32
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Hänninen MM, Zamora MT, Hayes PG. Rare Earth Pincer Complexes: Synthesis, Reaction Chemistry, and Catalysis. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/3418_2015_120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Altenbuchner PT, Soller BS, Kissling S, Bachmann T, Kronast A, Vagin SI, Rieger B. Versatile 2-Methoxyethylaminobis(phenolate)yttrium Catalysts: Catalytic Precision Polymerization of Polar Monomers via Rare Earth Metal-Mediated Group Transfer Polymerization. Macromolecules 2014. [DOI: 10.1021/ma501754u] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Peter T. Altenbuchner
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
| | - Benedikt S. Soller
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
| | - Stefan Kissling
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
| | - Thomas Bachmann
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
| | - Alexander Kronast
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
| | - Sergei I. Vagin
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
| | - Bernhard Rieger
- WACKER-Lehrstuhl für
Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße
4, 85748 Garching
bei München, Germany
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34
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Wang YL, Zhou YX, Deng LQ, Hu QS, Tao X, Shen YZ. Synthesis, structure, and catalytic activity of lanthanide Gd(III) and La(III) complexes with N-(cyclohexyl)isopropyl amidate ligand. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.847184] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Yu-Long Wang
- Applied Chemistry Department, School of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, P.R. China
| | - Yan-Xu Zhou
- Applied Chemistry Department, School of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, P.R. China
| | - Le-Qing Deng
- Applied Chemistry Department, School of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, P.R. China
| | - Qing-Song Hu
- Applied Chemistry Department, School of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, P.R. China
| | - Xian Tao
- Applied Chemistry Department, School of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, P.R. China
| | - Ying-Zhong Shen
- Applied Chemistry Department, School of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, P.R. China
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