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Lin WS, Kuwata S. Recent Developments in Reactions and Catalysis of Protic Pyrazole Complexes. Molecules 2023; 28:molecules28083529. [PMID: 37110763 PMCID: PMC10143336 DOI: 10.3390/molecules28083529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
Protic pyrazoles (N-unsubstituted pyrazoles) have been versatile ligands in various fields, such as materials chemistry and homogeneous catalysis, owing to their proton-responsive nature. This review provides an overview of the reactivities of protic pyrazole complexes. The coordination chemistry of pincer-type 2,6-bis(1H-pyrazol-3-yl)pyridines is first surveyed as a class of compounds for which significant advances have made in the last decade. The stoichiometric reactivities of protic pyrazole complexes with inorganic nitrogenous compounds are then described, which possibly relates to the inorganic nitrogen cycle in nature. The last part of this article is devoted to outlining the catalytic application of protic pyrazole complexes, emphasizing the mechanistic aspect. The role of the NH group in the protic pyrazole ligand and resulting metal-ligand cooperation in these transformations are discussed.
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Affiliation(s)
- Wei-Syuan Lin
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shigeki Kuwata
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu 525-8577, Shiga, Japan
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Liu T, Wang L, Wu K, Wang Q, Yu Z. Mono- and multinuclear pincer-type Ru(II) complex catalysts and their catalytic applications. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2023.121458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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3
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Poly((3,5-dimethylpyrazol-1-yl)methyl)benzene ligands: synthesis, crystal structure and catecholase activities. Struct Chem 2022. [DOI: 10.1007/s11224-022-02014-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Nishijo M, Mori S, Nishimura T, Shinokubo H, Miyake Y. Stepwise N-Methylation of Ruthenium and Cobalt 5,15-Diazaporphyrins: Post-Functionalization of Porphyrinoid Catalysts. Chem Asian J 2022; 17:e202200305. [PMID: 35513348 DOI: 10.1002/asia.202200305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/15/2022] [Indexed: 11/08/2022]
Abstract
Post-functionalization of porphyrinoid catalysts provides a powerful tool for fine-tuning their electronic structure. We have succeeded in the stepwise methylation of the peripheral nitrogen atoms in ruthenium and cobalt 5,15-diazaporphyrins. The axial coordination of an anion to the metal center accelerates the second methylation through charge neutralization. N-Methylation of the diazaporphyrin complexes effectively controls their electron deficiency, Lewis acidity, and catalytic activity.
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Affiliation(s)
- Mayu Nishijo
- Nagoya University: Nagoya Daigaku, Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, JAPAN
| | - Shiho Mori
- Nagoya University: Nagoya Daigaku, Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, JAPAN
| | - Tsubasa Nishimura
- Nagoya University: Nagoya Daigaku, Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, JAPAN
| | - Hiroshi Shinokubo
- Nagoya University: Nagoya Daigaku, Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, JAPAN
| | - Yoshihiro Miyake
- Nagoya University, Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Furo-cho, 464-8603, Nagoya, JAPAN
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Das K, Barman MK, Maji B. Advancements in multifunctional manganese complexes for catalytic hydrogen transfer reactions. Chem Commun (Camb) 2021; 57:8534-8549. [PMID: 34369488 DOI: 10.1039/d1cc02512k] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Catalytic hydrogen transfer reactions have enormous academic and industrial applications for the production of diverse molecular scaffolds. Over the past few decades, precious late transition-metal catalysts were employed for these reactions. The early transition metals have recently gained much attention due to their lower cost, less toxicity, and overall sustainability. In this regard, manganese, which is the third most abundant transition metal in the Earth's crust, has emerged as a viable alternative. However, the key to the success of such manganese-based complexes lies in the multifunctional ligand design and choice of appropriate ancillary ligands, which helps them mimic and, even in some cases, supersede noble metals' activities. The metal-ligand bifunctionality, achieved via deprotonation of the acidic C-H or N-H bonds, is one of the powerful strategies employed for this purpose. Alongside, the ligand hemilability in which a weakly chelating group tunes in between the coordinated and uncoordinated stages could effectively stabilize the reactive intermediates, thereby facilitating substrate activation and catalysis. Redox non-innocent ligands acting as an electron sink, thereby helping the metal center in steps gaining or losing electrons, and non-classical metal-ligand cooperativity has also played a significant role in the ligand design for manganese catalysis. The strategies were not only employed for the chemoselective hydrogenation of different reducible functionalities but also for the C-X (X = C/N) coupling reactions via HT and downstream cascade processes. This article features multifunctional ligand-based manganese complexes, highlighting the importance of ligand design and choice of ancillary ligands for achieving the desired catalytic activity and selectivity for HT reactions. We have also discussed the detailed reaction pathways for metal complexes involving bifunctionality, hemilability, redox activity, and indirect metal-ligand cooperativity. The synthetic utilization of those complexes in different organic transformations has also been detailed.
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Affiliation(s)
- Kuhali Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India.
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Barakat A, El‐Faham A, Haukka M, Al‐Majid AM, Soliman SM. s
‐Triazine pincer ligands: Synthesis of their metal complexes, coordination behavior, and applications. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6317] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Assem Barakat
- Department of Chemistry, College of Science King Saud University PO Box 2455 Riyadh 11451 Saudi Arabia
- Department of Chemistry, Faculty of Science Alexandria University PO Box 426, Ibrahimia Alexandria 21321 Egypt
| | - Ayman El‐Faham
- Department of Chemistry, College of Science King Saud University PO Box 2455 Riyadh 11451 Saudi Arabia
- Department of Chemistry, Faculty of Science Alexandria University PO Box 426, Ibrahimia Alexandria 21321 Egypt
| | - Matti Haukka
- Department of Chemistry University of Jyväskylä PO Box 35 Jyväskylä FI‐40014 Finland
| | | | - Saied M. Soliman
- Department of Chemistry, Faculty of Science Alexandria University PO Box 426, Ibrahimia Alexandria 21321 Egypt
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Toda T, Kuwata S. Synthesis, Structures, and Reactivities of Iron Complexes Bearing an Isoindoline‐Based, Polyprotic Pincer‐Type Pyrazole Ligand. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Tatsuro Toda
- Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan
| | - Shigeki Kuwata
- Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 E4-1 O-okayama Meguro-ku Tokyo 152-8552 Japan
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Saha S, Sahil ST, Mazumder MMR, Stephens AM, Cronin B, Duin EC, Jurss JW, Farnum BH. Synthesis, characterization, and electrocatalytic activity of bis(pyridylimino)isoindoline Cu(ii) and Ni(ii) complexes. Dalton Trans 2021; 50:926-935. [DOI: 10.1039/d0dt03030a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Similar structure observed between Cu(ii) and Ni(ii) based bis(pyridylimino)isoindole complexes, yet greatly different levels of catalytic activity.
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Affiliation(s)
- Soumen Saha
- Department of Chemistry and Biochemistry
- Auburn University
- Auburn
- USA
| | - Sha Tamanna Sahil
- Department of Chemistry and Biochemistry
- University of Mississippi
- University
- USA
| | | | | | - Bryan Cronin
- Department of Chemistry and Biochemistry
- Auburn University
- Auburn
- USA
| | - Evert C. Duin
- Department of Chemistry and Biochemistry
- Auburn University
- Auburn
- USA
| | - Jonah W. Jurss
- Department of Chemistry and Biochemistry
- University of Mississippi
- University
- USA
| | - Byron H. Farnum
- Department of Chemistry and Biochemistry
- Auburn University
- Auburn
- USA
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Labrum NS, Curtin GM, Jakubikova E, Caulton KG. The Influence of Nucleophilic and Redox Pincer Character as well as Alkali Metals on the Capture of Oxygen Substrates: The Case of Chromium(II). Chemistry 2020; 26:9547-9555. [PMID: 32189384 DOI: 10.1002/chem.202000457] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/16/2020] [Indexed: 11/10/2022]
Abstract
Dimeric [CrL]2 , where L is the conjugate base of bis-pyrazolyl pyridine, is evaluated for its ability to undergo inner sphere and outer sphere redox chemistry. It reacts with Cp2 Fe+ to give [Cr4 (HL)4 (μ4 -O)]2+ , still containing divalent Cr. Reduction (KC8 ) of [CrL]2 by two electrons gives [K2 (THF)3 Cr3 L3 (μ3 -O)], and by four electrons gives [K4 (THF)10 Cr2 L2 (μ-O)], each of which has scavenged (hydr)oxide from glass surface because of the electrophilicity of the underligated Cr. [K4 (THF)10 Cr2 L2 (μ-O)], is shown by comprehensive DFT calculations and analysis of intra-ligand bond lengths to contain a pyridyl radical L3- and CrII , illustrating that this pincer is proton-responsive, redox active, and a versatile donor to associated K+ ions here. The K+ electrophiles interact with electron-rich oxo, but do not significantly (>5 kcal mol-1 ) alter spin state energies. Inner sphere oxidation of [CrL]2 with a quinone gives [Cr2 L2 (semiquinone)2 ], while pre-reduced [CrL]2 2- reacts with quinone to give [K3 (THF)3 Cr2 L2 (catecholate)2 (μ-OH)], a product of capture of two undercoordinated LCr(catecholate)1- by hydroxide.
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Affiliation(s)
- Nicholas S Labrum
- Department of Chemistry, Indiana University, Bloomington, Indiana, 47405, USA
| | - Gregory M Curtin
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695, USA
| | - Elena Jakubikova
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina, 27695, USA
| | - Kenneth G Caulton
- Department of Chemistry, Indiana University, Bloomington, Indiana, 47405, USA
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Kiernicki JJ, Zeller M, Szymczak NK. Examining the Generality of Metal-Ligand Cooperativity Across a Series of First-Row Transition Metals: Capture, Bond Activation, and Stabilization. Inorg Chem 2020; 59:9279-9286. [PMID: 32551605 PMCID: PMC7340558 DOI: 10.1021/acs.inorgchem.0c01163] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We outline the generality and requirements for cooperative N2H4 capture, N-N bond scission, and amido stabilization across a series of first-row transition metal complexes bearing a pyridine(dipyrazole) ligand. This ligand contains a pair of flexibly tethered trialkylborane Lewis acids that enable hydrazine capture and M-NH2 stabilization. While the Lewis acids are required to bind N2H4, the identity of the metal dictates whether N-N bond scission can occur. The redox properties of the M(II) bis(amidoborane) series of complexes were investigated and reveal that ligand-based events prevail; oxidation results in the generation of a transiently formed aminyl radical, while reduction occurs at the redox-active pyridine(dipyrazole) ligand.
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Affiliation(s)
- John J. Kiernicki
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Matthias Zeller
- H. C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Nathaniel K. Szymczak
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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11
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Toda T, Kuwata S. Central N-heterocyclic carbene moieties in protic pincer-type bis(pyrazole) ligands: Perturbation on steric and electronic properties of ruthenium center. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121270] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Nikovsky IA, Polezhaev AV, Melnikova EK, Nelyubina Y. New Iron(III) Oxo Complex with Substituted 2,6-Bis(Pyrazol-3-yl)Pyridine. RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023620060145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Recent advances in the chemistry of group 9—Pincer organometallics. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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14
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Mohammadnezhad G, Abad S, Farrokhpour H. Theoretical Evaluation of One-Pot Synthesis of Aliphatic PNP Pincer Ligands. J STRUCT CHEM+ 2019. [DOI: 10.1134/s0022476619110052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Labrum NS, Caulton KG. [Cr(pincer 2-)] 2 as an electron shuttle for reductively promoted hydrazine disproportionation. Dalton Trans 2019; 48:11642-11646. [PMID: 31310268 DOI: 10.1039/c9dt02300c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We describe here delivery of hydrazine to a reducing, low oxidation state chromium bound to a proton responsive ligand which has already been deprotonated. Reaction of PhHNNH2 at a 4 : 1 mole ratio with the bis-(pyrazolate)pyridyl pincer ligated reducing agent [CrIIL]2 gives prompt conversion to [CrL2(PhNH2)2(μ-PhHNN)], with release of NH3 and C6H6, a new disproportionation of the hydrazine, with trapping of PhHNN as its dianion, bridging the two chromium centers. The redox balance of the reaction is discussed, and participation by Brønsted basic sites on the bis-(pyrazolate)pyridyl pincer ligand L2- is suggested, but no hydrazine protons remain on the pincer in the product.
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Labrum NS, Pink M, Chen C, Caulton KG. Reactivity of an Unusual Divalent Chromium Aggregate Supported by a Multifunctional Bis(pyrazolate) Pincer Ligand. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nicholas S. Labrum
- Department of Chemistry and the Molecular Structure Center Indiana University Bloomington 47405 Indiana USA
| | - Maren Pink
- Department of Chemistry and the Molecular Structure Center Indiana University Bloomington 47405 Indiana USA
| | - Chun‐Hsing Chen
- Department of Chemistry and the Molecular Structure Center Indiana University Bloomington 47405 Indiana USA
| | - Kenneth G. Caulton
- Department of Chemistry and the Molecular Structure Center Indiana University Bloomington 47405 Indiana USA
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Labrum NS, Seo J, Chen CH, Pink M, Beagan DM, Caulton KG. Di- and trivalent chromium bis(pyrazol-3-yl)pyridine pincer complexes with good leaving groups. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.11.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Kaur-Ghumaan S, Hasche P, Spannenberg A, Beweries T. Nickel(ii) PE1CE2P pincer complexes (E = O, S) for electrocatalytic proton reduction. Dalton Trans 2019; 48:16322-16329. [DOI: 10.1039/c9dt03626a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The catalytic activity of a series of nickel complexes with different phosphinite/thiophosphinite ligands for electrocatalytic proton reduction strongly depends on the nature of the pincer ligands.
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Affiliation(s)
- Sandeep Kaur-Ghumaan
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
- Department of Chemistry
- University of Delhi (North Campus)
| | - Patrick Hasche
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - Torsten Beweries
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
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A new face for bis(pyrazol-3-yl)pyridine: Incompatible geometric preferences dictates unprecedented pincer ligand connectivity. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.09.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Toda T, Suzuki S, Kuwata S. Metallo-supramolecular assembly of protic pincer-type complexes: encapsulation of dinitrogen and carbon disulfide into a multiproton-responsive diruthenium cage. Chem Commun (Camb) 2019; 55:1028-1031. [DOI: 10.1039/c8cc08384c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A protic pincer complex and rigid diphosphine linker formed a cage, which incorporated N2 and CS2 into the multiproton-responsive cavity.
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Affiliation(s)
- Tatsuro Toda
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - Satoshi Suzuki
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Meguro-ku
- Japan
| | - Shigeki Kuwata
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Meguro-ku
- Japan
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Selective catalytic oxidation of aromatic substrates employing mononuclear copper(II) catalyst with H2O2. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.11.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Cook BJ, Pink M, Chen C, Caulton KG. Electrophile Recruitment as a Structural Element in Bis‐Pyrazolate Pyridine Complex Aggregation. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800689] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Brian J. Cook
- Department of Chemistry Indiana University‐Bloomington 800 E Kirkwood Avenue 47405 Bloomington IN USA
| | - Maren Pink
- Department of Chemistry Indiana University‐Bloomington 800 E Kirkwood Avenue 47405 Bloomington IN USA
- Indiana University Molecular Structure Center Indiana University‐Bloomington 800 E Kirkwood Avenue 47405 Bloomington IN USA
| | - Chun‐Hsing Chen
- Department of Chemistry Indiana University‐Bloomington 800 E Kirkwood Avenue 47405 Bloomington IN USA
- Indiana University Molecular Structure Center Indiana University‐Bloomington 800 E Kirkwood Avenue 47405 Bloomington IN USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University‐Bloomington 800 E Kirkwood Avenue 47405 Bloomington IN USA
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Cook BJ, Polezhaev AV, Chen CH, Pink M, Caulton KG. A multimetal-ligand cooperative approach to CO2 activation. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.08.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Shi J, Hu B, Ren P, Shang S, Yang X, Chen D. Synthesis and Reactivity of Metal–Ligand Cooperative Bifunctional Ruthenium Hydride Complexes: Active Catalysts for β-Alkylation of Secondary Alcohols with Primary Alcohols. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00432] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Jing Shi
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Bowen Hu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Peng Ren
- School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, People’s Republic of China
| | - Shu Shang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Xinzheng Yang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Dafa Chen
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
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Lawrence MAW, Mulder WH. SNS versus SNN Pincer Ligands: Electrochemical Studies and Their Palladium(II) Complexes as Electro-Catalyst for Proton Reduction. ChemistrySelect 2018. [DOI: 10.1002/slct.201802065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Mark A. W. Lawrence
- Department of Chemistry; University of the West Indies, Mona Kingston 7; Jamaica W.I
- School of Natural and Applied Sciences; University of Technology; 237 Old Hope Road Kingston 6 Jamaica W.I
| | - Willem H. Mulder
- Department of Chemistry; University of the West Indies, Mona Kingston 7; Jamaica W.I
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Cook BJ, Chen CH, Caulton KG. A Multifunctional Pincer Ligand for Cobalt-Promoted Oxidation by N 2 O. Chemistry 2018; 24:5962-5966. [PMID: 29437249 DOI: 10.1002/chem.201800086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Indexed: 12/22/2022]
Abstract
The divalent cobalt complex of the diprotic pincer ligand bis-pyrazolylpyridine, (H2 L)CoCl2 , is dehydrohalogenated twice by LiN(SiMe3 )2 in the presence of PEt3 to give monomeric S=1/2 LCo(PEt3 )2 (1), fully characterized in the solid-state and solution as a square pyramidal monomer with a long axial Co-P bond. This 17-electron species reacts in time of mixing with N2 O to form L2 Co2 (μ-OPEt3 ) (2)+3 OPEt3 , the former the first example of phosphine oxide bridging two transition metals. The same products are formed from O2 , and divalent cobalt persists even in the presence of excess oxidant. Species (2) catalyzes oxygen atom transfer (OAT) for generation of O=PEt3 from PEt3 from either N2 O or O2 . Bridging and terminal cobalt oxo intermediates are suggested, and the electron donor power, and potential redox activity of the dianionic pincer ligand is emphasized.
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Affiliation(s)
- Brian J Cook
- Department of Chemistry, Indiana University, 800 E Kirkwood Ave, Bloomington, IN, 47405, USA
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University, 800 E Kirkwood Ave, Bloomington, IN, 47405, USA.,Molecular Structure Center, Indiana University, 800 E Kirkwood Ave, Bloomington, IN, 47405, USA
| | - Kenneth G Caulton
- Department of Chemistry, Indiana University, 800 E Kirkwood Ave, Bloomington, IN, 47405, USA
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27
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Lawrence MA, Green KA, Nelson PN, Lorraine SC. Review: Pincer ligands—Tunable, versatile and applicable. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.08.017] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Nakahara Y, Toda T, Kuwata S. Iron and ruthenium complexes having a pincer-type ligand with two protic amidepyrazole arms: Structures and catalytic application. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.08.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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29
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Cook BJ, Chen CH, Pink M, Caulton KG. Dehydrohalogenation of proton responsive complexes: versatile aggregation via pyrazolate pincer ligand arms. Dalton Trans 2018; 47:2052-2060. [DOI: 10.1039/c7dt04253a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The behavior of the complex (H2L)CoCl2, where H2L is a bis-(pyrazol-3-yl)pyridine, towards Brønsted bases is studied, to evaluate peripheral NH deprotonation as a route to a dianionic pincer ligand on a d7 center.
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Affiliation(s)
- Brian J. Cook
- Department of Chemistry
- Indiana University
- Bloomington
- USA
| | - Chun-Hsing Chen
- Department of Chemistry
- Indiana University
- Bloomington
- USA
- Indiana University Molecular Structure Center
| | - Maren Pink
- Department of Chemistry
- Indiana University
- Bloomington
- USA
- Indiana University Molecular Structure Center
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30
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Polezhaev AV, Liss CJ, Telser J, Chen C, Caulton KG. A PNNH Pincer Ligand Allows Access to Monovalent Iron. Chemistry 2017; 24:1330-1341. [DOI: 10.1002/chem.201703795] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Indexed: 12/21/2022]
Affiliation(s)
| | - Cameron J. Liss
- Department of Biological, Chemical, and Physical Sciences Roosevelt University 430 S. Michigan Ave Chicago Illinois 60605 USA
| | - Joshua Telser
- Department of Biological, Chemical, and Physical Sciences Roosevelt University 430 S. Michigan Ave Chicago Illinois 60605 USA
| | - Chun‐Hsing Chen
- Department of Chemistry Indiana University Bloomington 47405 Bloomington IN USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University Bloomington 47405 Bloomington IN USA
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31
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Li J, Banerjee A, Hasse TA, Loloee R, Biros SM, Staples RJ, Chavez FA. Synthesis and reactivity of a 4His enzyme model complex. RSC Adv 2017; 7:50713-50719. [PMID: 29147561 PMCID: PMC5683714 DOI: 10.1039/c7ra09456f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new iron(II) complex has been prepared and characterized. [Fe(TrIm)4(OTf)2] (1, TrIm = 1-Tritylimidazole). The solid state structure of 1 has been determined by X-ray crystallography. Compound 1 crystallizes in triclinic space group P1̄, with a = 13.342(7) Å, b = 13.5131(7) Å and c = 13.7025(7) Å. The iron center resides in distorted octahedral geometry coordinated to four equatorial imidazole groups and two axial triflate oxygens groups. The complex is high spin between 20 K and 300 K as indicated by variable field variable temperature magnetic measurements. A fit of the magnetic data yielded g = 2.24 and D = -0.80 cm-1. A large HOMO-LUMO gap energy (3.89 eV) exists for 1 indicating high stability. Addition of H2O2 or t BuOOH to 1 results in formation of an oxygenated intermediate which upon decomposition results in oxidation of the trityl substituent on the imidazole ligand.
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Affiliation(s)
- Jia Li
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA, , Ph: (248) 370-4092
| | - Atanu Banerjee
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA, , Ph: (248) 370-4092
| | - Timothy A Hasse
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA, , Ph: (248) 370-4092
| | - Reza Loloee
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
| | - Shannon M Biros
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
| | - Richard J Staples
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
| | - Ferman A Chavez
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA, , Ph: (248) 370-4092
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32
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Cook BJ, Polezhaev AV, Chen C, Pink M, Caulton KG. Deprotonation, Chloride Abstraction, and Dehydrohalogenation as Synthetic Routes to Bis‐Pyrazolate Pyridyl Iron(II) Complexes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700558] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Brian J. Cook
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 Bloomington Indiana USA
| | - Alexander V. Polezhaev
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 Bloomington Indiana USA
| | - Chun‐Hsing Chen
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 Bloomington Indiana USA
| | - Maren Pink
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 Bloomington Indiana USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 Bloomington Indiana USA
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33
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Polezhaev AV, Chen CH, Kinne AS, Cabelof AC, Lord RL, Caulton KG. Ligand Design toward Multifunctional Substrate Reductive Transformations. Inorg Chem 2017; 56:9505-9514. [DOI: 10.1021/acs.inorgchem.7b00785] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander V. Polezhaev
- Department of Chemistry, Indiana University—Bloomington, Bloomington, Indiana 47405, United States,
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University—Bloomington, Bloomington, Indiana 47405, United States,
| | - Adam S. Kinne
- Department of Chemistry, Indiana University—Bloomington, Bloomington, Indiana 47405, United States,
| | - Alyssa C. Cabelof
- Department of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Richard L. Lord
- Department of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Kenneth G. Caulton
- Department of Chemistry, Indiana University—Bloomington, Bloomington, Indiana 47405, United States,
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34
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Li J, Molenda MA, Biros SM, Staples RJ, Chavez FA. Assembly of a mononuclear ferrous site using a bulky aldehyde-imidazole ligand. Inorganica Chim Acta 2017; 464:152-156. [PMID: 29238096 PMCID: PMC5724793 DOI: 10.1016/j.ica.2017.05.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A new iron(II) complex has been prepared and characterized. [Fe(TrImA)2(OTf)2] (1, TrImA = 1-Tritylimidazole-4-carboxaldehyde). The solid state structure of 1 has been determined by X-ray crystallography. Compound 1 crystallizes in monoclinic space group P21/c, with a = 10.8323(18) Å, b = 8.1606(13) Å and c = 24.818(4) Å. The iron center is coordinated to two imidazole groups, two pendant aldehyde-derived carbonyl oxygens and two triflate oxygens. The complex is high spin between 300 and 20 K as indicated by variable field variable temperature magnetic measurements. A fit of the magnetic data yielded g = 2.17 and D = 4.05 cm-1. A large HOMO-LUMO gap energy (4.49 eV) exists for 1 indicating high stability.
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Affiliation(s)
- Jia Li
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA
| | - Monika A Molenda
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA
| | - Shannon M Biros
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
| | - Richard J Staples
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
| | - Ferman A Chavez
- Department of Chemistry, Oakland University, Rochester, MI 48309, USA
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35
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Garbe M, Junge K, Beller M. Homogeneous Catalysis by Manganese-Based Pincer Complexes. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700376] [Citation(s) in RCA: 241] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Marcel Garbe
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock; Albert-Einstein-Straße 29a 18055 Rostock Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock; Albert-Einstein-Straße 29a 18055 Rostock Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock; Albert-Einstein-Straße 29a 18055 Rostock Germany
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36
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Papa V, Cabrero-Antonino JR, Alberico E, Spanneberg A, Junge K, Junge H, Beller M. Efficient and selective hydrogenation of amides to alcohols and amines using a well-defined manganese-PNN pincer complex. Chem Sci 2017; 8:3576-3585. [PMID: 30155202 PMCID: PMC6092716 DOI: 10.1039/c7sc00138j] [Citation(s) in RCA: 144] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 02/24/2017] [Indexed: 12/23/2022] Open
Abstract
Novel well-defined NNP and PNP manganese pincer complexes have been synthetized and fully characterized. The catalyst Mn-2 containing an imidazolyaminolphosphino ligand shows high activity and selectivity in the hydrogenation of a wide range of secondary and tertiary amides to the corresponding alcohols and amines, under relatively mild conditions. For the first time, more challenging substrates like primary aromatic amides including an actual herbicide can also be hydrogenated using this earth-abundant metal-based pincer catalyst.
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Affiliation(s)
- Veronica Papa
- Leibniz-Institut für Katalyse , e.V. Albert-Einstein Str. 29a , 18059 Rostock , Germany .
| | | | - Elisabetta Alberico
- Leibniz-Institut für Katalyse , e.V. Albert-Einstein Str. 29a , 18059 Rostock , Germany .
- Instituto di Chimica Biomolecolare , Consiglio Nazionale delle Ricerche , Tr. La Crucca 3 , 07100 Sassari , Italy
| | - Anke Spanneberg
- Leibniz-Institut für Katalyse , e.V. Albert-Einstein Str. 29a , 18059 Rostock , Germany .
| | - Kathrin Junge
- Leibniz-Institut für Katalyse , e.V. Albert-Einstein Str. 29a , 18059 Rostock , Germany .
| | - Henrik Junge
- Leibniz-Institut für Katalyse , e.V. Albert-Einstein Str. 29a , 18059 Rostock , Germany .
| | - Matthias Beller
- Leibniz-Institut für Katalyse , e.V. Albert-Einstein Str. 29a , 18059 Rostock , Germany .
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37
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Toda T, Saitoh K, Yoshinari A, Ikariya T, Kuwata S. Synthesis and Structures of NCN Pincer-Type Ruthenium and Iridium Complexes Bearing Protic Pyrazole Arms. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00065] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatsuro Toda
- School
of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Koki Saitoh
- School
of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Akihiro Yoshinari
- School
of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Takao Ikariya
- School
of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shigeki Kuwata
- School
of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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38
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Yamagishi H, Konuma H, Kuwata S. Stereoselective synthesis of chlorido–phosphine ruthenium complexes bearing a pyrazole-based protic tripodal amine ligand. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.11.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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39
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Adach A. Review: an overview of recent developments in coordination chemistry of polypyrazolylmethylamines. Complexes with N-scorpionate ligands createdin situfrom pyrazole derivatives and zerovalent metals. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1278572] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Anna Adach
- Institute of Chemistry, Jan Kochanowski University of Kielce, Kielce, Poland
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40
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Elangovan S, Neumann J, Sortais JB, Junge K, Darcel C, Beller M. Efficient and selective N-alkylation of amines with alcohols catalysed by manganese pincer complexes. Nat Commun 2016; 7:12641. [PMID: 27708259 PMCID: PMC5059641 DOI: 10.1038/ncomms12641] [Citation(s) in RCA: 433] [Impact Index Per Article: 54.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 07/20/2016] [Indexed: 12/23/2022] Open
Abstract
Borrowing hydrogen (or hydrogen autotransfer) reactions represent straightforward and sustainable C–N bond-forming processes. In general, precious metal-based catalysts are employed for this effective transformation. In recent years, the use of earth abundant and cheap non-noble metal catalysts for this process attracted considerable attention in the scientific community. Here we show that the selective N-alkylation of amines with alcohols can be catalysed by defined PNP manganese pincer complexes. A variety of substituted anilines are monoalkylated with different (hetero)aromatic and aliphatic alcohols even in the presence of other sensitive reducible functional groups. As a special highlight, we report the chemoselective monomethylation of primary amines using methanol under mild conditions. Hydrogen borrowing is an attractive method for C-N bond formation - avoiding multiple alkylation products and reducing waste - but often is carried out with noble metals. Here the authors show that a manganese catalyst allows the selective N-alkylation of amines with alcohols.
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Affiliation(s)
- Saravanakumar Elangovan
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Straße 29a, Rostock 18059, Germany.,UMR 6226 CNRS-Université de Rennes 1 Institut des Sciences Chimiques de Rennes, Team Organometallics: Materials and Catalysis-Centre for Catalysis and Green Chemistry, campus de Beaulieu, 35042 Rennes, France
| | - Jacob Neumann
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Straße 29a, Rostock 18059, Germany
| | - Jean-Baptiste Sortais
- UMR 6226 CNRS-Université de Rennes 1 Institut des Sciences Chimiques de Rennes, Team Organometallics: Materials and Catalysis-Centre for Catalysis and Green Chemistry, campus de Beaulieu, 35042 Rennes, France
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Straße 29a, Rostock 18059, Germany
| | - Christophe Darcel
- UMR 6226 CNRS-Université de Rennes 1 Institut des Sciences Chimiques de Rennes, Team Organometallics: Materials and Catalysis-Centre for Catalysis and Green Chemistry, campus de Beaulieu, 35042 Rennes, France
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Straße 29a, Rostock 18059, Germany
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41
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Elangovan S, Garbe M, Jiao H, Spannenberg A, Junge K, Beller M. Hydrogenation of Esters to Alcohols Catalyzed by Defined Manganese Pincer Complexes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607233] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Saravanakumar Elangovan
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock; Albert-Einstein Strasse 29a Rostock 18059 Germany
| | - Marcel Garbe
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock; Albert-Einstein Strasse 29a Rostock 18059 Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock; Albert-Einstein Strasse 29a Rostock 18059 Germany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock; Albert-Einstein Strasse 29a Rostock 18059 Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock; Albert-Einstein Strasse 29a Rostock 18059 Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock; Albert-Einstein Strasse 29a Rostock 18059 Germany
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42
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Elangovan S, Garbe M, Jiao H, Spannenberg A, Junge K, Beller M. Hydrogenation of Esters to Alcohols Catalyzed by Defined Manganese Pincer Complexes. Angew Chem Int Ed Engl 2016; 55:15364-15368. [PMID: 27690363 DOI: 10.1002/anie.201607233] [Citation(s) in RCA: 219] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Indexed: 12/21/2022]
Abstract
The first manganese-catalyzed hydrogenation of esters to alcohols has been developed. The combination of Mn(CO)5 Br with [HN(CH2 CH2 P(Et)2 )2 ] leads to a mixture of cationic and neutral Mn PNP pincer complexes, which enable the reduction of various ester substrates, including aromatic and aliphatic esters as well as diesters and lactones. Notably, related pincer complexes with isopropyl or cyclohexyl substituents showed very low activity.
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Affiliation(s)
- Saravanakumar Elangovan
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein Strasse 29a, Rostock, 18059, Germany
| | - Marcel Garbe
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein Strasse 29a, Rostock, 18059, Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein Strasse 29a, Rostock, 18059, Germany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein Strasse 29a, Rostock, 18059, Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein Strasse 29a, Rostock, 18059, Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein Strasse 29a, Rostock, 18059, Germany
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43
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Toda T, Yoshinari A, Ikariya T, Kuwata S. Protic N-Heterocyclic Carbene Versus Pyrazole: Rigorous Comparison of Proton- and Electron-Donating Abilities in a Pincer-Type Framework. Chemistry 2016; 22:16675-16683. [DOI: 10.1002/chem.201602552] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Tatsuro Toda
- Department of Chemical Science and Engineering; School of Materials and Chemical Technology; Tokyo Institute of Technology; 2 12-1 E4-1 O-okayama, Meguro-ku Tokyo 152-8552 Japan
| | - Akihiro Yoshinari
- Department of Chemical Science and Engineering; School of Materials and Chemical Technology; Tokyo Institute of Technology; 2 12-1 E4-1 O-okayama, Meguro-ku Tokyo 152-8552 Japan
| | - Takao Ikariya
- Department of Chemical Science and Engineering; School of Materials and Chemical Technology; Tokyo Institute of Technology; 2 12-1 E4-1 O-okayama, Meguro-ku Tokyo 152-8552 Japan
| | - Shigeki Kuwata
- Department of Chemical Science and Engineering; School of Materials and Chemical Technology; Tokyo Institute of Technology; 2 12-1 E4-1 O-okayama, Meguro-ku Tokyo 152-8552 Japan
- PRESTO; Japan Science and Technology Agency (JST); 4-1-8 Honcho, Kawaguchi Saitama 332-0012 Japan
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44
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Coordination and electronic characteristics of a nitrogen heterocycle pincer ligand. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.07.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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45
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Elangovan S, Topf C, Fischer S, Jiao H, Spannenberg A, Baumann W, Ludwig R, Junge K, Beller M. Selective Catalytic Hydrogenations of Nitriles, Ketones, and Aldehydes by Well-Defined Manganese Pincer Complexes. J Am Chem Soc 2016; 138:8809-14. [PMID: 27219853 DOI: 10.1021/jacs.6b03709] [Citation(s) in RCA: 394] [Impact Index Per Article: 49.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hydrogenations constitute fundamental processes in organic chemistry and allow for atom-efficient and clean functional group transformations. In fact, the selective reduction of nitriles, ketones, and aldehydes with molecular hydrogen permits access to a green synthesis of valuable amines and alcohols. Despite more than a century of developments in homogeneous and heterogeneous catalysis, efforts toward the creation of new useful and broadly applicable catalyst systems are ongoing. Recently, Earth-abundant metals have attracted significant interest in this area. In the present study, we describe for the first time specific molecular-defined manganese complexes that allow for the hydrogenation of various polar functional groups. Under optimal conditions, we achieve good functional group tolerance, and industrially important substrates, e.g., for the flavor and fragrance industry, are selectively reduced.
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Affiliation(s)
| | - Christoph Topf
- Leibniz-Institut für Katalyse e.V. , Albert Einstein Straße 29a, 18059 Rostock, Germany
| | - Steffen Fischer
- Institut für Chemie, Universität Rostock , Dr.-Lorenz-Weg 1, 18059 Rostock, Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e.V. , Albert Einstein Straße 29a, 18059 Rostock, Germany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e.V. , Albert Einstein Straße 29a, 18059 Rostock, Germany
| | - Wolfgang Baumann
- Leibniz-Institut für Katalyse e.V. , Albert Einstein Straße 29a, 18059 Rostock, Germany
| | - Ralf Ludwig
- Institut für Chemie, Universität Rostock , Dr.-Lorenz-Weg 1, 18059 Rostock, Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. , Albert Einstein Straße 29a, 18059 Rostock, Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. , Albert Einstein Straße 29a, 18059 Rostock, Germany
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46
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Nerush A, Vogt M, Gellrich U, Leitus G, Ben-David Y, Milstein D. Template Catalysis by Metal–Ligand Cooperation. C–C Bond Formation via Conjugate Addition of Non-activated Nitriles under Mild, Base-free Conditions Catalyzed by a Manganese Pincer Complex. J Am Chem Soc 2016; 138:6985-97. [DOI: 10.1021/jacs.5b13208] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Matthias Vogt
- Institut
für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
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47
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Toda T, Kuwata S, Ikariya T. Synthesis and Structures of Ruthenium and Iron Complexes Bearing an Unsymmetrical Pincer-type Ligand with Protic Pyrazole and Tertiary Aminoalkyl Arms. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500558] [Citation(s) in RCA: 12] [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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48
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Synthesis, crystal structure and reactivity studies of iron complexes with pybox ligands. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.08.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Toda T, Kuwata S, Ikariya T. Unsymmetrical pincer-type ruthenium complex containing β-protic pyrazole and N-heterocyclic carbene arms: comparison of Brønsted acidity of NH groups in second coordination sphere. Chemistry 2014; 20:9539-42. [PMID: 24965086 DOI: 10.1002/chem.201403179] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Indexed: 12/30/2022]
Abstract
A reaction of a 2-(imidazol-1-yl)methyl-6-(pyrazol-3-yl)pyridine with [RuCl2 (PPh3 )3 ] resulted in tautomerization of the imidazole unit to afford the unsymmetrical pincer-type ruthenium complex 2 containing a protic pyrazole and N-heterocyclic carbene (NHC) arms. Deprotonation of 2 with one equivalent of a base led to the formation of the NHC-pyrazolato complex 3, indicating that the protic NHC arm is less acidic. When 2 was treated with two equivalents of a base under H2 or in 2-propanol, the hydrido complex 4 containing protic NHC and pyrazolato groups was obtained through metal-ligand cooperation.
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Affiliation(s)
- Tatsuro Toda
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552 (Japan), Fax: (+81) 3-5734-2637
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Kuwata S, Ikariya T. Metal–ligand bifunctional reactivity and catalysis of protic N-heterocyclic carbene and pyrazole complexes featuring β-NH units. Chem Commun (Camb) 2014; 50:14290-300. [DOI: 10.1039/c4cc04457f] [Citation(s) in RCA: 132] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The metal–ligand bifunctional cooperation of protic N-heterocyclic carbene and pyrazole complexes bearing an NH unit at the position β to the metal is surveyed.
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Affiliation(s)
- Shigeki Kuwata
- Department of Applied Chemistry
- Graduate School of Science and Engineering
- Tokyo Institute of Technology
- Tokyo, Japan
| | - Takao Ikariya
- Department of Applied Chemistry
- Graduate School of Science and Engineering
- Tokyo Institute of Technology
- Tokyo, Japan
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