1
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Subaramanian M, Sivakumar G, Babu JK, Balaraman E. Selective hydrogenation of primary amides and cyclic di-peptides under Ru-catalysis. Chem Commun (Camb) 2020; 56:12411-12414. [PMID: 32936149 DOI: 10.1039/d0cc04550k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A ruthenium(ii)-catalyzed selective hydrogenation of challenging primary amides and cyclic di-peptides to their corresponding primary alcohols and amino alcohols, respectively, is reported. The hydrogenation reaction operates under mild and eco-benign conditions and can be scaled-up.
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Affiliation(s)
- Murugan Subaramanian
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati - 517507, India.
| | - Ganesan Sivakumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati - 517507, India.
| | - Jessin K Babu
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati - 517507, India.
| | - Ekambaram Balaraman
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati - 517507, India.
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2
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Omolo KO, Bacsa J, Sadighi JP. Acridine Variations for Coordination Chemistry. Isr J Chem 2020. [DOI: 10.1002/ijch.202000006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kevin O. Omolo
- School of Chemistry & BiochemistryGeorgia Institute of Technology Atlanta, Georgia U.S.A
- present address: Intel Corporation, Chandler, AZ U.S.A
| | - John Bacsa
- X-Ray Crystallography CenterDepartment of Chemistry, Emory University Atlanta, Georgia U.S.A
- School of Chemistry & BiochemistryGeorgia Institute of Technology Atlanta, Georgia U.S.A
| | - Joseph P. Sadighi
- School of Chemistry & BiochemistryGeorgia Institute of Technology Atlanta, Georgia, U.S.A
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3
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Schnieders D, Tsui BTH, Sung MMH, Bortolus MR, Schrobilgen GJ, Neugebauer J, Morris RH. Metal Hydride Vibrations: The Trans Effect of the Hydride. Inorg Chem 2019; 58:12467-12479. [DOI: 10.1021/acs.inorgchem.9b02302] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- David Schnieders
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
- Center for Multiscale Theory and Computation, Corrensstraße 40, 48149 Münster, Germany
| | - Brian T. H. Tsui
- Department of Chemistry, University of Toronto, 80 St. George Street Toronto, Ontario M5S 3H6, Canada
| | - Molly M. H. Sung
- Department of Chemistry, University of Toronto, 80 St. George Street Toronto, Ontario M5S 3H6, Canada
| | - Mark R. Bortolus
- Department of Chemistry, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Gary J. Schrobilgen
- Department of Chemistry, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Johannes Neugebauer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
- Center for Multiscale Theory and Computation, Corrensstraße 40, 48149 Münster, Germany
| | - Robert H. Morris
- Department of Chemistry, University of Toronto, 80 St. George Street Toronto, Ontario M5S 3H6, Canada
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4
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Jackson BJ, Najera DC, Matson EM, Woods TJ, Bertke JA, Fout AR. Synthesis and Characterization of (DIPPCCC)Fe Complexes: A Zwitterionic Metalation Method and CO2 Reactivity. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00271] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Bailey J. Jackson
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Daniel C. Najera
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Ellen M. Matson
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Toby J. Woods
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Jeffery A. Bertke
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Alison R. Fout
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
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5
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Zhong R, Wei Z, Zhang W, Liu S, Liu Q. A Practical and Stereoselective In Situ NHC-Cobalt Catalytic System for Hydrogenation of Ketones and Aldehydes. Chem 2019. [DOI: 10.1016/j.chempr.2019.03.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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6
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Guzmán J, Bernal AM, García-Orduña P, Lahoz FJ, Oro LA, Fernández-Alvarez FJ. Selective reduction of formamides to O-silylated hemiaminals or methylamines with HSiMe 2Ph catalyzed by iridium complexes. Dalton Trans 2019; 48:4255-4262. [PMID: 30847452 DOI: 10.1039/c8dt05070h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of (4-methyl-pyridin-2-iloxy)ditertbutylsilane (NSitBu-H, 1) with [IrCl(coe)2]2 affords the iridium(iii) complex [Ir(H)(Cl)(κ2-NSitBu)(coe)] (2), which has been fully characterized including X-ray diffraction studies. The reaction of 2 with AgCF3SO3 leads to the formation of species [Ir(H)(CF3SO3)(κ2-NSitBu)(coe)] (3). The iridium complexes 2 and 3 are effective catalysts for the reduction of formamides with HSiMe2Ph. The selectivity of the reduction process depends on the catalyst. Thus, by using complex 2, with a chloride ancillary ligand, it has been possible to selectively obtain the corresponding O-silylated hemiaminal by reaction of formamides with one equivalent of HSiMe2Ph, while complex 3, with a triflate ligand instead of chloride, catalyzed the selective reduction of formamides to the corresponding methylamine.
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Affiliation(s)
- Jefferson Guzmán
- Departamento de Química Inorgánica - Instituto de Síntesis Química y Catálisis Homogénea (ISQCH). Universidad de Zaragoza - CSIC, Facultad de Ciencias 50009, Zaragoza, Spain.
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7
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Zhou X, Malakar S, Zhou T, Murugesan S, Huang C, Emge TJ, Krogh-Jespersen K, Goldman AS. Catalytic Alkane Transfer Dehydrogenation by PSP-Pincer-Ligated Ruthenium. Deactivation of an Extremely Reactive Fragment by Formation of Allyl Hydride Complexes. ACS Catal 2019. [DOI: 10.1021/acscatal.8b05172] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Xiaoguang Zhou
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Santanu Malakar
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Tian Zhou
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Sathiyamoorthy Murugesan
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Carlos Huang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Thomas J. Emge
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Karsten Krogh-Jespersen
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Alan S. Goldman
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
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8
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Wang J, Wu K, Qi X. Theoretical study of the ligand effect on NHC–cobalt-catalyzed hydrogenation of ketones. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01239g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Theoretical study of ketone hydrogenation revealed that the catalyst regeneration step is more sensitive to the ligand effect.
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Affiliation(s)
- Juan Wang
- Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Kangbing Wu
- Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Xiaotian Qi
- Department of Chemistry
- University of Pittsburgh
- Pittsburgh
- USA
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9
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Tran BL, Fulton JL, Linehan JC, Lercher JA, Bullock RM. Rh(CAAC)-Catalyzed Arene Hydrogenation: Evidence for Nanocatalysis and Sterically Controlled Site-Selective Hydrogenation. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02589] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ba L. Tran
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - John L. Fulton
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - John C. Linehan
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Johannes A. Lercher
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - R. Morris Bullock
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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10
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Nakahara Y, Toda T, Matsunami A, Kayaki Y, Kuwata S. Protic NNN and NCN Pincer‐Type Ruthenium Complexes Featuring (Trifluoromethyl)pyrazole Arms: Synthesis and Application to Catalytic Hydrogen Evolution from Formic Acid. Chem Asian J 2017; 13:73-80. [DOI: 10.1002/asia.201701474] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 11/15/2017] [Indexed: 01/22/2023]
Affiliation(s)
- Yoshiko Nakahara
- 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
| | - 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
| | - Asuka Matsunami
- 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
- Present address: Department of Chemistry and Biological Science, College of Science and Engineering Aoyama Gakuin University 5-10-1 Fuchinobe, Chuo-ku Sagamihara 252-5258 Japan
| | - Yoshihito Kayaki
- 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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11
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Corre Y, Trivelli X, Capet F, Djukic JP, Agbossou-Niedercorn F, Michon C. Efficient and Selective Hydrosilylation of Secondary and Tertiary Amides Catalyzed by an Iridium(III) Metallacycle: Development and Mechanistic Investigation. ChemCatChem 2017. [DOI: 10.1002/cctc.201700400] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yann Corre
- Univ. Lille; CNRS, Centrale Lille; ENSCL; Univ. Artois; UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-; 59000 Lille France
- ENSCL; UCCS-CCM-MOCAH (Chimie-C7) CS 90108; 59652 Villeneuve d'Ascq Cedex France
| | - Xavier Trivelli
- UGSF CNRS, UMR 8576; Université Lille Nord de France; 59655 Villeneuve d'Ascq Cedex France
| | - Frédéric Capet
- Univ. Lille; CNRS, Centrale Lille; ENSCL; Univ. Artois; UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-; 59000 Lille France
| | - Jean-Pierre Djukic
- Institut de Chimie de Strasbourg; UMR 7177; Université de Strasbourg; 4 rue Blaise Pascal, F- 67000 Strasbourg France
| | - Francine Agbossou-Niedercorn
- Univ. Lille; CNRS, Centrale Lille; ENSCL; Univ. Artois; UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-; 59000 Lille France
- ENSCL; UCCS-CCM-MOCAH (Chimie-C7) CS 90108; 59652 Villeneuve d'Ascq Cedex France
| | - Christophe Michon
- Univ. Lille; CNRS, Centrale Lille; ENSCL; Univ. Artois; UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-; 59000 Lille France
- ENSCL; UCCS-CCM-MOCAH (Chimie-C7) CS 90108; 59652 Villeneuve d'Ascq Cedex France
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12
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Luo Q, Dai Z, Cong H, Li R, Peng T, Zhang J. Oxidant-free synthesis of benzimidazoles from alcohols and aromatic diamines catalysed by new Ru(ii)-PNS(O) pincer complexes. Dalton Trans 2017; 46:15012-15022. [DOI: 10.1039/c7dt02584j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A greener method for synthesizing 2-substituted benzimidazole through the acceptorless dehydrogenative condensation of alcohols and ortho-arylenediamine is developed.
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Affiliation(s)
- Qi Luo
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Zengjin Dai
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Hengjiang Cong
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Renjie Li
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Tianyou Peng
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Jing Zhang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
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13
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Hasanayn F, Al-Assi LM, Moussawi RN, Omar BS. Mechanism of Alcohol–Water Dehydrogenative Coupling into Carboxylic Acid Using Milstein’s Catalyst: A Detailed Investigation of the Outer-Sphere PES in the Reaction of Aldehydes with an Octahedral Ruthenium Hydroxide. Inorg Chem 2016; 55:7886-902. [DOI: 10.1021/acs.inorgchem.6b00766] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Faraj Hasanayn
- Department of Chemistry, The American University of Beirut, Beirut, Lebanon
| | - Lara M. Al-Assi
- Department of Chemistry, The American University of Beirut, Beirut, Lebanon
| | - Rasha N. Moussawi
- Department of Chemistry, The American University of Beirut, Beirut, Lebanon
| | - Boushra Srour Omar
- Department of Chemistry, The American University of Beirut, Beirut, Lebanon
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14
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Affiliation(s)
- Cristian Vicent
- Serveis
Centrals d’Instrumentació Cientı́fica, Universitat Jaume I, 12071 Castellón, Spain
| | - Dmitry G. Gusev
- Department
of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
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15
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Zell T, Milstein D. Hydrogenation and dehydrogenation iron pincer catalysts capable of metal-ligand cooperation by aromatization/dearomatization. Acc Chem Res 2015; 48:1979-94. [PMID: 26079678 DOI: 10.1021/acs.accounts.5b00027] [Citation(s) in RCA: 459] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The substitution of expensive and potentially toxic noble-metal catalysts by cheap, abundant, environmentally benign, and less toxic metals is highly desirable and in line with green chemistry guidelines. We have recently discovered a new type of metal-ligand cooperation, which is based on the reversible dearomatization/aromatization of different heteroaromatic ligand cores caused by deprotonation/protonation of the ligand. More specifically, we have studied complexes of various transition metals (Ru, Fe, Co, Rh, Ir, Ni, Pd, Pt, and Re) bearing pyridine- and bipyridine-based PNP and PNN pincer ligands, which have slightly acidic methylene protons. In addition, we have discovered long-range metal-ligand cooperation in acridine-based pincer ligands, where the cooperation takes place at the electrophilic C-9 position of the acridine moiety leading to dearomatization of its middle ring. This type of metal-ligand cooperation was used for the activation of chemical bonds, including H-H, C-H (sp(2) and sp(3)), O-H, N-H, and B-H bonds. This unusual reactivity likely takes place in various catalytic hydrogenation, dehydrogenation, and related reactions. In this Account, we summarize our studies on novel bifunctional iron PNP and PNN pincer complexes, which were designed on the basis of their ruthenium congeners. Iron PNP pincer complexes serve as efficient (pre)catalysts for hydrogenation and dehydrogenation reactions under remarkably mild conditions. Their catalytic applications include atom-efficient and industrially important hydrogenation reactions of ketones, aldehydes, and esters to the corresponding alcohols. Moreover, they catalyze the hydrogenation of carbon dioxide to sodium formate in the presence of sodium hydroxide, the selective decomposition of formic acid to carbon dioxide and hydrogen, and the E-selective semihydrogenation of alkynes to give E-alkenes. These catalysts feature, compared to other iron-based catalysts, very high catalytic activities which in some cases can even exceed those of state-of-the-art noble-metal catalysts. For the iron PNP systems, we describe the synthesis of the pyridine- and acridine-based PNP iron complexes and their performances and limitations in catalytic reactions, and we present studies on their reactivity with relevance to their catalytic mechanisms. In the case of the bipyridine-based PNN system, we summarize the synthesis of new complexes and describe studies on the noninnocence of the methylene position, which can be reversibly deprotonated, as well as on the noninnocence of the bipyridine unit. Overall, this Account underlines that the combination of cheap and abundant iron with ligands that are capable of metal-ligand cooperation can result in the development of novel, versatile, and efficient catalysts for atom-efficient catalytic reactions.
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Affiliation(s)
- Thomas Zell
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - David Milstein
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
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16
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Rivada-Wheelaghan O, Dauth A, Leitus G, Diskin-Posner Y, Milstein D. Synthesis and Reactivity of Iron Complexes with a New Pyrazine-Based Pincer Ligand, and Application in Catalytic Low-Pressure Hydrogenation of Carbon Dioxide. Inorg Chem 2015; 54:4526-38. [DOI: 10.1021/acs.inorgchem.5b00366] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Orestes Rivada-Wheelaghan
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Alexander Dauth
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Gregory Leitus
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yael Diskin-Posner
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - David Milstein
- Department of Organic
Chemistry and ‡Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
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17
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Milstein D. Metal-ligand cooperation by aromatization-dearomatization as a tool in single bond activation. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2014.0189. [PMID: 25666071 DOI: 10.1098/rsta.2014.0189] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Metal-ligand cooperation (MLC) plays an important role in bond activation processes, enabling many chemical and biological catalytic reactions. A recent new mode of activation of chemical bonds involves ligand aromatization-dearomatization processes in pyridine-based pincer complexes in which chemical bonds are broken reversibly across the metal centre and the pincer-ligand arm, leading to new bond-making and -breaking processes, and new catalysis. In this short review, such processes are briefly exemplified in the activation of C-H, H-H, O-H, N-H and B-H bonds, and mechanistic insight is provided. This new bond activation mode has led to the development of various catalytic reactions, mainly based on alcohols and amines, and to a stepwise approach to thermal H2 and light-induced O2 liberation from water.
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Affiliation(s)
- David Milstein
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
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