1
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Awasthi A, Mallojjala SC, Kumar R, Eerlapally R, Hirschi JS, Draksharapu A. Altering the Localization of an Unpaired Spin in a Formal Ni(V) Species. Chemistry 2024; 30:e202302824. [PMID: 37903027 PMCID: PMC10841873 DOI: 10.1002/chem.202302824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/28/2023] [Accepted: 10/30/2023] [Indexed: 11/01/2023]
Abstract
The participation of both ligand and the metal center in the redox events has been recognized as one of the ways to attain the formal high valent complexes for the late 3d metals, such as Ni and Cu. Such an approach has been employed successfully to stabilize a Ni(III) bisphenoxyl diradical species in which there exist an equilibrium between the ligand and the Ni localized resultant spin. The present work, however, broadens the scope of the previously reported three oxidized equivalent species by conveying the approaches that tend to affect the reported equilibrium in CH3 CN at 233 K. Various spectroscopic characterization revealed that employing exogenous N-donor ligands like 1-methyl imidazole and pyridine favors the formation of the Ni centered localized spin though axial binding. In contrast, due to its steric hinderance, quinoline favors an exclusive ligand localized radical species. DFT studies shed light on the novel intermediates' complex electronic structure. Further, the three oxidized equivalent species with the Ni centered spin was examined for its hydrogen atom abstraction ability stressing their key role in alike reactions.
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Affiliation(s)
- Ayushi Awasthi
- Southern Laboratories-208 A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | | | - Rakesh Kumar
- Southern Laboratories-208 A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Raju Eerlapally
- Southern Laboratories-208 A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Jennifer S Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York, 13902, USA
| | - Apparao Draksharapu
- Southern Laboratories-208 A, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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2
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Vil’ VA, Barsegyan YA, Kuhn L, Terent’ev AO, Alabugin IV. Creating, Preserving, and Directing Carboxylate Radicals in Ni-Catalyzed C(sp 3)–H Acyloxylation of Ethers, Ketones, and Alkanes with Diacyl Peroxides. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Affiliation(s)
- Vera A. Vil’
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, Moscow 119991, Russian Federation
| | - Yana A. Barsegyan
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, Moscow 119991, Russian Federation
| | - Leah Kuhn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Fl 32306, United States
| | - Alexander O. Terent’ev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, Moscow 119991, Russian Federation
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Fl 32306, United States
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3
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The once-elusive Ni(IV) species is now a potent candidate for challenging organic transformations. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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4
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Deolka S, Govindarajan R, Vasylevskyi S, Roy MC, Khusnutdinova JR, Khaskin E. Ligand-free nickel catalyzed perfluoroalkylation of arenes and heteroarenes. Chem Sci 2022; 13:12971-12979. [PMID: 36425484 PMCID: PMC9667918 DOI: 10.1039/d2sc03879j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 10/13/2022] [Indexed: 11/07/2023] Open
Abstract
We describe a "ligand-free" Ni-catalyzed perfluoroalkylation of heteroarenes to produce a diverse array of trfiluoromethyl, pentafluoroethyl and heptafluoropropyl adducts. Catalysis proceeds at room temperature via a radical pathway. The catalytic protocol is distinguished by its simplicity, and its wide scope demonstrates the potential in the late-stage functionalization of drug analogues and peptides.
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Affiliation(s)
- Shubham Deolka
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son 904-0495 Okinawa Japan
| | - Ramadoss Govindarajan
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son 904-0495 Okinawa Japan
| | - Serhii Vasylevskyi
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son 904-0495 Okinawa Japan
| | - Michael C Roy
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son 904-0495 Okinawa Japan
| | - Julia R Khusnutdinova
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son 904-0495 Okinawa Japan
| | - Eugene Khaskin
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son 904-0495 Okinawa Japan
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5
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Milbauer MW, Kampf JW, Sanford MS. Nickel(IV) Intermediates in Aminoquinoline-Directed C(sp 2)–C(sp 3) Coupling. J Am Chem Soc 2022; 144:21030-21034. [DOI: 10.1021/jacs.2c10778] [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)
- Michael W. Milbauer
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jeff W. Kampf
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Melanie S. Sanford
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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6
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Awasthi A, Leach IF, Engbers S, Kumar R, Eerlapally R, Gupta S, Klein JEMN, Draksharapu A. Formation and Reactivity of a Fleeting Ni III Bisphenoxyl Diradical Species. Angew Chem Int Ed Engl 2022; 61:e202211345. [PMID: 35978531 PMCID: PMC9826141 DOI: 10.1002/anie.202211345] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Indexed: 01/11/2023]
Abstract
Cytochrome P450s and Galactose Oxidases exploit redox active ligands to form reactive high valent intermediates for oxidation reactions. This strategy works well for the late 3d metals where accessing high valent states is rather challenging. Herein, we report the oxidation of NiII (salen) (salen=N,N'-bis(3,5-di-tert-butyl-salicylidene)-1,2-cyclohexane-(1R,2R)-diamine) with mCPBA (meta-chloroperoxybenzoic acid) to form a fleeting NiIII bisphenoxyl diradical species, in CH3 CN and CH2 Cl2 at -40 °C. Electrochemical and spectroscopic analyses using UV/Vis, EPR, and resonance Raman spectroscopies revealed oxidation events both on the ligand and the metal centre to yield a NiIII bisphenoxyl diradical species. DFT calculations found the electronic structure of the ligand and the d-configuration of the metal center to be consistent with a NiIII bisphenoxyl diradical species. This three electron oxidized species can perform hydrogen atom abstraction and oxygen atom transfer reactions.
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Affiliation(s)
- Ayushi Awasthi
- Southern Laboratories-208 ADepartment of ChemistryIndian Institute of Technology KanpurKanpur208016India
| | - Isaac F. Leach
- Molecular Inorganic ChemistryStratingh Institute for ChemistryUniversity of Groningen9747 AGGroningenThe Netherlands
| | - Silène Engbers
- Molecular Inorganic ChemistryStratingh Institute for ChemistryUniversity of Groningen9747 AGGroningenThe Netherlands
| | - Rakesh Kumar
- Southern Laboratories-208 ADepartment of ChemistryIndian Institute of Technology KanpurKanpur208016India
| | - Raju Eerlapally
- Southern Laboratories-208 ADepartment of ChemistryIndian Institute of Technology KanpurKanpur208016India
| | - Sikha Gupta
- Southern Laboratories-208 ADepartment of ChemistryIndian Institute of Technology KanpurKanpur208016India
| | - Johannes E. M. N. Klein
- Molecular Inorganic ChemistryStratingh Institute for ChemistryUniversity of Groningen9747 AGGroningenThe Netherlands
| | - Apparao Draksharapu
- Southern Laboratories-208 ADepartment of ChemistryIndian Institute of Technology KanpurKanpur208016India
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7
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Tricoire M, Wang D, Rajeshkumar T, Maron L, Danoun G, Nocton G. Electron Shuttle in N-Heteroaromatic Ni Catalysts for Alkene Isomerization. JACS AU 2022; 2:1881-1888. [PMID: 36032537 PMCID: PMC9400170 DOI: 10.1021/jacsau.2c00251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Simple N-heteroaromatic Ni(II) precatalysts, (L)NiMe2 (L = bipy, bipym), were used for alkene isomerization. With an original reduction method using a simple borane (HB(Cat)), a low-valent Ni center was formed readily and showed good conversion when a reducing divalent lanthanide fragment, Cp*2Yb, was coordinated to the (bipym)NiMe2 complex, a performance not achieved by the monometallic (bipy)NiMe2 analogue. Experimental mechanistic investigations and computational studies revealed that the redox non-innocence of the L ligand triggered an electron shuttle process, allowing the elusive formation of Ni(I) species that were central to the isomerization process. Additionally, the reaction occurred with a preference for mono-isomerization rather than chain-walking isomerization. The presence of the low-valent ytterbium fragment, which contributed to the formation of the electron shuttle, strongly stabilized the catalysts, allowing catalytic loading as low as 0.5%. A series of alkenes with various architectures have been tested. The possibility to easily tune the various components of the heterobimetallic catalyst reported here, the ligand L and the divalent lanthanide fragment, opens perspectives for further applications in catalysis induced by Ni(I) species.
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Affiliation(s)
- Maxime Tricoire
- LCM,
CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route
de Saclay, 91120 Palaiseau, France
| | - Ding Wang
- LCM,
CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route
de Saclay, 91120 Palaiseau, France
| | - Thayalan Rajeshkumar
- LPCNO,
UMR 5215, Université de Toulouse-CNRS, INSA, UPS, 31077 Toulouse
cedex 4, France
| | - Laurent Maron
- LPCNO,
UMR 5215, Université de Toulouse-CNRS, INSA, UPS, 31077 Toulouse
cedex 4, France
| | - Grégory Danoun
- LCM,
CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route
de Saclay, 91120 Palaiseau, France
| | - Grégory Nocton
- LCM,
CNRS, Ecole polytechnique, Institut Polytechnique de Paris, Route
de Saclay, 91120 Palaiseau, France
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8
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Awasthi A, Leach IF, Engbers S, Kumar R, Eerlapally R, Gupta S, Klein JEMN, Draksharapu A. Formation and Reactivity of a Fleeting Ni(III) Bisphenoxyl Diradical Species. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202211345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Isaac F. Leach
- University of Groningen Zernike Institute for Advanced Materials: Rijksuniversiteit Groningen Zernike Institute for Advanced Materials Stratingh Institute for Chemistry NETHERLANDS
| | - Silène Engbers
- University of Groningen Zernike Institute for Advanced Materials: Rijksuniversiteit Groningen Zernike Institute for Advanced Materials Stratingh Institute for Chemistry NETHERLANDS
| | - Rakesh Kumar
- Indian Institute of Technology Kanpur Chemistry INDIA
| | | | - Sikha Gupta
- Indian Institute of Technology Kanpur Chemistry INDIA
| | - Johannes E. M. N. Klein
- University of Groningen Zernike Institute for Advanced Materials: Rijksuniversiteit Groningen Zernike Institute for Advanced Materials Stratingh Institute for Chemistry NETHERLANDS
| | - Apparao Draksharapu
- IITK: Indian Institute of Technology Kanpur Chemistry SL-208A 208016 Kanpur INDIA
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9
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Mkrtchyan S, Jakubczyk M, Lanka S, Yar M, Mahmood T, Ayub K, Sillanpää M, Thomas. C, Iaroshenko V. Mechanochemical Ni‐catalysed arylation of ortho‐hydroxyarylenaminones: Synthesis of isoflavones. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Satenik Mkrtchyan
- Laboratory of Homogeneous Catalysis and Molecular Design at Center of Molecular and Macromolecular Studies, Polish Academy of Sciences. POLAND
| | - Michał Jakubczyk
- Institute of Bioorganic Chemistry Polish Academy of Sciences POLAND
| | | | | | | | | | - Mika Sillanpää
- f. Department of Biological and Chemical Engineering, Aarhus University, Nørrebrogade 44, Aarhus C (Denmark). DENMARK
| | | | - Viktor Iaroshenko
- Laboratory of Homogeneous Catalysis and Molecular Design at Center of Molecular and Macromolecular Studies in Lodz POLAND
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10
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Chachkov DV, Mikhailov OV. Nickel macrocyclic complexes with porphyrazine and some [benzo]substituted, oxo and fluoro ligands: DFT analysis. J PORPHYR PHTHALOCYA 2022. [DOI: 10.1142/s1088424622500067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
By using quantum chemical calculation data obtained by the DFT method with the OPBE/TZVP and B3PW91/TZVP levels, the principal possibility of the existence of three heteroligand complexes of nickel, each of which was shown to contain in the inner coordination sphere either porphyrazine or di[benzo]- and tetra[benzo]porphyrazine, oxygen (O[Formula: see text] and fluorine (F[Formula: see text] ions. The data on the geometric parameters of the molecular structure of these complexes are presented; which shows that NiN4 chelate nodes, all metal-chelate and non-chelate cycles in each of these complexes, are strictly planar. The bond angles between two donor nitrogen atoms and a nickel atom are equal to 90[Formula: see text], while the bond angles between donor atoms N, Ni, and O or F, in most cases, albeit insignificantly, differ from this value. Nevertheless, the bond angles formed by Ni, O and F atoms are exactly 180[Formula: see text]. NBO analysis data for these complexes are presented; it was noted that the ground state of all these complexes was a spin doublet. It has been shown that a good agreement between the data obtained using the above two versions of the DFT method occurs. Also, standard thermodynamic parameters of formation (standard enthalpy [Formula: see text], entropy [Formula: see text] and Gibbs’s energy [Formula: see text] for the macrocyclic compounds under consideration were calculated.
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Affiliation(s)
- Denis V. Chachkov
- Kazan Department of Joint Supercomputer Center of Russian Academy of Sciences – Branch of Federal Scientific Center “Scientific Research Institute for System Analysis of the RAS”, Lobachevski Street 2/31, 420111 Kazan, Russia
| | - Oleg V. Mikhailov
- Kazan National Research Technological University, K. Marx Street 68, 420015 Kazan, Russia
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11
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Affiliation(s)
- Victor M. Chernyshev
- Platov South-Russian State Polytechnic University (NPI), Novocherkassk, 346428, Russia
| | - Valentine P. Ananikov
- Platov South-Russian State Polytechnic University (NPI), Novocherkassk, 346428, Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia
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12
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Panza N, Tseberlidis G, Caselli A, Vicente R. Recent progresses in the chemistry of 12-membered pyridine-containing tetraazamacrocycles: From synthesis to catalysis. Dalton Trans 2022; 51:10635-10657. [DOI: 10.1039/d2dt00597b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article provides an overview (non-comprehensive) on recent developments regarding pyridine-containing 12-membered tetraazamacrocycles with pyclen or Py2N2 backbones and their metal complexes from 2017 to the present. Firstly, the synthesis...
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13
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Sabapathi G, Venuvanalingam P. Oxidative C–C/C–X coupling in organometallic nickel complexes: insights from DFT. NEW J CHEM 2022. [DOI: 10.1039/d2nj02480b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NiIII and NiIV-center complexes prefer direct reductive elimination than reacting through five-coordinate intermediates. 32+ complex in the presence of Cl− undergoes Cl–Csp2 elimination preferably over Cl–Csp3 and Csp3–Csp2 elimination.
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Affiliation(s)
- Gopal Sabapathi
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli 620024, India
| | - Ponnambalam Venuvanalingam
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli 620024, India
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14
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Deolka S, Govindarajan R, Khaskin E, Fayzullin RR, Roy MC, Khusnutdinova JR. Photoinduced Trifluoromethylation of Arenes and Heteroarenes Catalyzed by High-Valent Nickel Complexes. Angew Chem Int Ed Engl 2021; 60:24620-24629. [PMID: 34477296 DOI: 10.1002/anie.202109953] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Indexed: 12/30/2022]
Abstract
We describe a series of air-stable NiIII complexes supported by a simple, robust naphthyridine-based ligand. Access to the high-valent oxidation state is enabled by the CF3 ligands on the nickel, while the naphthyridine exhibits either a monodentate or bidentate coordination mode that depends on the oxidation state and sterics, and enables facile aerobic oxidation of NiII to NiIII . These NiIII complexes act as efficient catalysts for photoinduced C(sp2 )-H bond trifluoromethylation reactions of (hetero)arenes using versatile synthetic protocols. This blue LED light-mediated catalytic protocol proceeds via a radical pathway and demonstrates potential in the late-stage functionalization of drug analogs.
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Affiliation(s)
- Shubham Deolka
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan
| | - Ramadoss Govindarajan
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan
| | - Eugene Khaskin
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan
| | - Robert R Fayzullin
- Abuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov Street, Kazan, 420088, Russian Federation
| | - Michael C Roy
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan
| | - Julia R Khusnutdinova
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan
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15
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Deolka S, Govindarajan R, Khaskin E, Fayzullin RR, Roy MC, Khusnutdinova JR. Photoinduced Trifluoromethylation of Arenes and Heteroarenes Catalyzed by High‐Valent Nickel Complexes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109953] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Shubham Deolka
- Okinawa Institute of Science and Technology Graduate University Onna-son, Kunigami-gun Okinawa 904-0495 Japan
| | - Ramadoss Govindarajan
- Okinawa Institute of Science and Technology Graduate University Onna-son, Kunigami-gun Okinawa 904-0495 Japan
| | - Eugene Khaskin
- Okinawa Institute of Science and Technology Graduate University Onna-son, Kunigami-gun Okinawa 904-0495 Japan
| | - Robert R. Fayzullin
- Abuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific Center of RAS 8 Arbuzov Street Kazan 420088 Russian Federation
| | - Michael C. Roy
- Okinawa Institute of Science and Technology Graduate University Onna-son, Kunigami-gun Okinawa 904-0495 Japan
| | - Julia R. Khusnutdinova
- Okinawa Institute of Science and Technology Graduate University Onna-son, Kunigami-gun Okinawa 904-0495 Japan
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16
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Yruegas S, Tang H, Bornovski GZ, Su X, Sung S, Hall MB, Nippe M, Martin CD. Nickel-Borolide Complexes and Their Complex Electronic Structure. Inorg Chem 2021; 60:16160-16167. [PMID: 34637613 DOI: 10.1021/acs.inorgchem.1c01845] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Borolides (BC42-) can be considered as dianionic heterocyclic analogues of monoanionic cyclopentadienides. Although both are formally six-π-electron donors, we herein demonstrate that the electronic structure of their corresponding transition metal complexes differs significantly, leading to altered properties. Specifically, the 18-electron sandwich complex Ni(iPr2NBC4Ph2)2 (1) features an ∼90° angle between the Ni-B-N planes and is best described as a combination of three limiting resonance structures with the major contribution stemming from a formally Ni2+ species bound to two monoanionic radical (BC4•-) ligands. Compound 1 displays two sequential one-electron oxidation events over a small potential range of <0.2 V, which strikingly contrasts the large potential separations between redox partners in the family of metallocenes, and the potential reasons for this unusual observation are discussed.
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Affiliation(s)
- Sam Yruegas
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Hao Tang
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Gayle Z Bornovski
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Xiaojun Su
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Siyoung Sung
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Michael B Hall
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Michael Nippe
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Caleb D Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
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17
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Synthesis and characterization of the dinuclear cobalt(III) complex: [(C2F5)3Co(μ-F)]22−. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Lutz S, Nattmann L, Nöthling N, Cornella J. 16-Electron Nickel(0)-Olefin Complexes in Low-Temperature C(sp2)–C(sp3) Kumada Cross-Couplings. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00775] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sigrid Lutz
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Lukas Nattmann
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Nils Nöthling
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
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19
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Le Vaillant F, Reijerse EJ, Leutzsch M, Cornella J. Dialkyl Ether Formation at High-Valent Nickel. J Am Chem Soc 2020; 142:19540-19550. [PMID: 33143423 PMCID: PMC7677934 DOI: 10.1021/jacs.0c07381] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Indexed: 12/15/2022]
Abstract
In this article, we investigated the I2-promoted cyclic dialkyl ether formation from 6-membered oxanickelacycles originally reported by Hillhouse. A detailed mechanistic investigation based on spectroscopic and crystallographic analysis revealed that a putative reductive elimination to forge C(sp3)-OC(sp3) using I2 might not be operative. We isolated a paramagnetic bimetallic NiIII intermediate featuring a unique Ni2(OR)2 (OR = alkoxide) diamond-like core complemented by a μ-iodo bridge between the two Ni centers, which remains stable at low temperatures, thus permitting its characterization by NMR, EPR, X-ray, and HRMS. At higher temperatures (>-10 °C), such bimetallic intermediate thermally decomposes to afford large amounts of elimination products together with iodoalkanols. Observation of the latter suggests that a C(sp3)-I bond reductive elimination occurs preferentially to any other challenging C-O bond reductive elimination. Formation of cyclized THF rings is then believed to occur through cyclization of an alcohol/alkoxide to the recently forged C(sp3)-I bond. The results of this article indicate that the use of F+ oxidants permits the challenging C(sp3)-OC(sp3) bond formation at a high-valent nickel center to proceed in good yields while minimizing deleterious elimination reactions. Preliminary investigations suggest the involvement of a high-valent bimetallic NiIII intermediate which rapidly extrudes the C-O bond product at remarkably low temperatures. The new set of conditions permitted the elusive synthesis of diethyl ether through reductive elimination, a remarkable feature currently beyond the scope of Ni.
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Affiliation(s)
- Franck Le Vaillant
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Edward J. Reijerse
- Max-Planck-Institut
für Chemische Energiekonversion, Stiftstrasse 34−36, Mülheim an der Ruhr 45470, Germany
| | - Markus Leutzsch
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
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Planas O, Peciukenas V, Cornella J. Bismuth-Catalyzed Oxidative Coupling of Arylboronic Acids with Triflate and Nonaflate Salts. J Am Chem Soc 2020; 142:11382-11387. [PMID: 32536157 PMCID: PMC7315642 DOI: 10.1021/jacs.0c05343] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
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Herein we present a Bi-catalyzed
cross-coupling of arylboronic
acids with perfluoroalkyl sulfonate salts based on a Bi(III)/Bi(V)
redox cycle. An electron-deficient sulfone ligand proved to be key
for the successful implementation of this protocol, which allows the
unusual construction of C(sp2)–O bonds using commercially
available NaOTf and KONf as coupling partners. Preliminary mechanistic
studies as well as theoretical investigations reveal the intermediacy
of a highly electrophilic Bi(V) species, which rapidly eliminates
phenyl triflate.
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Affiliation(s)
- Oriol Planas
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Vytautas Peciukenas
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
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García-Álvarez J. Special Issue: "Advances in Homogeneous Catalysis". Molecules 2020; 25:molecules25071493. [PMID: 32218341 PMCID: PMC7181144 DOI: 10.3390/molecules25071493] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 03/17/2020] [Indexed: 11/16/2022] Open
Abstract
The use of enzymes, organo-catalysts or transition metal catalysts, as opposed to the employment of stoichiometric quantities of other traditional promoters of different organic synthetic processes (like, inorganic/organic bases, Brønsted acids, radicals, etc.) has allowed the discovery of a great number of new synthetic protocols within the toolbox of organic chemists. Moreover, the employment of the aforementioned catalysts in organic synthesis permits: (i) the diminution of the global energy demand and production cost; (ii) the enhancement of both the chemoselectivity and stereoselectivity of the global process; and (iii) the reduction of metal-, organo- or bio-catalyst consumption, thanks to the possible recycling of the catalysts; all these being synthetic concepts closely related with the principles of so-called Green Chemistry. Thus, this Special Issue on “Advances in Homogenous Catalysis” has been aimed to showcase a series of stimulating contributions from international experts within different sub-areas of catalysis in organic synthesis (ranging from metal-, organo-, or bio-catalyzed organic reactions).
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Affiliation(s)
- Joaquín García-Álvarez
- Laboratorio de Compuestos Organometálicos y Catálisis (Unidad Asociada al CSIC), Departamento de Química Orgánica e Inorgánica, (IUQOEM), Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
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