1
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Behnia A, Fard MA, Blacquiere JM, Puddephatt RJ. Hydroxopalladium(IV) complexes prepared using oxygen or hydrogen peroxide as oxidants. Dalton Trans 2024; 53:10901-10911. [PMID: 38885094 DOI: 10.1039/d4dt01202j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
The cycloneophylpalladium(II) complexes [Pd(CH2CMe2C6H4)(κ2-N,N'-L)], 1 or 2, with L = RO(CH2)3N(CH2-2-C5H4N)2, with R = H or Me, respectively, react with either dioxygen or hydrogen peroxide in the presence of NH4[PF6] to give rare examples of the corresponding hydroxopalladium(IV) complexes [Pd(OH)(CH2CMe2C6H4)(κ3-N,N',N''-L)][PF6], 3 or 4. The complexes 3 and 4 are stable at room temperature and have been structurally characterized. On heating a solution of 3 or 4 in moist dimethylsulphoxide, selective reductive elimination with C(sp2)-O bond formation is observed, followed by hydrolysis, to give the corresponding pincer complex [Pd(OH)(κ3-N,N',N''-L)][PF6] and 2-t-butylphenol as major products. A more complex reaction occurs in chloroform solution. The mechanisms of reaction are discussed, supported by DFT calculations.
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Affiliation(s)
- Ava Behnia
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7.
| | - Mahmood A Fard
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7.
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2
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Li H, Zhang B, Feng R, Guo S. An N-heterocyclic carbene-based pincer system of palladium and its versatile reactivity under oxidizing conditions. Dalton Trans 2024. [PMID: 38912609 DOI: 10.1039/d4dt00980k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/25/2024]
Abstract
NHC-based pincers (NHC = N-heterocyclic carbene) have been broadly employed as supporting platforms, and their palladium complexes have found many synthetic applications. However, previous studies mainly focused on the NHC pincers of palladium featuring an oxidation number of +II. In contrast, oxidation of these well-defined Pd(II) species and the study of their fundamental high-valent Pd chemistry remain largely undeveloped. In addition, from a perspective of PdII/PdIV catalysis, the reactivity and degradation of NHC pincers in catalytically relevant reactions have not been well understood. In this work, a series of Pd(II) complexes supported by a well-known NHC^Aryl^NHC pincer platform have been prepared. Their reactivity towards various oxidizing reagents, including halogen surrogates, electrophilic fluorine reagents, and alkyl/aryl halides, has been examined. In some cases, ambient-characterizable high-valent Pd NHCs, which have been scarcely reported, were obtained. The carbenes incorporated into the pincer framework proved to be effective spectator donors. In contrast, the central aryl moiety exhibits versatile reactivity and collapse pathways, allowing it to function either as a spectator or a non-innocent actor.
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Affiliation(s)
- Haobin Li
- Department of Chemistry, Capital Normal University, Beijing 100048, China.
| | - Bo Zhang
- Department of Chemistry, Capital Normal University, Beijing 100048, China.
| | - Rui Feng
- Department of Chemistry, Capital Normal University, Beijing 100048, China.
| | - Shuai Guo
- Department of Chemistry, Capital Normal University, Beijing 100048, China.
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3
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Shigehiro Y, Miya K, Shibai R, Kataoka Y, Ura Y. Synthesis of Pd-NNP Phosphoryl Mononuclear and Phosphinous Acid-Phosphoryl-Bridged Dinuclear Complexes and Ambient Light-Promoted Oxygenation of Benzyl Ligands. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuma Shigehiro
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women’s University, Kitauoyanishi-machi, Nara 630-8506, Japan
| | - Karen Miya
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women’s University, Kitauoyanishi-machi, Nara 630-8506, Japan
| | - Risa Shibai
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women’s University, Kitauoyanishi-machi, Nara 630-8506, Japan
| | - Yasutaka Kataoka
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women’s University, Kitauoyanishi-machi, Nara 630-8506, Japan
| | - Yasuyuki Ura
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women’s University, Kitauoyanishi-machi, Nara 630-8506, Japan
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4
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Cha J, Lee E, Yandulov DV. Mechanistic Studies for Pd(II)(O 2) Reduction Generating Pd(0) and H 2O: Formation of Pd(OH) 2 as a Key Intermediate. Inorg Chem 2022; 61:14544-14552. [PMID: 36050901 DOI: 10.1021/acs.inorgchem.2c01139] [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
Molecular oxygen (O2) remains to be an ideal yet underutilized feedstock for the oxidative transformation of organic substrates and renewable energy systems such as fuel cells. Palladium (Pd) has shown particular promise in enabling these applications. The present study describes a Pd-mediated O2 reduction to water via C-H activation of 9,10-dihydroanthracene (DHA) by a Pd(II) η2-peroxo complex 1O2. The reaction yields stoichiometric anthracene and Pd(0) product 1 and is notable in two respects. First, plots of concentrations of the reaction participants over time have distinctly sigmoidal shapes, indicating that conversion accelerates over time and implying autocatalysis. Second, the reaction proceeds via a genuine monometallic Pd(II) dihydroxide 1(OH)2 directly observed to grow and decay as an intermediate. Confirming its role as an intermediate, the dihydroxide 1(OH)2 was found to mediate C-H oxidation of DHA on par in activity with the peroxo compound 1O2. Mechanistic studies with density functional theory (DFT) calculations suggested that both 1O2 and 1(OH)2 react with DHA by hydrogen atom transfer (HAT) and that autocatalysis in the 1O2 reaction results from oxidative addition of the initial Pd(II) complex 1O2 to the Pd(0) product 1. This reaction forms a transient bis(μ-oxo) Pd(II) dimer 1O21 that is more active in the HAT oxidation of DHA than the initial 1O2.
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Affiliation(s)
- Jeongmin Cha
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Eunsung Lee
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.,Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Dmitry V Yandulov
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States.,Department of Biology and Biotechnology, National Research University Higher School of Economics, Moscow 117418, Russia
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5
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Shi Q, Wei X, Raza A, Li G. Recent Advances in Aerobic Photo‐Oxidation of Methanol to Valuable Chemicals. ChemCatChem 2021. [DOI: 10.1002/cctc.202100104] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Quanquan Shi
- College of Science and College of Material Science and Art Design Inner Mongolia Agricultural University Hohhot 010018 P. R. China
| | - Xuejiao Wei
- School of Chemical Engineering and Materials Changzhou Institute of Technology Changzhou 213032 P. R. China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
| | - Ali Raza
- Solar Cell Applications Research Lab Department of Physics Government College University Lahore 54000 Punjab Pakistan
- Department of Physics University of Sialkot (USKT) 1-Km Main Daska Road, Sialkot 51311 Punjab Pakistan
| | - Gao Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
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6
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Kouno M, Kuwamura N, Konno T. Interconversion between square-planar palladium(ii) and octahedral palladium(iv) centres in a sulfur-bridged trinuclear structure. Chem Commun (Camb) 2021; 57:1336-1339. [DOI: 10.1039/d0cc07490j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Coordination of six thiolato groups from two RhIII metalloligands stabilizes an octahedral PdIV centre, which is interconvertible with a square-planar PdII centre retaining the RhPdRh trinuclear structure.
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Affiliation(s)
- Masahiro Kouno
- Department of Chemistry
- Graduate School of Science
- Osaka University
- Toyonaka
- Japan
| | - Naoto Kuwamura
- Department of Chemistry
- Graduate School of Science
- Osaka University
- Toyonaka
- Japan
| | - Takumi Konno
- Department of Chemistry
- Graduate School of Science
- Osaka University
- Toyonaka
- Japan
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7
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Oka S, Shigehiro Y, Kataoka Y, Ura Y. Secondary phosphine oxide-triggered selective oxygenation of a benzyl ligand on palladium. Chem Commun (Camb) 2020; 56:12977-12980. [PMID: 32996484 DOI: 10.1039/d0cc05572g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The oxygenation of a benzyl ligand in [PdBnCl(cod)] was dramatically accelerated by using secondary phosphine oxides (SPOs), selectively affording either BnOOH or BnOH, depending on the concentration of O2. The SPOs coordinate to palladium in the form of phosphinous acids, operating as Brønsted acids to facilitate further reaction with O2.
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Affiliation(s)
- Sayaka Oka
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan.
| | - Yuma Shigehiro
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan.
| | - Yasutaka Kataoka
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan.
| | - Yasuyuki Ura
- Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan.
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8
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Schultz JW, Rath NP, Mirica LM. Improved Oxidative C-C Bond Formation Reactivity of High-Valent Pd Complexes Supported by a Pseudo-Tridentate Ligand. Inorg Chem 2020; 59:11782-11792. [PMID: 32799488 DOI: 10.1021/acs.inorgchem.0c01763] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
There is a large interest in developing oxidative transformations catalyzed by palladium complexes that employ environmentally friendly and economical oxidizing reagents such as dioxygen. Recently, we have reported the isolation and characterization of various mononuclear PdIII and PdIV complexes supported by the tetradentate ligands N,N'-dialkyl-2,11-diaza[3.3](2,6)pyridinophane (RN4, R = tBu, iPr, Me), and the aerobically induced C-C and C-heteroatom bond formation reactivity was investigated in detail. Given that the steric and electronic properties of the multidentate ligands were shown to tune the stability and reactivity of the corresponding high-valent Pd complexes, herein we report the use of an asymmetric N4 ligand, N-mehtyl-N'-tosyl-2,11-diaza[3.3](2,6)pyridinophane (TsMeN4), in which one amine N atom contains a tosyl group. The N-Ts donor atom exhibits a markedly reduced donating ability, which led to the formation of transiently stable PdIII and PdIV complexes, and consequently the corresponding O2 oxidation reactivity and the subsequent C-C bond formation were improved significantly.
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Affiliation(s)
- Jason W Schultz
- Department of Chemistry, Washington University, St. Louis, Missouri 63130, United States
| | - Nigam P Rath
- Department of Chemistry and Biochemistry, One University Boulevard, University of Missouri, St. Louis, Missouri 63121, United States
| | - Liviu M Mirica
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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9
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Zhang B, Yan X, Guo S. Synthesis of Well-Defined High-Valent Palladium Complexes by Oxidation of Their Palladium(II) Precursors. Chemistry 2020; 26:9430-9444. [PMID: 32227537 DOI: 10.1002/chem.202001074] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 03/27/2020] [Indexed: 12/24/2022]
Abstract
The last decade has witnessed the rapid development of high-valent Pd-involved organic transformations. This has also led to a steadily growing number of publications concerning the preparation of isolable and characterizable palladium(III) and palladium(IV) complexes. A variety of one-electron and two-electron oxidants have been employed to give access to high-oxidation-state Pd compounds. Undoubtedly, the study of these stoichiometric reactions has great implications for relevant Pd-mediated catalysis. In this minireview, the focus is on the synthetic approaches to structurally determined PdIII/IV complexes starting from their PdII precursors, and the advances in this research area from early 2010 to late 2019 will be highlighted. Chemical oxidations exploiting various oxidizing agents including 1) hypervalent iodine reagents; 2) halogens; 3) electrophilic fluorination reagents; 4) alkyl/aryl halides; 5) ferrocenium salts; 6) peroxides/O2 ; 7) sulfonyl chlorides; and 8) others are covered. A "greener" electrooxidation manner has also been reviewed.
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Affiliation(s)
- Bo Zhang
- Department of Chemistry, Capital Normal University, Beijing, 100048, P.R. China
| | - Xuechao Yan
- Department of Chemistry, Capital Normal University, Beijing, 100048, P.R. China
| | - Shuai Guo
- Department of Chemistry, Capital Normal University, Beijing, 100048, P.R. China
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10
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Jones MR, Fast CD, Schley ND. Iridium-Catalyzed sp 3 C-H Borylation in Hydrocarbon Solvent Enabled by 2,2'-Dipyridylarylmethane Ligands. J Am Chem Soc 2020; 142:6488-6492. [PMID: 32202100 DOI: 10.1021/jacs.0c00524] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Iridium-catalyzed alkane C-H borylation has long suffered from poor atom economy, resulting from both the inclusion of only 1 equiv of boron from the diboron reagent and a requirement for neat substrate. An appropriately substituted dipyridylarylmethane ligand was found to give highly active alkane borylation catalysts that facilitate C-H borylation with improved efficiency. This system provides for complete consumption of the diboron reagent, producing 2 molar equivalents of product at low catalyst loadings. The superior efficacy of this system also enables borylation of unactivated alkanes in hydrocarbon solvent with a reduced excess of substrate and improved functional group compatibility. The effectiveness of this ligand is displayed across a selection of functional groups, both under traditional borylation conditions in neat substrate and under atypical conditions in cyclohexane solvent. The utility of this catalytic system is exemplified by the borylation of substrates containing polar functionality, which are unreactive toward C-H borylation under neat conditions.
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Affiliation(s)
- Margaret R Jones
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 27235, United States
| | - Caleb D Fast
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 27235, United States
| | - Nathan D Schley
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 27235, United States
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11
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Jackman KMK, Bridge BJ, Sauvé ER, Rowley CN, Zheng CHM, Stubbs JM, Boyle PD, Blacquiere JM. C(sp 3)–C(sp 3) Coupling with a Pd(II) Complex Bearing a Structurally Responsive Ligand. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Kyle M. K. Jackman
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | - Benjamin J. Bridge
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | - Ethan R. Sauvé
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | - Christopher N. Rowley
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, Canada A1B 3X7
| | - Cameron H. M. Zheng
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | - James M. Stubbs
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | - Paul D. Boyle
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
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12
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Ura Y. Toward the Development of Palladium-catalyzed Terminal-selective Oxidations of Hydrocarbons Using Molecular Oxygen. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.1291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Rudenko AE, Clayman NE, Walker KL, Maclaren JK, Zimmerman PM, Waymouth RM. Ligand-Induced Reductive Elimination of Ethane from Azopyridine Palladium Dimethyl Complexes. J Am Chem Soc 2018; 140:11408-11415. [PMID: 30160962 DOI: 10.1021/jacs.8b06398] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Reductive elimination (RE) is a critical step in many catalytic processes. The reductive elimination of unsaturated groups (aryl, vinyl and ethynyl) from Pd(II) species is considerably faster than RE of saturated alkyl groups. Pd(II) dimethyl complexes ligated by chelating diimine ligands are stable toward RE unless subjected to a thermal or redox stimulus. Herein, we report the spontaneous RE of ethane from (azpy)PdMe2 complexes and the unique role of the redox-active azopyridine (azpy) ligands in facilitating this reaction. The (azpy)PdMe2 complexes are air- and moisture-stable in the solid form, but they readily produce ethane upon dissolution in polar solvents at temperatures from 10 °C to room temperature without the need for an external oxidant or elevated temperatures. Experimental and computational studies indicate that a bimolecular methyl transfer precedes the reductive elimination step, where both steps are facilitated by the redox-active azopyridine ligand.
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Affiliation(s)
- Andrey E Rudenko
- Department of Chemistry , Stanford University , Stanford , California 94305-5080 , United States
| | - Naomi E Clayman
- Department of Chemistry , Stanford University , Stanford , California 94305-5080 , United States
| | - Katherine L Walker
- Department of Chemistry , Stanford University , Stanford , California 94305-5080 , United States
| | - Jana K Maclaren
- Stanford Nano Shared Facilities , Stanford University , 476 Lomita Mall , Stanford , California 94305 , United States
| | - Paul M Zimmerman
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109-1055 , United States
| | - Robert M Waymouth
- Department of Chemistry , Stanford University , Stanford , California 94305-5080 , United States
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14
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Peng Q, Wang Z, Zarić SD, Brothers EN, Hall MB. Unraveling the Role of a Flexible Tetradentate Ligand in the Aerobic Oxidative Carbon-Carbon Bond Formation with Palladium Complexes: A Computational Mechanistic Study. J Am Chem Soc 2018; 140:3929-3939. [PMID: 29444572 DOI: 10.1021/jacs.7b11701] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mechanistic details of the aerobic oxidative coupling of methyl groups by a novel (MeL)PdII(Me)2 complex with the tetradentate ligand, MeL = N, N-dimethyl-2,11-diaza[3.3](2,6)pyridinophane, has been explored by density functional theory calculations. The calculated mechanism sheds light on the role of this ligand's flexibility in several stages of the reaction, especially as the oxidation state of the Pd changes. Ligand flexibility leads to diverse axial coordination modes, and it controls the availability of electrons by modulating the energies of high-lying molecular orbitals, particularly those with major d z2 character. Solvent molecules, particularly water, appear essential in the aerobic oxidation of PdII by lowering the energy of the oxygen molecule's unoccupied molecular orbital and stabilizing the PdX-O2 complex. Ligand flexibility and solvent coordination to oxygen are essential to the required spin-crossover for the transformation of high-valent PdX-O2 complexes. A methyl cation pathway has been predicted by our calculations in transmetalation between PdII and PdIV intermediates to be preferred over methyl radical or methyl anion pathways. Combining an axial and equatorial methyl group is preferred in the reductive elimination pathway where roles are played by the ligand's flexibility and the fluxionality of trimethyl groups.
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Affiliation(s)
- Qian Peng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Zengwei Wang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Snežana D Zarić
- Faculty of Chemistry , Texas A&M University at Qatar , P.O. Box 23874, Doha , Qatar.,Department of Chemistry , University of Belgrade , Studentski trg 12-16 , Belgrade , Serbia
| | - Edward N Brothers
- Faculty of Chemistry , Texas A&M University at Qatar , P.O. Box 23874, Doha , Qatar
| | - Michael B Hall
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
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15
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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: 122] [Impact Index Per Article: 20.3] [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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16
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Canty AJ, Ariafard A, Camasso NM, Higgs AT, Yates BF, Sanford MS. Computational study of C(sp 3)-O bond formation at a Pd IV centre. Dalton Trans 2018; 46:3742-3748. [PMID: 28262888 DOI: 10.1039/c7dt00096k] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
This report describes a computational study of C(sp3)-OR bond formation from PdIV complexes of general structure PdIV(CH2CMe2-o-C6H4-C,C')(F)(OR)(bpy-N,N') (bpy = 2,2'-bipyridine). Dissociation of -OR from the different octahedral PdIV starting materials results in a common square-pyramidal PdIV cation. An SN2-type attack by -OR (-OR = phenoxide, acetate, difluoroacetate, and nitrate) then leads to C(sp3)-OR bond formation. In contrast, when -OR = triflate, concerted C(sp3)-C(sp2) bond-forming reductive elimination takes place, and the calculations indicate this outcome is the result of thermodynamic rather than kinetic control. The energy requirements for the dissociation and SN2 steps with different -OR follow opposing trends. The SN2 transition states exhibit "PdCO" angles in a tight range of 151.5 to 153.0°, resulting from steric interactions between the oxygen atom and the gem-dimethyl group of the ligand. Conformational effects for various OR ligands and isomerisation of the complexes were also examined as components of the solution dynamics in these systems. In all cases, the trends observed computationally agree with those observed experimentally.
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Affiliation(s)
- Allan J Canty
- School of Physical Sciences, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia.
| | - Alireza Ariafard
- School of Physical Sciences, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia.
| | - Nicole M Camasso
- Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109, USA.
| | - Andrew T Higgs
- Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109, USA.
| | - Brian F Yates
- School of Physical Sciences, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia.
| | - Melanie S Sanford
- Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109, USA.
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17
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Nelson DJ, Nolan SP. Hydroxide complexes of the late transition metals: Organometallic chemistry and catalysis. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.10.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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18
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Behnia A, Fard MA, Blacquiere JM, Puddephatt RJ. Reactivity of a Palladacyclic Complex: A Monodentate Carbonate Complex and the Remarkable Selectivity and Mechanism of a Neophyl Rearrangement. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00631] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ava Behnia
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Mahmood A. Fard
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Johanna M. Blacquiere
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Richard J. Puddephatt
- Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
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19
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Pichaandi KR, Kabalan L, Amini H, Zhang G, Zhu H, Kenttämaa HI, Fanwick PE, Miller JT, Kais S, Nabavizadeh SM, Rashdi M, Abu-Omar MM. Mechanism of Me-Re Bond Addition to Platinum(II) and Dioxygen Activation by the Resulting Pt-Re Bimetallic Center. Inorg Chem 2017; 56:2145-2152. [PMID: 28165752 DOI: 10.1021/acs.inorgchem.6b02801] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Unusual cis-oxidative addition of methyltrioxorhenium (MTO) to [PtMe2(bpy)], (bpy = 2,2'-bipyridine) (1) is described. Addition of MTO to 1 first gives the Lewis acid-base adduct [(bpy)Me2Pt-Re(Me)(O)3] (2) and subsequently affords the oxidative addition product [(bpy)Me3PtReO3] (3). All complexes 1, MTO, 2, and 3 are in equilibrium in solution. The structure of 2 was confirmed by X-ray crystallography, and its dissociation constant in solution is 0.87 M. The structure of 3 was confirmed by extended X-ray absorption fine structure and X-ray absorption near-edge structure in tandem with one- and two-dimensional NMR spectroscopy augmented by deuterium and 13C isotope-labeling studies. Kinetics of formation of compound 3 revealed saturation kinetics dependence on [MTO] and first-order in [Pt], complying with prior equilibrium formation of 2 with oxidative addition of Me-Re being the rate-determining step. Exposure of 3 to molecular oxygen or air resulted in the insertion of an oxygen atom into the platinum-rhenium bond forming [(bpy)Me3PtOReO3] (4) as final product. Density functional theory analysis on oxygen insertion pathways leading to complex 4, merited on the basis of Russell oxidation pathway, revealed the involvement of rhenium peroxo species.
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Affiliation(s)
- Kothanda Rama Pichaandi
- Brown Laboratory, Department of Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Lara Kabalan
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation , Doha, Qatar
| | - Hashem Amini
- Department of Chemistry, College of Sciences, Shiraz University , Shiraz, 71467-13565 Iran
| | - Guanghui Zhang
- School of Chemical Engineering, Purdue University , Forney Hall of Chemical Engineering, 480 Stadium Drive, West Lafayette, Indiana 47907, United States
| | - Hanyu Zhu
- Brown Laboratory, Department of Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Hilkka I Kenttämaa
- Brown Laboratory, Department of Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Phillip E Fanwick
- Brown Laboratory, Department of Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Jeffrey T Miller
- School of Chemical Engineering, Purdue University , Forney Hall of Chemical Engineering, 480 Stadium Drive, West Lafayette, Indiana 47907, United States
| | - Sabre Kais
- Brown Laboratory, Department of Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States.,Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation , Doha, Qatar
| | - S Masoud Nabavizadeh
- Department of Chemistry, College of Sciences, Shiraz University , Shiraz, 71467-13565 Iran
| | - Mehdi Rashdi
- Department of Chemistry, College of Sciences, Shiraz University , Shiraz, 71467-13565 Iran
| | - Mahdi M Abu-Omar
- Brown Laboratory, Department of Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States.,School of Chemical Engineering, Purdue University , Forney Hall of Chemical Engineering, 480 Stadium Drive, West Lafayette, Indiana 47907, United States
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Xu YL, Teng QH, Tong W, Wang HS, Pan YM, Ma XL. Atom-Economic Synthesis of 4-Pyrones from Diynones and Water. Molecules 2017; 22:E109. [PMID: 28075414 PMCID: PMC6155647 DOI: 10.3390/molecules22010109] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/05/2017] [Accepted: 01/05/2017] [Indexed: 12/31/2022] Open
Abstract
Transition-metal-free synthesis of 4-pyrones via TfOH-promoted nucleophilic addition/cyclization of diynones and water has been developed. This transformation is simple, atom economical and environmentally benign, providing rapid and efficient access to substituted 4-pyrones.
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Affiliation(s)
- Yan-Li Xu
- College of Pharmacy, Guilin Medical University, Guilin 541004, China.
| | - Qing-Hu Teng
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Wei Tong
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Heng-Shan Wang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Ying-Ming Pan
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Xian-Li Ma
- College of Pharmacy, Guilin Medical University, Guilin 541004, China.
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21
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Activation and selective oxy-functionalization of alkanes with metal complexes: Shilov reaction and some new aspects. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.molcata.2016.08.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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22
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Sberegaeva AV, Watts D, Vedernikov AN. Oxidative Functionalization of Late Transition Metal–Carbon Bonds. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2017. [DOI: 10.1016/bs.adomc.2017.03.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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23
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Lyu H, Quan Y, Xie Z. Rhodium-Catalyzed Regioselective Hydroxylation of Cage B−H Bonds ofo-Carboranes with O2or Air. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605880] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hairong Lyu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong; Shatin, N.T. Hong Kong China
| | - Yangjian Quan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong; Shatin, N.T. Hong Kong China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong; Shatin, N.T. Hong Kong China
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24
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Lyu H, Quan Y, Xie Z. Rhodium-Catalyzed Regioselective Hydroxylation of Cage B−H Bonds ofo-Carboranes with O2or Air. Angew Chem Int Ed Engl 2016; 55:11840-4. [DOI: 10.1002/anie.201605880] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 08/08/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Hairong Lyu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong; Shatin, N.T. Hong Kong China
| | - Yangjian Quan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong; Shatin, N.T. Hong Kong China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong; Shatin, N.T. Hong Kong China
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25
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Behnia A, Boyle PD, Blacquiere JM, Puddephatt RJ. Selective Oxygen Atom Insertion into an Aryl–Palladium Bond. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00387] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ava Behnia
- Department of Chemistry, University of Western Ontario, London, Canada N6A
5B7
| | - Paul D. Boyle
- Department of Chemistry, University of Western Ontario, London, Canada N6A
5B7
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