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Miyazaki Y, Michigami K, Ohashi M. Isolation of Cationic η 3-Allenylnickel(II) Key Intermediate Complexes: Origins of Enantioselectivity and Regioselectivity in Nickel(0)-Catalyzed Asymmetric Propargylic Substitutions. J Am Chem Soc 2024; 146:8757-8767. [PMID: 38498989 DOI: 10.1021/jacs.4c01738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Herein, we report the synthesis and isolation of cationic η3-allenylnickel(II) complexes that bear rac-BINAP as a bidentate ligand for the first time via Me3SiOTf-promoted C-O bond cleavage of propargylic tert-butyl carbonate. In contrast, in the presence of the monodentate phosphine ligand PEt3, treatment of propargylic tert-butyl carbonate with Ni(cod)2 resulted in a gradual C-O bond cleavage leading to η1-allenylnickel(II) complexes, i.e., trans-(PEt3)2Ni(η1-CPh═C═CHR)(OBoc). X-ray diffraction and NMR spectroscopy studies of [(η3-RCH-CCPh)Ni(rac-BINAP)](OTf) revealed that the complex adopts an η3-allenyl coordination mode both in the crystal lattice and in solution. A thorough structural comparison between [(η3-RCH-CCPh)Ni(rac-BINAP)](OTf) and palladium and platinum analogues revealed that the η3-allenyl moiety in the nickel complex is similar to that observed in palladium and platinum complexes, albeit that each Ni-C bond is shorter than the corresponding Pd-C and Pt-C bonds due to the smaller ionic radius of nickel to that of Pd or Pt. The reactions of either N-methylaniline or sodium N-methylanilide with [(η3-RCH-CCPh)Ni((R)-BINAP)](OTf) furnished (R)-PhC≡CCH(NMePh)Me as an asymmetric propargylic substitution (APS) product with excellent enantioselectivity. Furthermore, when the nickel-catalyzed APS reaction of propargylic tert-butyl carbonate with N-methylaniline was conducted in DMSO at 60 °C in the presence of 5 mol % of [(η3-RCH-CCPh)Ni((R)-BINAP)](OTf) and 7.5 mol % of sodium N-methylanilide as a catalytic precursor and an additive, respectively, (R)-PhC≡CCH(NMePh)Me was obtained in 79% yield with 90% ee. The experimental results and computational calculations strongly suggest that the nickel-catalyzed APS reaction might proceed via a cationic η3-allenylnickel(II) species as the key reaction intermediate.
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Affiliation(s)
- Yusuke Miyazaki
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Kenichi Michigami
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sugimoto, Sumiyoshi-Ku, Osaka 558-8585, Japan
| | - Masato Ohashi
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sugimoto, Sumiyoshi-Ku, Osaka 558-8585, Japan
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Kuramochi Y, Suzuki Y, Asai S, Suzuki T, Iwama H, Asano MS, Satake A. Significance of the connecting position between Zn(ii) porphyrin and Re(i) bipyridine tricarbonyl complex units in dyads for room-temperature phosphorescence and photocatalytic CO 2 reduction: unexpected enhancement by triethanolamine in catalytic activity. Chem Sci 2023; 14:8743-8765. [PMID: 37621430 PMCID: PMC10445468 DOI: 10.1039/d3sc02430j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 07/14/2023] [Indexed: 08/26/2023] Open
Abstract
We synthesized three new dyads composed of a Zn porphyrin and fac-Re(bpy)(CO)3Br (bpy = 2,2'-bipyridine) units, ZnP-nBpy[double bond, length as m-dash]ReBr (n = 4, 5, and 6), in which the porphyrin is directly connected at the meso-position through the 4-, 5-, or 6-position of the bpy. We investigated the relationships between the connecting positions and the photophysical properties as well as catalytic activity in the CO2 reduction reaction. The dyad connected through the 6-position, ZnP-6Bpy[double bond, length as m-dash]ReBr, showed obvious phosphorescence with a lifetime of 280 μs at room temperature, in N,N-dimethylacetamide (DMA), whereas the other two dyads showed almost no phosphorescence under the same conditions. The photocatalytic CO2 reduction reactions in DMA using 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole as the electron donor and the three dyads ZnP-nBpy[double bond, length as m-dash]ReBr selectively produced CO with similar initial rates, but the durabilities were low. The addition of triethanolamine (TEOA) suppressed the decomposition of dyads, improving their durabilities and reaction efficiencies. In particular, ZnP-5Bpy[double bond, length as m-dash]ReBr was remarkably improved-it gave the highest durability and reaction efficiency among the three dyads; the reaction quantum yield reached 24%. The reason for this significant activity is no accumulation of electrons on the Zn porphyrin in ZnP-5Bpy[double bond, length as m-dash]ReBr, which would be caused by dual interactions of TEOA with the Re and Zn ions in the dyad. As the highest catalytic activity was observed in ZnP-5Bpy[double bond, length as m-dash]ReBr among the three dyads, which had no room-temperature phosphorescence (RTP), the catalytic activities and RTP properties are considered independent, but they are greatly influenced by the connecting positions on the bpy ligand in ZnP-nBpy[double bond, length as m-dash]ReBr.
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Affiliation(s)
- Yusuke Kuramochi
- Department of Chemistry, Graduate School of Science, Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8621 Japan
- Department of Chemistry, Faculty of Science Division II, Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8621 Japan
| | - Yuto Suzuki
- Department of Chemistry, Graduate School of Science, Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8621 Japan
| | - Somyo Asai
- Division of Molecular Science, School of Science and Technology, Gunma University 1-5-1 Tenjin-cho Kiryu Gunma 376-8515 Japan
| | - Tomohiro Suzuki
- Division of Molecular Science, School of Science and Technology, Gunma University 1-5-1 Tenjin-cho Kiryu Gunma 376-8515 Japan
| | - Hiroki Iwama
- Department of Applied Chemistry, Faculty of Science Division I, Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8621 Japan
| | - Motoko S Asano
- Division of Molecular Science, School of Science and Technology, Gunma University 1-5-1 Tenjin-cho Kiryu Gunma 376-8515 Japan
| | - Akiharu Satake
- Department of Chemistry, Graduate School of Science, Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8621 Japan
- Department of Chemistry, Faculty of Science Division II, Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku Tokyo 162-8621 Japan
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Yamazaki Y, Miyaji M, Ishitani O. Utilization of Low-Concentration CO 2 with Molecular Catalysts Assisted by CO 2-Capturing Ability of Catalysts, Additives, or Reaction Media. J Am Chem Soc 2022; 144:6640-6660. [PMID: 35404601 DOI: 10.1021/jacs.2c02245] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Increasing concentration of atmospheric CO2 is a worldwide concern and continues to trigger various environmental problems. Photo- or electrocatalytic CO2 reduction (CO2-Red) using solar energy, i.e., artificial photosynthesis, is a prospective technique owing to its sustainability and the usefulness of the reaction products. Concentrations of CO2 in exhaust gases from industries are several % to 20%, and that in the atmosphere is about 400 ppm. Although condensation processes of CO2 require high energy consumption and cost, pure CO2 has been used in most of the reported studies for photo- and electrocatalytic CO2-Red because the reaction between CO2 and the catalyst could be one of the rate-limiting steps. To address these issues and provide a repository of potential techniques for other researchers, this perspective summarizes the catalytic systems reported for the reduction of low-concentration CO2, which utilize a combination of catalytic CO2-Red and CO2-capturing reactions (or CO2 adsorption). First, we describe CO2 insertions into M-X bonds of the catalysts, which increase the rate constants and/or equilibrium constants for CO2 binding on the catalysts, and modifications of the second coordination sphere to stabilize the CO2-bound catalysts. Furthermore, we discuss the reaction media used for catalytic CO2-Red that have the unique effect of increasing CO2 concentrations around the catalysts. These reaction media include typical CO2-capturing additives, ionic liquids, and metal-organic frameworks.
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Affiliation(s)
- Yasuomi Yamazaki
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijoji-Kitamachi, Musashino-shi, Tokyo 180-8633, Japan
| | - Masahiko Miyaji
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 NE-1, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Osamu Ishitani
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 NE-1, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
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Takeuchi K, Chen MY, Yuan HY, Koizumi H, Matsumoto K, Fukaya N, Choe YK, Shigeyasu S, Matsumoto S, Hamura S, Choi JC. N-Aryl and N-Alkyl Carbamates from 1 Atmosphere of CO 2. Chemistry 2021; 27:18066-18073. [PMID: 34779056 DOI: 10.1002/chem.202103587] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Indexed: 11/09/2022]
Abstract
We have successfully isolated and characterized the zinc carbamate complex (phen)Zn(OAc)(OC(=O)NHPh) (1; phen=1,10-phenanthroline), formed as an intermediate during the Zn(OAc)2 /phen-catalyzed synthesis of organic carbamates from CO2 , amines, and the reusable reactant Si(OMe)4 . Density functional theory calculations revealed that the direct reaction of 1 with Si(OMe)4 proceeds via a five-coordinate silicon intermediate, forming organic carbamates. Based on these results, the catalytic system was improved by using Si(OMe)4 as the reaction solvent and additives like KOMe and KF, which promote the formation of the five-coordinated silicon species. This sustainable and effective method can be used to synthesize various N-aryl and N-alkyl carbamates, including industrially important polyurethane raw materials, starting from CO2 under atmospheric pressure.
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Affiliation(s)
- Katsuhiko Takeuchi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Ming-Yu Chen
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan.,Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8573, Ibaraki, Japan
| | - Hao-Yu Yuan
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Hiroki Koizumi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Kazuhiro Matsumoto
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Norihisa Fukaya
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Yoong-Kee Choe
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Shinji Shigeyasu
- Polyurethane Research Laboratory Tosoh Corporation, 1-8 Kasumi, Yokkaichi, Mie, 510-8540, Japan
| | - Seiji Matsumoto
- Tosoh Corporation, 3-8-2 Shiba, Minato-ku, Tokyo, 105-8623, Japan
| | - Satoshi Hamura
- Tosoh Corporation, 3-8-2 Shiba, Minato-ku, Tokyo, 105-8623, Japan
| | - Jun-Chul Choi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan.,Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8573, Ibaraki, Japan
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Martínez‐Prieto LM, Río D, Álvarez E, Palma P, Cámpora J. Nucleophilic Nickel and Palladium Pincer Hydroxides: A Study of Their Reactions with Dimethyl Carbonate and Other Non‐Alkylating Organic Electrophiles. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Luis M. Martínez‐Prieto
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
- Instituto de Tecnología Química CSIC-Universidad Politécnica de Valencia Avda. de Los Naranjos, s/n. 46022 Valencia Spain
| | - Diego Río
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
| | - Pilar Palma
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
| | - Juan Cámpora
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
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Bresciani G, Biancalana L, Pampaloni G, Marchetti F. Recent Advances in the Chemistry of Metal Carbamates. Molecules 2020; 25:E3603. [PMID: 32784784 PMCID: PMC7465543 DOI: 10.3390/molecules25163603] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 07/31/2020] [Accepted: 08/03/2020] [Indexed: 12/12/2022] Open
Abstract
Following a related review dating back to 2003, the present review discusses in detail the various synthetic, structural and reactivity aspects of metal species containing one or more carbamato ligands, representing a large family of compounds across all the periodic table. A preliminary overview is provided on the reactivity of carbon dioxide with amines, and emphasis is given to recent findings concerning applications in various fields.
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Affiliation(s)
| | | | - Guido Pampaloni
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy; (G.B.); (L.B.)
| | - Fabio Marchetti
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy; (G.B.); (L.B.)
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Martínez‐Prieto LM, Cámpora J. Nickel and Palladium Complexes with Reactive σ‐Metal‐Oxygen Covalent Bonds. Isr J Chem 2020. [DOI: 10.1002/ijch.202000001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Luis M. Martínez‐Prieto
- Instituto de Tecnología Química. CSIC –Universidad Politécnica de Valencia Avda. Los Naranjos, S/N 46022 Valencia Spain
| | - Juan Cámpora
- Instituto de Investigaciones Químicas, CSIC –Universidad de Sevilla. C/ Américo Vespucio, 49. 41092 Seville Spain
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