51
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Elangovan S, Wendt B, Topf C, Bachmann S, Scalone M, Spannenberg A, Jiao H, Baumann W, Junge K, Beller M. Improved Second Generation Iron Pincer Complexes for Effective Ester Hydrogenation. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500930] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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52
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Bauer G, Hu X. Recent developments of iron pincer complexes for catalytic applications. Inorg Chem Front 2016. [DOI: 10.1039/c5qi00262a] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron pincer complexes exhibit excellent activity in homogeneous catalysis.
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Affiliation(s)
- Gerald Bauer
- Laboratory of Inorganic Synthesis and Catalysis
- Institute of Chemical Sciences and Engineering
- École Polytechnique Fédérale de Lausanne (EPFL)
- 1015 Lausanne
- Switzerland
| | - Xile Hu
- Laboratory of Inorganic Synthesis and Catalysis
- Institute of Chemical Sciences and Engineering
- École Polytechnique Fédérale de Lausanne (EPFL)
- 1015 Lausanne
- Switzerland
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53
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Dub PA, Scott BL, Gordon JC. First-row transition metal complexes of ENENES ligands: the ability of the thioether donor to impact the coordination chemistry. Dalton Trans 2016; 45:1560-71. [DOI: 10.1039/c5dt03855c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The reactions of two variants of ENENES ligands, E(CH2)2NH(CH)2SR, where E = 4-morpholinyl, R = Ph (a), Bn (b) with MCl2 (M = Mn, Fe, Co, Ni and Cu) in coordinating solvents (MeCN, EtOH) affords isolable complexes, whose magnetic susceptibility measurements suggest paramagnetism and a high-spin formulation.
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Affiliation(s)
- Pavel A. Dub
- Chemistry Division
- Los Alamos National Laboratory
- Los Alamos
- USA
| | - Brian L. Scott
- Materials and Physics Applications Division
- Los Alamos National Laboratory
- Los Alamos
- USA
| | - John C. Gordon
- Chemistry Division
- Los Alamos National Laboratory
- Los Alamos
- USA
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54
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Sawatlon B, Surawatanawong P. Mechanisms for dehydrogenation and hydrogenation of N-heterocycles using PNP-pincer-supported iron catalysts: a density functional study. Dalton Trans 2016; 45:14965-78. [DOI: 10.1039/c6dt02431a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The bifunctionality of Fe-PNP plays a role in stabilizing the ion-pair complex in the dehydrogenation via a hydrogen bonding and a C–H agostic interaction.
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Affiliation(s)
- Boodsarin Sawatlon
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
- Thailand
| | - Panida Surawatanawong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
- Thailand
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55
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Lange S, Elangovan S, Cordes C, Spannenberg A, Jiao H, Junge H, Bachmann S, Scalone M, Topf C, Junge K, Beller M. Selective catalytic hydrogenation of nitriles to primary amines using iron pincer complexes. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00834h] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The selective catalytic hydrogenation of nitriles to primary amines with the well-defined Fe(PNPCy) pincer complex 2 is reported.
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Affiliation(s)
- S. Lange
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - S. Elangovan
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - C. Cordes
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - A. Spannenberg
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - H. Jiao
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - H. Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - S. Bachmann
- F. Hoffmann-La Roche AG
- Process Research & Development
- CoE Catalysis
- 4070 Basel
- Switzerland
| | - M. Scalone
- F. Hoffmann-La Roche AG
- Process Research & Development
- CoE Catalysis
- 4070 Basel
- Switzerland
| | - C. Topf
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - K. Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - M. Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
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56
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Glüer A, Förster M, Celinski VR, Schmedt auf der Günne J, Holthausen MC, Schneider S. Highly Active Iron Catalyst for Ammonia Borane Dehydrocoupling at Room Temperature. ACS Catal 2015. [DOI: 10.1021/acscatal.5b02406] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arne Glüer
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Moritz Förster
- Insitut
für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Vinicius R. Celinski
- Inorganic
Materials Chemistry, University of Siegen, Adolf-Reichwein-Straße 2, D-57068 Siegen, Germany
| | | | - Max C. Holthausen
- Insitut
für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Sven Schneider
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
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57
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Xu Y, Rettenmeier CA, Plundrich GT, Wadepohl H, Enders M, Gade LH. Borane-Bridged Ruthenium Complex Bearing a PNP Ligand: Synthesis and Structural Characterization. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00699] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yijing Xu
- Anorganisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Christoph A. Rettenmeier
- Anorganisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Gudrun T. Plundrich
- Anorganisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Markus Enders
- Anorganisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Lutz H. Gade
- Anorganisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
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58
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Hickey AK, Chen CH, Pink M, Smith JM. Low-Valent Iron Carbonyl Complexes with a Tripodal Carbene Ligand. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00646] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anne K. Hickey
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Maren Pink
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Jeremy M. Smith
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
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59
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Zhao H, Li X, Zhang S, Sun H. Synthesis and Characterization of Iron, Cobalt, and Nickel [PNP] Pincer Amido Complexes by N-H Activation. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500568] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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60
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61
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Chakraborty S, Bhattacharya P, Dai H, Guan H. Nickel and iron pincer complexes as catalysts for the reduction of carbonyl compounds. Acc Chem Res 2015; 48:1995-2003. [PMID: 26098431 DOI: 10.1021/acs.accounts.5b00055] [Citation(s) in RCA: 300] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The reductions of aldehydes, ketones, and esters to alcohols are important processes for the synthesis of chemicals that are vital to our daily life, and the reduction of CO2 to methanol is expected to provide key technology for carbon management and energy storage in our future. Catalysts that affect the reduction of carbonyl compounds often contain ruthenium, osmium, or other precious metals. The high and fluctuating price, and the limited availability of these metals, calls for efforts to develop catalysts based on more abundant and less expensive first-row transition metals, such as nickel and iron. The challenge, however, is to identify ligand systems that can increase the thermal stability of the catalysts, enhance their reactivity, and bypass the one-electron pathways that are commonly observed for first-row transition metal complexes. Although many other strategies exist, this Account describes how we have utilized pincer ligands along with other ancillary ligands to accomplish these goals. The bis(phosphinite)-based pincer ligands (also known as POCOP-pincer ligands) create well-defined nickel hydride complexes as efficient catalysts for the hydrosilylation of aldehydes and ketones and the hydroboration of CO2 to methanol derivatives. The hydride ligands in these complexes are substantially nucleophilic, largely due to the enhancement by the strongly trans-influencing aryl groups. Under the same principle, the pincer-ligated nickel cyanomethyl complexes exhibit remarkably high activity (turnover numbers up to 82,000) for catalytically activating acetonitrile and the addition of H-CH2CN across the C═O bonds of aldehydes without requiring a base additive. Cyclometalation of bis(phosphinite)-based pincer ligands with low-valent iron species "Fe(PR3)4" results in diamagnetic Fe(II) hydride complexes, which are active catalysts for the hydrosilylation of aldehydes and ketones. Mechanistic investigation suggests that the hydride ligand is not delivered to the carbonyl substrates but is important to facilitate ligand dissociation prior to substrate activation. In the presence of CO, the amine-bis(phosphine)-based pincer ligands are also able to stabilize low-spin Fe(II) species. Iron dihydride complexes supported by these ligands are bifunctional as both the FeH and NH moieties participate in the reduction of C═O bonds. These iron pincer complexes are among the first iron-based catalysts for the hydrogenation of esters, including fatty acid methyl esters, which find broad applications in industry. Our studies demonstrate that pincer ligands are promising candidates for promoting the first-row transition metal-catalyzed reduction of carbonyl compounds with high efficiency. Further efforts in this research area are likely to lead to more efficient and practical catalysts.
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Affiliation(s)
- Sumit Chakraborty
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Papri Bhattacharya
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Huiguang Dai
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Hairong Guan
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
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62
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Zhang Y, MacIntosh AD, Wong JL, Bielinski EA, Williard PG, Mercado BQ, Hazari N, Bernskoetter WH. Iron catalyzed CO 2 hydrogenation to formate enhanced by Lewis acid co-catalysts. Chem Sci 2015; 6:4291-4299. [PMID: 29218198 PMCID: PMC5707511 DOI: 10.1039/c5sc01467k] [Citation(s) in RCA: 234] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 05/15/2015] [Indexed: 12/24/2022] Open
Abstract
A family of iron(ii) carbonyl hydride complexes supported by either a bifunctional PNP ligand containing a secondary amine, or a PNP ligand with a tertiary amine that prevents metal-ligand cooperativity, were found to promote the catalytic hydrogenation of CO2 to formate in the presence of Brønsted base. In both cases a remarkable enhancement in catalytic activity was observed upon the addition of Lewis acid (LA) co-catalysts. For the secondary amine supported system, turnover numbers of approximately 9000 for formate production were achieved, while for catalysts supported by the tertiary amine ligand, nearly 60 000 turnovers were observed; the highest activity reported for an earth abundant catalyst to date. The LA co-catalysts raise the turnover number by more than an order of magnitude in each case. In the secondary amine system, mechanistic investigations implicated the LA in disrupting an intramolecular hydrogen bond between the PNP ligand N-H moiety and the carbonyl oxygen of a formate ligand in the catalytic resting state. This destabilization of the iron-bound formate accelerates product extrusion, the rate-limiting step in catalysis. In systems supported by ligands with the tertiary amine, it was demonstrated that the LA enhancement originates from cation assisted substitution of formate for dihydrogen during the slow step in catalysis.
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Affiliation(s)
- Yuanyuan Zhang
- The Department of Chemistry , Brown University , Providence , RI 02912 , USA .
| | - Alex D MacIntosh
- The Department of Chemistry , Brown University , Providence , RI 02912 , USA .
| | - Janice L Wong
- The Department of Chemistry , Yale University , New Haven , CT 06520 , USA .
| | | | - Paul G Williard
- The Department of Chemistry , Brown University , Providence , RI 02912 , USA .
| | - Brandon Q Mercado
- The Department of Chemistry , Yale University , New Haven , CT 06520 , USA .
| | - Nilay Hazari
- The Department of Chemistry , Yale University , New Haven , CT 06520 , USA .
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63
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Dub PA, Scott BL, Gordon JC. Air-Stable NNS (ENENES) Ligands and Their Well-Defined Ruthenium and Iridium Complexes for Molecular Catalysis. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00432] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Pavel A. Dub
- Chemistry Division, and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Brian L. Scott
- Chemistry Division, and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - John C. Gordon
- Chemistry Division, and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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64
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Alberico E, Nielsen M. Towards a methanol economy based on homogeneous catalysis: methanol to H2 and CO2 to methanol. Chem Commun (Camb) 2015; 51:6714-25. [PMID: 25707880 DOI: 10.1039/c4cc09471a] [Citation(s) in RCA: 148] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The possibility to implement both the exhaustive dehydrogenation of aqueous methanol to hydrogen and CO2 and the reverse reaction, the hydrogenation of CO2 to methanol and water, may pave the way to a methanol based economy as part of a promising renewable energy system. Recently, homogeneous catalytic systems have been reported which are able to promote either one or the other of the two reactions under mild conditions. Here, we review and discuss these developments.
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Affiliation(s)
- E Alberico
- Istituto di Chimica Biomolecolare, CNR, tr. La Crucca 3, 07100 Sassari, Italy.
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65
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Jiao H, Junge K, Alberico E, Beller M. A comparative computationally study about the defined M(II) pincer hydrogenation catalysts (M = Fe, Ru, Os). J Comput Chem 2015; 37:168-76. [PMID: 25982241 DOI: 10.1002/jcc.23944] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 04/28/2015] [Accepted: 04/28/2015] [Indexed: 01/18/2023]
Abstract
The mechanism of acetonitrile and methyl benzoate catalytic hydrogenation using pincer catalysts M(H)2 (CO)[NH(C2 H4 PiPr2 )2 ] (1M) and M(H)(CO)[N(C2 H4 PiPr2 )2 ] (2M) (M = Fe, Ru, Os) has been computed at various levels of density functional theory. The computed equilibrium between 1Fe and 2Fe agrees perfectly with the experimental observations. On the basis of the activation barriers and reaction energies, the best catalysts for acetonitrile hydrogenation are 1Fe/2Fe and 1Ru/2Ru, and the best catalysts for methyl benzoate hydrogenation are 1Ru/2Ru. The best catalysts for the dehydrogenation of benzyl alcohol are 1Ru/2Ru. It is to note that the current polarizable continuum model is not sufficient in modeling the solvation effect in the energetic properties of these catalysts as well as their catalytic properties in hydrogenation reaction, as no equilibrium could be established between 1Fe and 2Fe. Comparison with other methods and procedures has been made. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Haijun Jiao
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock Albert-Einstein-Straße 29a, 18059, Rostock, Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock Albert-Einstein-Straße 29a, 18059, Rostock, Germany
| | - Elisabetta Alberico
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock Albert-Einstein-Straße 29a, 18059, Rostock, Germany.,Istituto di Chimica Biomolecolare, CNR, tr. La Crucca 3, 07100, Sassari, Italy
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock Albert-Einstein-Straße 29a, 18059, Rostock, Germany
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66
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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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67
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68
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Schaefer BA, Margulieux GW, Small BL, Chirik PJ. Evaluation of Cobalt Complexes Bearing Tridentate Pincer Ligands for Catalytic C–H Borylation. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00044] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian A. Schaefer
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Grant W. Margulieux
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Brooke L. Small
- Chevron Phillips Chemical Company, 1862 Kingwood Drive, Kingwood, Texas 77339, United States
| | - Paul J. Chirik
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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69
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Bielinski EA, Förster M, Zhang Y, Bernskoetter WH, Hazari N, Holthausen MC. Base-Free Methanol Dehydrogenation Using a Pincer-Supported Iron Compound and Lewis Acid Co-catalyst. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00137] [Citation(s) in RCA: 161] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elizabeth A. Bielinski
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Moritz Förster
- Institut
für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Yuanyuan Zhang
- Department
of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Wesley H. Bernskoetter
- Department
of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Nilay Hazari
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Max C. Holthausen
- Institut
für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
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70
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Affiliation(s)
- Ingmar Bauer
- Department Chemie, Technische Universität Dresden, Bergstraße 66, 01069 Dresden, Germany
| | - Hans-Joachim Knölker
- Department Chemie, Technische Universität Dresden, Bergstraße 66, 01069 Dresden, Germany
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71
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Peña-López M, Neumann H, Beller M. Iron(II) Pincer-Catalyzed Synthesis of Lactones and Lactams through a Versatile Dehydrogenative Domino Sequence. ChemCatChem 2015. [DOI: 10.1002/cctc.201402967] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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72
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Samanta S, Demesko S, Dechert S, Meyer F. A two-in-one pincer ligand and its diiron(II) complex showing spin state switching in solution through reversible ligand exchange. Angew Chem Int Ed Engl 2015; 54:583-7. [PMID: 25412962 DOI: 10.1002/anie.201408966] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Indexed: 11/09/2022]
Abstract
A novel pyrazolate-bridged ligand providing two {PNN} pincer-type compartments has been synthesized. Its diiron(II) complex LFe2(OTf)3(CH3CN) (1; Tf = triflate) features, in solid state, two bridging triflate ligands, with a terminal triflate and a MeCN ligand completing the octahedral coordination spheres of the two high-spin metal ions. In MeCN solution, 1 is shown to undergo a sequential, reversible, and complete spin transition to the low-spin state upon cooling. Detailed UV/Vis and (19)F NMR spectroscopic studies as well as magnetic measurements have unraveled that spin state switching correlates with a rapid multistep triflate/MeCN ligand exchange equilibrium. The spin transition temperature can be continuously tuned by varying the triflate concentration in solution.
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Affiliation(s)
- Subhas Samanta
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen (Germany) http://www.meyer.chemie.uni-goettingen.de
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73
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Sharninghausen LS, Mercado BQ, Crabtree RH, Hazari N. Selective conversion of glycerol to lactic acid with iron pincer precatalysts. Chem Commun (Camb) 2015; 51:16201-4. [DOI: 10.1039/c5cc06857f] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A family of iron complexes of PNP pincer ligands are active catalysts for the conversion of glycerol to lactic acid with high activity and selectivity.
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Affiliation(s)
| | | | | | - Nilay Hazari
- Department of Chemistry
- Yale University
- New Haven
- USA
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74
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Yang X. Bio-inspired computational design of iron catalysts for the hydrogenation of carbon dioxide. Chem Commun (Camb) 2015; 51:13098-101. [DOI: 10.1039/c5cc03372a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A computationally designed aliphatic PNP iron complex as a mimic of the active center of [Fe]-hydrogenase for the hydrogenation of CO2.
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Affiliation(s)
- Xinzheng Yang
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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75
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Samanta S, Demesko S, Dechert S, Meyer F. A Two-in-one Pincer Ligand and its Diiron(II) Complex Showing Spin State Switching in Solution through Reversible Ligand Exchange. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408966] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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76
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Chakraborty S, Lagaditis PO, Förster M, Bielinski EA, Hazari N, Holthausen MC, Jones WD, Schneider S. Well-Defined Iron Catalysts for the Acceptorless Reversible Dehydrogenation-Hydrogenation of Alcohols and Ketones. ACS Catal 2014. [DOI: 10.1021/cs5009656] [Citation(s) in RCA: 293] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sumit Chakraborty
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Paraskevi O. Lagaditis
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstraße 4, 37077 Göttingen, Germany
| | - Moritz Förster
- Insitut für
Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Elizabeth A. Bielinski
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Nilay Hazari
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Max C. Holthausen
- Insitut für
Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - William D. Jones
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Sven Schneider
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstraße 4, 37077 Göttingen, Germany
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Bielinski EA, Lagaditis PO, Zhang Y, Mercado BQ, Würtele C, Bernskoetter WH, Hazari N, Schneider S. Lewis Acid-Assisted Formic Acid Dehydrogenation Using a Pincer-Supported Iron Catalyst. J Am Chem Soc 2014; 136:10234-7. [DOI: 10.1021/ja505241x] [Citation(s) in RCA: 331] [Impact Index Per Article: 33.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Elizabeth A. Bielinski
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Paraskevi O. Lagaditis
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße
4, 37077 Göttingen, Germany
| | - Yuanyuan Zhang
- Department
of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Brandon Q. Mercado
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Christian Würtele
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße
4, 37077 Göttingen, Germany
| | - Wesley H. Bernskoetter
- Department
of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Nilay Hazari
- Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Sven Schneider
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße
4, 37077 Göttingen, Germany
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78
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Mild and selective hydrogenation of aromatic and aliphatic (di)nitriles with a well-defined iron pincer complex. Nat Commun 2014; 5:4111. [PMID: 24969371 DOI: 10.1038/ncomms5111] [Citation(s) in RCA: 240] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 05/13/2014] [Indexed: 01/24/2023] Open
Abstract
The catalytic hydrogenation of carboxylic acid derivatives represents an atom-efficient and clean reduction methodology in organic chemistry. More specifically, the selective hydrogenation of nitriles offers the possibility for a green synthesis of valuable primary amines. So far, this transformation lacks of useful, broadly applicable non-noble metal-based catalyst systems. In the present study, we describe a molecular-defined iron complex, which allows for the hydrogenation of aryl, alkyl, heterocyclic nitriles and dinitriles. By using an iron PNP pincer complex, we achieve very good functional group tolerance. Ester, ether, acetamido as well as amino substituents are not reduced in the presence of nitriles. Moreover, nitriles including an α,β-unsaturated double bond and halogenated derivatives are well tolerated in this reaction. Notably, our complex constitutes the first example of an homogeneous catalyst, which permits the selective hydrogenation of industrially important adipodinitrile to 1,6-hexamethylenediamine.
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79
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Chakraborty S, Brennessel WW, Jones WD. A Molecular Iron Catalyst for the Acceptorless Dehydrogenation and Hydrogenation of N-Heterocycles. J Am Chem Soc 2014; 136:8564-7. [DOI: 10.1021/ja504523b] [Citation(s) in RCA: 371] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Sumit Chakraborty
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - William W. Brennessel
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - William D. Jones
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
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80
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Fillman KL, Bielinski EA, Schmeier TJ, Nesvet JC, Woodruff TM, Pan CJ, Takase MK, Hazari N, Neidig ML. Flexible Binding of PNP Pincer Ligands to Monomeric Iron Complexes. Inorg Chem 2014; 53:6066-72. [DOI: 10.1021/ic5004275] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Kathlyn L. Fillman
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Elizabeth A. Bielinski
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Timothy J. Schmeier
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Jared C. Nesvet
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Tessa M. Woodruff
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Cassie J. Pan
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Michael K. Takase
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Nilay Hazari
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Michael L. Neidig
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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81
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Werkmeister S, Junge K, Wendt B, Alberico E, Jiao H, Baumann W, Junge H, Gallou F, Beller M. Hydrierung von Estern zu Alkoholen mit einem definierten Eisenkomplex. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402542] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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82
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Werkmeister S, Junge K, Wendt B, Alberico E, Jiao H, Baumann W, Junge H, Gallou F, Beller M. Hydrogenation of Esters to Alcohols with a Well-Defined Iron Complex. Angew Chem Int Ed Engl 2014; 53:8722-6. [DOI: 10.1002/anie.201402542] [Citation(s) in RCA: 248] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Indexed: 12/20/2022]
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83
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Chakraborty S, Dai H, Bhattacharya P, Fairweather NT, Gibson MS, Krause JA, Guan H. Iron-Based Catalysts for the Hydrogenation of Esters to Alcohols. J Am Chem Soc 2014; 136:7869-72. [DOI: 10.1021/ja504034q] [Citation(s) in RCA: 274] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Sumit Chakraborty
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Huiguang Dai
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Papri Bhattacharya
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Neil T. Fairweather
- Procter & Gamble Company, 11510 Reed Hartman Highway, Cincinnati, Ohio 45241, United States
| | - Michael S. Gibson
- Procter & Gamble Company, 11510 Reed Hartman Highway, Cincinnati, Ohio 45241, United States
| | - Jeanette A. Krause
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Hairong Guan
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
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84
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Kumar A, Johnson HC, Hooper TN, Weller AS, Algarra AG, Macgregor SA. Multiple metal-bound oligomers from Ir-catalysed dehydropolymerisation of H3B·NH3 as probed by experiment and computation. Chem Sci 2014. [DOI: 10.1039/c4sc00735b] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Multiple metal-bound oligomers in the dehydropolymerisation of H3B·NH3 have been observed experimentally and the mechanism of oligomerisation probed computationally.
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Affiliation(s)
- Amit Kumar
- Department of Chemistry
- University of Oxford
- Oxford, UK
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