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Frieß S, Benyak A, Herrera A, Escalona AM, Heinemann FW, Langer J, Fehn D, Pividori D, Grasruck A, Munz D, Meyer K, Dorta R. Ir(IV) Sulfoxide-Pincer Complexes by Three-Electron Oxidative Additions of Br 2 and I 2. Unprecedented Trap-Free Reductive Elimination of I 2 from a formal d 5 Metal. Inorg Chem 2022; 61:1236-1248. [PMID: 34990121 DOI: 10.1021/acs.inorgchem.1c02956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxidative addition of 1.5 equiv of bromine or iodine to a Ir(I) sulfoxide pincer complex affords the corresponding Ir(IV) tris-bromido or tris-iodido complexes, respectively. The unprecedented trap-free reductive elimination of iodine from the Ir(IV)-iodido complex is induced by coordination of ligands or donor solvents. In the case of added I-, the isostructural tris-iodo Ir(III)-ate complex is quickly generated, which then can be readily reoxidized to the Ir(IV)-iodido complex with FcPF6 or electrochemically. DFT calculations indicate an "inverted ligand field" in the Ir(IV) complexes and favor dinuclear pathways for the reductive elimination of iodine from the formal d5 metal center.
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Affiliation(s)
- Sibylle Frieß
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Anna Benyak
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Alberto Herrera
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Ana M Escalona
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank W Heinemann
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Jens Langer
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Dominik Fehn
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Daniel Pividori
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Alexander Grasruck
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Dominik Munz
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany.,Anorganische Chemie: Koordinationschemie, Universität des Saarlandes, Campus Geb. C4.1, 66123 Saarbrücken, Germany
| | - Karsten Meyer
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Romano Dorta
- Department Chemie und Pharmazie, Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
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Zucca A, Pilo MI. Rollover Cyclometalation as a Valuable Tool for Regioselective C-H Bond Activation and Functionalization. Molecules 2021; 26:E328. [PMID: 33435257 PMCID: PMC7827749 DOI: 10.3390/molecules26020328] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/03/2021] [Accepted: 01/04/2021] [Indexed: 01/31/2023] Open
Abstract
Rollover cyclometalation constitutes a particular case of cyclometallation reaction. This reaction occurs when a chelated heterocyclic ligand loses its bidentate coordination mode and undergoes an internal rotation, after which a remote C-H bond is regioselectively activated, affording an uncommon cyclometalated complex, called "rollover cyclometalated complex". The key of the process is the internal rotation of the ligand, which occurs before the C-H bond activation and releases from coordination a donor atom. The new "rollover" ligand has peculiar properties, being a ligand with multiple personalities, no more a spectator in the reactivity of the complex. The main reason of this peculiarity is the presence of an uncoordinated donor atom (the one initially involved in the chelation), able to promote a series of reactions not available for classic cyclometalated complexes. The rollover reaction is highly regioselective, because the activated C-H bond is usually in a symmetric position with respect to the donor atom which detaches from the metal stating the rollover process. Due to this novel behavior, a series of potential applications have appeared in the literature, in fields such as catalysis, organic synthesis, and advanced materials.
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Affiliation(s)
- Antonio Zucca
- Department of Chemistry and Pharmacy, University of Sassari, via Vienna 2, 07100 Sassari, Italy;
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3
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Du L, Wang Z, Wu J. Iodobenzene-catalyzed oxidative cleavage of olefins to carbonyl compounds. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152204] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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Li X, Ouyang W, Nie J, Ji S, Chen Q, Huo Y. Recent Development on Cp*Ir(III)‐Catalyzed C−H Bond Functionalization. ChemCatChem 2020. [DOI: 10.1002/cctc.201902150] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Xianwei Li
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Wensen Ouyang
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Jianhong Nie
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Shaomin Ji
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Qian Chen
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
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Sarbajna A, He YT, Dinh MH, Gladkovskaya O, Rahaman SMW, Karimata A, Khaskin E, Lapointe S, Fayzullin RR, Khusnutdinova JR. Aryl–X Bond-Forming Reductive Elimination from High-Valent Mn–Aryl Complexes. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00494] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abir Sarbajna
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Yu-Tao He
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Minh Hoan Dinh
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Olga Gladkovskaya
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - S. M. Wahidur Rahaman
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Ayumu Karimata
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Eugene Khaskin
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Sébastien Lapointe
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Robert R. Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russian Federation
| | - Julia R. Khusnutdinova
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
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Leist M, Kerner C, Ghoochany LT, Farsadpour S, Fizia A, Neu JP, Schön F, Sun Y, Oelkers B, Lang J, Menges F, Niedner-Schatteburg G, Salih KS, Thiel WR. Roll-over cyclometalation: A versatile tool to enhance the catalytic activity of transition metal complexes. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.03.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Desnoyer AN, Love JA. Recent advances in well-defined, late transition metal complexes that make and/or break C-N, C-O and C-S bonds. Chem Soc Rev 2018; 46:197-238. [PMID: 27849097 DOI: 10.1039/c6cs00150e] [Citation(s) in RCA: 123] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Chemical transformations that result in either the formation or cleavage of carbon-heteroatom bonds are among the most important processes in the chemical sciences. Herein, we present a review on the reactivity of well-defined, late-transition metal complexes that result in the making and breaking of C-N, C-O and C-S bonds via fundamental organometallic reactions, i.e. oxidative addition, reductive elimination, insertion and elimination reactions. When appropriate, emphasis is placed on structural and spectroscopic characterization techniques, as well as mechanistic data.
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Affiliation(s)
- Addison N Desnoyer
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
| | - Jennifer A Love
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
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Adiraju VAK, Martin CD. C-H addition reactivity of 2-phenylpyridine and 2,2'-bipyridine with pentaphenylborole. Dalton Trans 2018; 46:10324-10331. [PMID: 28737800 DOI: 10.1039/c7dt02321a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The reactions of pentaphenylborole with pyridines with a pendent aryl group in the 2-position, specifically 2-phenylpyridine and 2,2'-bipyridine, readily afforded adducts. Upon thermolysis, the adducts converted to ortho C-H addition products with the two substituents introduced onto the diene on the boracyclic carbon atoms adjacent to boron in a syn fashion. Photolysis of the syn 2-phenypyridine product led to isomerization to the anti conformer which did not readily occur for the 2,2'-bipyridine complex. Such C-H bond reactivity is uncommon for main group elements and provides insight into methodologies to access boron frameworks.
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Affiliation(s)
- Venkata A K Adiraju
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
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9
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Atzrodt J, Derdau V, Kerr WJ, Reid M. Methoden der C-H-Funktionalisierung für den Wasserstoffisotopenaustausch. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201708903] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jens Atzrodt
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry; Industriepark Höchst, G876 65926 Frankfurt Deutschland
| | - Volker Derdau
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry; Industriepark Höchst, G876 65926 Frankfurt Deutschland
| | - William J. Kerr
- Department of Pure and Applied Chemistry, WestCHEM; University of Strathclyde; 295 Cathedral Street Glasgow Scotland G1 1XL Großbritannien
| | - Marc Reid
- Department of Pure and Applied Chemistry, WestCHEM; University of Strathclyde; 295 Cathedral Street Glasgow Scotland G1 1XL Großbritannien
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10
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Atzrodt J, Derdau V, Kerr WJ, Reid M. C-H Functionalisation for Hydrogen Isotope Exchange. Angew Chem Int Ed Engl 2018; 57:3022-3047. [PMID: 29024330 DOI: 10.1002/anie.201708903] [Citation(s) in RCA: 307] [Impact Index Per Article: 51.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Indexed: 11/06/2022]
Abstract
The various applications of hydrogen isotopes (deuterium, D, and tritium, T) in the physical and life sciences demand a range of methods for their installation in an array of molecular architectures. In this Review, we describe recent advances in synthetic C-H functionalisation for hydrogen isotope exchange.
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Affiliation(s)
- Jens Atzrodt
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry, Industriepark Höchst, G876, 65926, Frankfurt, Germany
| | - Volker Derdau
- Isotope Chemistry and Metabolite Synthesis, Integrated Drug Discovery, Medicinal Chemistry, Industriepark Höchst, G876, 65926, Frankfurt, Germany
| | - William J Kerr
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow, Scotland, G1 1XL, UK
| | - Marc Reid
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow, Scotland, G1 1XL, UK
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11
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More hydra than Janus – Non-classical coordination modes in complexes of oligopyridine ligands. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.06.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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12
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Tu Z, Tan J, Chen Z, Tu T. Iridium-Catalyzed Regio- and Stereoselective C-H Oxidative Reaction to (Z
)-3-Arylidene-2-oxindole Imides under Neutral Conditions. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700983] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhikai Tu
- Key Laboratory of Functional Small Organic Molecules; Ministry of Education, and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang Jiangxi 330022 People's Republic of China
| | - Jie Tan
- Key Laboratory of Functional Small Organic Molecules; Ministry of Education, and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang Jiangxi 330022 People's Republic of China
| | - Zhiyuan Chen
- Key Laboratory of Functional Small Organic Molecules; Ministry of Education, and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang Jiangxi 330022 People's Republic of China
| | - Tao Tu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials; Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
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Zucker SP, Wossidlo F, Weber M, Lentz D, Tzschucke CC. Palladium-Catalyzed Directed Halogenation of Bipyridine N-Oxides. J Org Chem 2017; 82:5616-5635. [PMID: 28537077 DOI: 10.1021/acs.joc.7b00444] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The palladium-catalyzed directed C-H halogenation of bipyridine N-oxides was investigated. Using NCS or NBS (N-chloro- or N-bromosuccinimide) and 5 mol % Pd(OAc)2 in chlorobenzene (0.10 molar) at 110 °C, pyridine-directed functionalization took place and 3-chloro- or 3-bromobipyridine N-oxides were obtained in high yields. The reaction is sensitive to steric hindrance by 4- and 6'-substituents. Only in the latter case, where coordination of palladium by the pyridine is hindered, 3'-halogenation directed by the N-oxide function was observed. The halogenated products were deoxygenated by PCl3 or PBr3.
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Affiliation(s)
- Sina P Zucker
- Freie Universität Berlin , Institut für Chemie und Biochemie, Takustrasse 3, 14195 Berlin, Germany
| | - Friedrich Wossidlo
- Freie Universität Berlin , Institut für Chemie und Biochemie, Takustrasse 3, 14195 Berlin, Germany
| | - Manuela Weber
- Freie Universität Berlin , Institut für Chemie und Biochemie, Takustrasse 3, 14195 Berlin, Germany
| | - Dieter Lentz
- Freie Universität Berlin , Institut für Chemie und Biochemie, Takustrasse 3, 14195 Berlin, Germany
| | - C Christoph Tzschucke
- Freie Universität Berlin , Institut für Chemie und Biochemie, Takustrasse 3, 14195 Berlin, Germany
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Hypervalent Iodine Reagents in High Valent Transition Metal Chemistry. Molecules 2017; 22:molecules22050780. [PMID: 28498333 PMCID: PMC6154742 DOI: 10.3390/molecules22050780] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 05/06/2017] [Accepted: 05/08/2017] [Indexed: 01/12/2023] Open
Abstract
Over the last 20 years, high valent metal complexes have evolved from mere curiosities to being at the forefront of modern catalytic method development. This approach has enabled transformations complimentary to those possible via traditional manifolds, most prominently carbon-heteroatom bond formation. Key to the advancement of this chemistry has been the identification of oxidants that are capable of accessing these high oxidation state complexes. The oxidant has to be both powerful enough to achieve the desired oxidation as well as provide heteroatom ligands for transfer to the metal center; these heteroatoms are often subsequently transferred to the substrate via reductive elimination. Herein we will review the central role that hypervalent iodine reagents have played in this aspect, providing an ideal balance of versatile reactivity, heteroatom ligands, and mild reaction conditions. Furthermore, these reagents are environmentally benign, non-toxic, and relatively inexpensive compared to other inorganic oxidants. We will cover advancements in both catalysis and high valent complex isolation with a key focus on the subtle effects that oxidant choice can have on reaction outcome, as well as limitations of current reagents.
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Shopov DY, Rudshteyn B, Campos J, Vinyard DJ, Batista VS, Brudvig GW, Crabtree RH. A full set of iridium(iv) pyridine-alkoxide stereoisomers: highly geometry-dependent redox properties. Chem Sci 2017; 8:1642-1652. [PMID: 28451293 PMCID: PMC5364517 DOI: 10.1039/c6sc03758e] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 11/06/2016] [Indexed: 11/21/2022] Open
Abstract
We introduce and characterize the complete set of possible isomers of IrIV(pyalk)2Cl2 (pyalk = 2-(pyridin-2-yl)propan-2-oate), providing valuable insights on the properties of Ir(iv) species. The pyridine alkoxide ligand strongly stabilizes high oxidation states, essential to accessing the catalytically relevant Ir(iv) state, and results in robust complexes that can be handled under ambient conditions, even permitting chromatographic separation. The redox properties are isomer-dependent, spanning a 300 mV range, rationalized with ligand-field theory and DFT calculations. The reported complexes exhibit very high kinetic inertness against isomerization, despite highly disparate predicted thermodynamic stabilities, presenting a unique opportunity to study all five possible isomeric complexes with the same ligand set.
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Affiliation(s)
- Dimitar Y Shopov
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
| | - Benjamin Rudshteyn
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
- Energy Sciences Institute , Yale University , 520 West Campus Dr. , West Haven , CT 06516 , United States
| | - Jesús Campos
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
- Instituto de Investigaciones Químicas (IIQ) , Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC) , Avenida Américo Vespucio 49 , 41092 Sevilla , Spain
| | - David J Vinyard
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
- Department of Biological Sciences , Louisiana State University , Baton Rouge , LA 70803 , USA
| | - Victor S Batista
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
- Energy Sciences Institute , Yale University , 520 West Campus Dr. , West Haven , CT 06516 , United States
| | - Gary W Brudvig
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
- Energy Sciences Institute , Yale University , 520 West Campus Dr. , West Haven , CT 06516 , United States
| | - Robert H Crabtree
- Department of Chemistry , Yale University , 225 Prospect St. , New Haven , CT 06520 , United States
- Energy Sciences Institute , Yale University , 520 West Campus Dr. , West Haven , CT 06516 , United States
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Abstract
The preparation, structure, and chemistry of hypervalent iodine compounds are reviewed with emphasis on their synthetic application. Compounds of iodine possess reactivity similar to that of transition metals, but have the advantage of environmental sustainability and efficient utilization of natural resources. These compounds are widely used in organic synthesis as selective oxidants and environmentally friendly reagents. Synthetic uses of hypervalent iodine reagents in halogenation reactions, various oxidations, rearrangements, aminations, C-C bond-forming reactions, and transition metal-catalyzed reactions are summarized and discussed. Recent discovery of hypervalent catalytic systems and recyclable reagents, and the development of new enantioselective reactions using chiral hypervalent iodine compounds represent a particularly important achievement in the field of hypervalent iodine chemistry. One of the goals of this Review is to attract the attention of the scientific community as to the benefits of using hypervalent iodine compounds as an environmentally sustainable alternative to heavy metals.
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Affiliation(s)
- Akira Yoshimura
- Department of Chemistry and Biochemistry, University of Minnesota Duluth , Duluth, Minnesota 55812, United States
| | - Viktor V Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth , Duluth, Minnesota 55812, United States
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Di Giuseppe A, Castarlenas R, Oro LA. Mechanistic considerations on catalytic H/D exchange mediated by organometallic transition metal complexes. CR CHIM 2015. [DOI: 10.1016/j.crci.2015.02.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhou M, Johnson SI, Gao Y, Emge TJ, Nielsen RJ, Goddard WA, Goldman AS. Activation and Oxidation of Mesitylene C–H Bonds by (Phebox)Iridium(III) Complexes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00200] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meng Zhou
- Department
of Chemistry and Chemical Biology, Rutgers New Brunswick, Busch Campus, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | | | - Yang Gao
- Department
of Chemistry and Chemical Biology, Rutgers New Brunswick, Busch Campus, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Thomas J. Emge
- Department
of Chemistry and Chemical Biology, Rutgers New Brunswick, Busch Campus, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | | | | | - Alan S. Goldman
- Department
of Chemistry and Chemical Biology, Rutgers New Brunswick, Busch Campus, 610 Taylor Road, Piscataway, New Jersey 08854, United States
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Alam P, Kaur G, Chakraborty S, Roy Choudhury A, Laskar IR. "Aggregation induced phosphorescence" active "rollover" iridium(III) complex as a multi-stimuli-responsive luminescence material. Dalton Trans 2015; 44:6581-92. [PMID: 25757518 DOI: 10.1039/c4dt03424d] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
On reaction of 2,2'-bipyridine with iridium(iii), an "aggregation induced phosphorescence (AIP)" active "rollover" complex, [Ir(PPh3)2(bipy-H)(Cl)(H)] (bipy-H = κ(2)-N,C-2,2'-bipyridine) or [Ir(bipy-H)], is obtained. The emission colour changes from bluish-green to yellowish-orange and vice versa after repeated protonation and deprotonation of [Ir(bipy-H)], respectively, which unequivocally supports its reversible nature. [Ir(bipy-H)] is sensitive to acids with different pKa values. Tuning of the emission properties can be achieved in the presence of acids with different pKas. This behaviour allows the complex, [Ir(bipy-H)], to function as a phosphorescent acid sensor in both solution and the solid state, as well as a chemosensor for detecting acidic and basic organic vapours. The protonated form, [Ir(bipy-H)H(+)], which is generated after protonation of [Ir(bipy-H)] can be used as a solvatochromic probe for oxygen containing solvents, and also shows vapochromic properties. The emission, absorption and (1)H NMR spectra of [Ir(bipy-H)] under acidic and basic conditions demonstrate its reversible nature. DFT based calculations suggest that changes in the electron affinity of the pyridinyl rings are responsible for all these processes.
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Affiliation(s)
- Parvej Alam
- Department of Chemistry, Birla Institute of Technology and Science, Pilani Campus, Pilani, Rajasthan, India.
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Fu R, O'Reilly ME, Nielsen RJ, Goddard III WA, Gunnoe TB. Rhodium Bis(quinolinyl)benzene Complexes for Methane Activation and Functionalization. Chemistry 2014; 21:1286-93. [DOI: 10.1002/chem.201405460] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Indexed: 11/07/2022]
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Joslin EE, Quillian B, Gunnoe TB, Cundari TR, Sabat M, Myers WH. C-H activation of pyrazolyl ligands by Ru(II). Inorg Chem 2014; 53:6270-9. [PMID: 24866703 DOI: 10.1021/ic500811n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Previously, hydridotris(pyrazolyl)borate (Tp) Ru(II) alkyl and aryl complexes of the type TpRu(L)(NCMe)R (R = methyl or aryl; L = charge-neutral two-electron donating ligand) were demonstrated to activate aromatic C-H bonds. To determine the impact of replacing the anionic Tp ligand with charge-neutral poly(pyrazolyl)alkane ligands, [(C(pz)4)Ru(P(OCH2)3CEt)(NCMe)Me][BAr'4] (pz = pyrazolyl, BAr'4 = tetrakis[3,5-bis(trifluoromethyl)phenyl]borate) was prepared. Heating a C6D6 solution of [(C(pz)4)Ru(P(OCH2)3CEt)(NCMe)Me][BAr'4] with 1 equiv of NCMe resulted in C-H activation of the 5-position of a pyrazolyl ring to yield [(κ(3)-(N,C(5),N)C(pz)4)Ru(P(OCH2)3CEt)(NCMe)2][BAr'4] and CH4. Intramolecular C-H activation of the 5-position of a pyrazolyl ring also occurred when (η(6)-p-cymene)Ru(P(OCH2)3CEt)(Br)Ph was heated in the presence of C(pz)4 to yield [(κ(3)-N,C(5),N)C(pz)4]Ru(P(OCH2)3CEt)(NCMe)Br and C6H6. Density functional theory calculations revealed that the different reactivities of TpRu(P(OCH2)3CEt)(NCMe)R and [(C(pz)4)Ru(P(OCH2)3CEt)(NCMe)Me][BAr'4] result from the stronger binding of the Tp pyrazolyl rings to Ru(II) compared to that of C(pz)4.
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Affiliation(s)
- Evan E Joslin
- Department of Chemistry, University of Virginia , Charlottesville, Virginia 22904, United States
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Kim H, Shin K, Chang S. Iridium-Catalyzed C–H Amination with Anilines at Room Temperature: Compatibility of Iridacycles with External Oxidants. J Am Chem Soc 2014; 136:5904-7. [DOI: 10.1021/ja502270y] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hyunwoo Kim
- Center
for Catalytic Hydrocarbon Functionalization, Institute of Basic Science (IBS), Daejeon 305-701, Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Korea
| | - Kwangmin Shin
- Center
for Catalytic Hydrocarbon Functionalization, Institute of Basic Science (IBS), Daejeon 305-701, Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Korea
| | - Sukbok Chang
- Center
for Catalytic Hydrocarbon Functionalization, Institute of Basic Science (IBS), Daejeon 305-701, Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Korea
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Ryu J, Kwak J, Shin K, Lee D, Chang S. Ir(III)-Catalyzed Mild C–H Amidation of Arenes and Alkenes: An Efficient Usage of Acyl Azides as the Nitrogen Source. J Am Chem Soc 2013; 135:12861-8. [DOI: 10.1021/ja406383h] [Citation(s) in RCA: 260] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jaeyune Ryu
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Jaesung Kwak
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Kwangmin Shin
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Donggun Lee
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Sukbok Chang
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
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25
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Manbeck KA, Brennessel WW, Jones WD. Examination of a dicationic rhodium methyl aquo complex. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.12.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Smeltz JL, Webster CE, Ison EA. Computational Investigation of the Mechanism for the Activation of CO by Oxorhenium Complexes. Organometallics 2012. [DOI: 10.1021/om3003366] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Jessica L. Smeltz
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North
Carolina 27695-8204, United States
| | - Charles Edwin Webster
- Department of Chemistry, 213 Smith Chemistry Building, The University of Memphis, Memphis, Tennessee 38138,
United States
| | - Elon A. Ison
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North
Carolina 27695-8204, United States
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29
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Petretto GL, Rourke JP, Maidich L, Stoccoro S, Cinellu MA, Minghetti G, Clarkson GJ, Zucca A. Heterobimetallic Rollover Derivatives. Organometallics 2012. [DOI: 10.1021/om200660a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Giacomo L. Petretto
- Dipartimento
di Chimica e Farmacia, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| | | | - Luca Maidich
- Dipartimento
di Chimica e Farmacia, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
| | - Sergio Stoccoro
- Dipartimento
di Chimica e Farmacia, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
| | - Maria Agostina Cinellu
- Dipartimento
di Chimica e Farmacia, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
| | - Giovanni Minghetti
- Dipartimento
di Chimica e Farmacia, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
| | - Guy J. Clarkson
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| | - Antonio Zucca
- Dipartimento
di Chimica e Farmacia, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
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Carsch KM, Cundari TR. DFT modeling of a methane-to-methanol catalytic cycle via Group 6 organometallics: The role of metal in determining the mode of C–H activation. COMPUT THEOR CHEM 2012. [DOI: 10.1016/j.comptc.2011.11.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Butschke B, Schwarz H. “Rollover” cyclometalation – early history, recent developments, mechanistic insights and application aspects. Chem Sci 2012. [DOI: 10.1039/c1sc00651g] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Fu R, Bercaw JE, Labinger JA. Intra- and Intermolecular C–H Activation by Bis(phenolate)pyridineiridium(III) Complexes. Organometallics 2011. [DOI: 10.1021/om201069k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Ross Fu
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - John E. Bercaw
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - Jay A. Labinger
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
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Figg TM, Cundari TR, Gunnoe TB. Non-redox Oxy-Insertion via Organometallic Baeyer–Villiger Transformations: A Computational Hammett Study of Platinum(II) Complexes. Organometallics 2011. [DOI: 10.1021/om200258d] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Travis M. Figg
- Center for Catalytic Hydrocarbon Functionalization, Department of Chemistry, and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, 1155 Union Circle, #305070, Denton, Texas 76203-5017, United States
| | - Thomas R. Cundari
- Center for Catalytic Hydrocarbon Functionalization, Department of Chemistry, and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, 1155 Union Circle, #305070, Denton, Texas 76203-5017, United States
| | - T. Brent Gunnoe
- Department of Chemistry, University of Virginia, McCormick Road, P.O. Box 400319; Charlottesville, Virginia 22904-4319, United States
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Zucca A, Cordeschi D, Stoccoro S, Cinellu MA, Minghetti G, Chelucci G, Manassero M. Platinum(II)-Cyclometalated “Roll-over” Complexes with a Chiral Pinene-Derived 2,2′-Bipyridine. Organometallics 2011. [DOI: 10.1021/om200172h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yusubov MS, Nemykin VN, Zhdankin VV. Transition metal-mediated oxidations utilizing monomeric iodosyl- and iodylarene species. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.046] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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36
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Yi XY, Chan KW, Huang EK, Sau YK, Williams ID, Leung WH. C-H Activation with Iridium(III) and Rhodium(III) Alkyl Complexes Containing a 2,2′-Bipyridyl Ligand. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Sinha A, Rahaman SMW, Sarkar M, Saha B, Daw P, Bera JK. Multifaceted coordination of naphthyridine-functionalized N-heterocyclic carbene: a novel "Ir(III)(C--N)(C--C)" compound and its evaluation as transfer hydrogenation catalyst. Inorg Chem 2010; 48:11114-22. [PMID: 19877708 DOI: 10.1021/ic901502n] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 1,8-naphthyridine-functionalized N-heterocyclic carbene 1-benzyl-3-(5,7-dimethyl-1,8-naphthyrid-2-yl)imidazol-2-ylidene (BIN) has been successfully coordinated to Pd(II), W(0), Rh(I), and Ir(III), exhibiting its diverse binding modes. Reaction of BIN x HBr with Ag(2)O, followed by transmetalation with PdCl(2)(COD)(2) provides a cis complex PdCl(2)(kappaC(2)-BIN)(2) (1). Treatment of BIN x HBr with W(CO)(4)(piperidine)(2) in acetonitrile affords a chelate complex W(CO)(4)(kappa(2)C(2),N(1)'-BIN) (2). Reaction of {RhCl(COD)}(2) with KO(t)Bu and subsequent treatment with BIN x HBr in 1:2 and 1:1 ratio results in the mono and dinuclear complexes [Rh(COD)Br(kappaC(2)-BIN)] (3) and [{Rh(COD)Br}(2)(kappaN(8)':kappaC(2)-BIN)] (4), respectively. In complex 3, the "Rh(COD)Br" unit is coordinated to the carbene center, whereas an additional "Rh(COD)Br" unit is attached to naphthyridine nitrogen in complex 4 in an anti arrangement. Under identical reaction condition, a novel Ir(III) complex [Ir(kappa(2)C(2),N(1)'-BIN)(kappa(2)C(3)',C(2)-BIN)(H(2)O)Br]Br (5) has been synthesized. Complex 5 is proved to be catalytically active in hydrogen transfer reaction from (i)PrOH. All complexes have been characterized by spectroscopic methods and X-ray crystallography.
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Affiliation(s)
- Arup Sinha
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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38
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Rohde JU, Lee WT. Stabilization of Iridium(IV) by Monoanionic Dialkyldiarylguanidinato Ligands. J Am Chem Soc 2009; 131:9162-3. [DOI: 10.1021/ja9033445] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan-Uwe Rohde
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242
| | - Wei-Tsung Lee
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242
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39
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Young KJH, Yousufuddin M, Ess DH, Periana RA. Cyclometalation of 6-Phenyl-2,2′-Bipyridine and Iridium: Synthesis, Characterization, and Reactivity Studies. Organometallics 2009. [DOI: 10.1021/om900014h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kenneth J. H. Young
- Donald P. Katherine B. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, and The Scripps Research Institute, Scripps Florida, Jupiter, Florida 33458
| | - Muhammed Yousufuddin
- Donald P. Katherine B. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, and The Scripps Research Institute, Scripps Florida, Jupiter, Florida 33458
| | - Daniel H. Ess
- Donald P. Katherine B. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, and The Scripps Research Institute, Scripps Florida, Jupiter, Florida 33458
| | - Roy A. Periana
- Donald P. Katherine B. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, and The Scripps Research Institute, Scripps Florida, Jupiter, Florida 33458
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40
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Young KJH, Oxgaard J, Ess DH, Meier SK, Stewart T, Goddard, III WA, Periana RA. Experimental realization of catalytic CH4 hydroxylation predicted for an iridium NNC pincer complex, demonstrating thermal, protic, and oxidant stability. Chem Commun (Camb) 2009:3270-2. [DOI: 10.1039/b823303a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Park-Gehrke LS, Freudenthal J, Kaminsky W, DiPasquale AG, Mayer JM. Synthesis and oxidation of Cp*IrIII compounds: functionalization of a Cp* methyl group. Dalton Trans 2009:1972-83. [DOI: 10.1039/b820839e] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Affiliation(s)
- Viktor V Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
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43
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Blackmore IJ, Semiao CJ, Buschhaus MSA, Patrick BO, Legzdins P. Investigations Directed at Catalytic Carbon−Carbon and Carbon−Oxygen Bond Formation via C−H Bond Activation. Organometallics 2007. [DOI: 10.1021/om700583q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ian J. Blackmore
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Christopher J. Semiao
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Miriam S. A. Buschhaus
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Brian O. Patrick
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Peter Legzdins
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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