1
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Elsberg JGD, Borowski T, Reinheimer EW, Berreau LM. Anion- and Water-facilitated Oxidative Carbon-Carbon Bond Cleavage and Diketonate Carboxylation in Cu(II) Chlorodiketonate Complexes. Inorganica Chim Acta 2024; 571:122203. [PMID: 39399531 PMCID: PMC11465868 DOI: 10.1016/j.ica.2024.122203] [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] [Indexed: 10/15/2024]
Abstract
The O2-dependent carbon-carbon (C-C) bond cleavage reactions of the mononuclear Cu(II) chlorodiketonate complexes [(6-Ph2TPA)Cu(PhC(O)CClC(O)Ph)]ClO4 (1-ClO 4 ) and [(bpy)Cu(PhC(O)CClC(O)Ph)(ClO4)] (3-ClO 4 ) have been further examined in terms of their anion and water dependence. The bpy-ligated Cu(II) chlorodiketonate complex 3-ClO 4 is inherently more reactive with O2 than the 6-Ph2TPA-ligated analog 1-ClO 4 . Added chloride is needed to facilitate O2 reactivity for 1-ClO 4 but not for 3-ClO 4 at 25(1) °C. Evaluation of k obs for the reaction of 1-ClO 4 with O2 under pseudo first-order conditions as a function of the amount of added chloride ion produced saturation type behavior. The bpy-ligated 3-ClO 4 exhibits different behavior, with rate enhancement resulting from both the addition of chloride ion and water. Computational studies indicate that the presence of water lowers the barrier for O2 activation for 3-ClO 4 by ~12 kcal/mol whereas changing the anion from perchlorate to chloride has a smaller effect (lowering of the barrier by ~3 kcal/mol). Notably, the effect of water for 3-ClO 4 is of similar magnitude to the barrier-lowering chloride effect found in the O2 activation pathway for 1-ClO 4 . Thus, both systems involve lower energy O2 activation pathways available, albeit resulting from different ligand effects. Probing the effect of added benzoate anion, it was found that the chloro substituent in the diketonate moiety of 1-ClO 4 and 3-ClO 4 will undergo displacement upon treatment of each complex with tetrabutyl ammonium benzoate to give Cu(II) benzoyloxydiketonate complexes (4 and 5). Complexes 4 and 5 exhibit slow O2-dependent C-C cleavage in the presence of added chloride ion. These results are discussed in the context of the chemistry identified for various divalent metal chlorodiketonate complexes, which have relevance to catalytic systems and metalloenzymes that mediate O2-dependent C-C cleavage within diketonate substrates.
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Affiliation(s)
- Josiah G. D. Elsberg
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300
| | - Tomasz Borowski
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow 30-239, Poland
| | - Eric W. Reinheimer
- Rigaku Americas Corporation, 9009 New Trails Drive, The Woodlands, TX 77381 USA
| | - Lisa M. Berreau
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300
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2
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Anderson SN, Elsberg JGD, Berreau LM. Light-induced O 2-dependent aliphatic carbon-carbon (C-C) bond cleavage in bipyridine-ligated Co(II) chlorodiketonate complexes. Dalton Trans 2023; 52:4152-4160. [PMID: 36891768 PMCID: PMC10426287 DOI: 10.1039/d2dt03727k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
Mononuclear bipyridine (bpy)-ligated Co(II) chlorodiketonate complexes [(bpy)2Co(R-PhC(O)C(Cl)C(O)R-Ph)]ClO4 (R = -H (8), -CH3 (9), and -OCH3 (10)), were prepared, characterized and investigated for O2-dependent aliphatic C-C bond cleavage reactivity. Complexes 8-10 have a distorted psuedo-octahedral geometry. 1H NMR spectra of 8-10 in CD3CN show signals for the coordinated diketonate moiety, and signals suggesting ligand exchange reactivity leading to the formation of a small amount of [(bpy)3Co](ClO4)2 (11) in solution. While 8-10 are air stable at room temperature, illumination at 350 nm results in oxidative cleavage reactivity within the diketonate moiety leading to the formation of 1,3-diphenylpropanetrione, benzoic acid, benzoic anhydride, and benzil. Illumination of 8 under 18O2 results in a high level of 18O incorporation (>80%) in the benzoate anion. The product mixture, high level of 18O incorporation, and additional mechanistic studies suggest a reaction sequence wherein light-induced reactivity leads to the formation of a triketone intermediate that undergoes either oxidative C-C bond cleavage or benzoyl migration promoted by a bipyridine-ligated Co(II) or Co(III) fragment.
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Affiliation(s)
- Stephen N Anderson
- Department of Chemistry & Biochemistry, Utah State University, Logan, UT 84322-0300, USA.
| | - Josiah G D Elsberg
- Department of Chemistry & Biochemistry, Utah State University, Logan, UT 84322-0300, USA.
| | - Lisa M Berreau
- Department of Chemistry & Biochemistry, Utah State University, Logan, UT 84322-0300, USA.
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3
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Xi Z, Liu Y, Wang H, Guan D, Liu Y, Sun B, Tian H, Liang S. A Convenient Method for α‐Chlorination of 1,3‐Diketones and β‐Keto Esters with DMSO or Ph
2
SO/(COCl)
2. ChemistrySelect 2021. [DOI: 10.1002/slct.202102985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Zeyu Xi
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Yuanjian Liu
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Hao Wang
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Di Guan
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Yongguo Liu
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Baoguo Sun
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Hongyu Tian
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
| | - Sen Liang
- Department Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Key Laboratory of Flavor Chemistry Institution Beijing Technology and Business University Fucheng Road 11#, Haidian District Beijing China 100048
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4
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Meng L, Li W, Guo P, Wang S, Tong X. A novel selective oxidative cleavage of C C bond mediated by black nickel oxide in the presence of molecular oxygen. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2021.106305] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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5
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Elsberg JGD, Peterson A, Fuller AL, Berreau LM. N 3-Ligated nickel(ii) diketonate complexes: synthesis, characterization and evaluation of O 2 reactivity. Dalton Trans 2020; 49:7564-7575. [PMID: 32458917 PMCID: PMC7744241 DOI: 10.1039/d0dt01338b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Interest in O2-dependent aliphatic carbon-carbon (C-C) bond cleavage reactions of first row divalent metal diketonate complexes stems from the desire to further understand the reaction pathways of enzymes such as DKE1 and to extract information to develop applications in organic synthesis. A recent report of O2-dependent aliphatic C-C bond cleavage at ambient temperature in Ni(ii) diketonate complexes supported by a tridentate nitrogen donor ligand [(MBBP)Ni(PhC(O)CHC(O)Ph)]Cl (7-Cl; MBBP = 2,6-bis(1-methylbenzimidazol-2-yl)pyridine) in the presence of NEt3 spurred our interest in further examining the chemistry of such complexes. A series of new TERPY-ligated Ni(ii) diketonate complexes of the general formula [(TERPY)Ni(R2-1,3-diketonate)]ClO4 (1: R = CH3; 2: R = C(CH3)3; 3: R = Ph) was prepared under air and characterized using single crystal X-ray crystallography, elemental analysis, 1H NMR, ESI-MS, FTIR, and UV-vis. Analysis of the reaction mixtures in which these complexes were generated using 1H NMR and ESI-MS revealed the presence of both the desired diketonate complex and the bis-TERPY derivative [(TERPY)2Ni](ClO4)2 (4). Through selective crystallization 1-3 were isolated in analytically pure form. Analysis of reaction mixtures leading to the formation of the MBBP analogs [(MBBP)Ni(R2-1,3-diketonate)]X (X = ClO4: 5: R = CH3; 6: R = C(CH3)3; 7-ClO4: R = Ph; X = Cl: 7-Cl: R = Ph) using 1H NMR and ESI-MS revealed the presence of [(MBBP)2Ni](ClO4)2 (8). Analysis of aerobic acetonitrile solutions of analytically pure 1-3, 5 and 6 containing NEt3 and in some cases H2O using 1H NMR and UV-vis revealed evidence for the formation of additional bis-ligand complexes (4 and 8) but suggested no oxidative diketonate cleavage reactivity. Analysis of the organic products generated from 3, 7-ClO4 and 7-Cl revealed unaltered dibenzoylmethane. Our results therefore indicate that N3-ligated Ni(ii) complexes of unsubstituted diketonate ligands do not exhibit O2-dependent aliphatic C-C bond clevage at room temperature, including in the presence of NEt3 and/or H2O.
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Affiliation(s)
- Josiah G D Elsberg
- Department of Chemistry & Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA.
| | - Austin Peterson
- Department of Chemistry & Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA.
| | - Amy L Fuller
- Department of Chemistry, University of Hawaii Manoa, 2545 McCarthy Mall, Honolulu, HI 96822-2275, USA
| | - Lisa M Berreau
- Department of Chemistry & Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322-0300, USA.
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6
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Raje S, Mani K, Kandasamy P, Butcher RJ, Angamuthu R. Bioinspired Oxidative Cleavage of Aliphatic C–C Bonds Utilizing Aerial Oxygen by Nickel Acireductone Dioxygenase Mimics. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sakthi Raje
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Kalaikodikumaran Mani
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Parameswaran Kandasamy
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Ray J. Butcher
- Department of Chemistry Howard University 20059 Washington, D.C. United States
| | - Raja Angamuthu
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
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7
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Hoof S, Sallmann M, Herwig C, Braun-Cula B, Limberg C. O 2 activation at a trispyrazolylborato nickel(ii) malonato complex. Dalton Trans 2017; 46:16792-16795. [PMID: 29177352 DOI: 10.1039/c7dt04056c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To support mechanistic inferences made for an iron-based dioxygenase model, a nickel analogue, i.e. a TpNi-malonate (1) was prepared. 1 proved to represent a rare case of a nickel complex reacting with O2 in a controlled manner - mechanistically different from the iron case - and leads to hydroxylation of the malonate.
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Affiliation(s)
- S Hoof
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - M Sallmann
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - C Herwig
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - B Braun-Cula
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - C Limberg
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
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8
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Holze P, Corona T, Frank N, Braun-Cula B, Herwig C, Company A, Limberg C. Activation of Dioxygen at a Lewis Acidic Nickel(II) Complex: Characterization of a Metastable Organoperoxide Complex. Angew Chem Int Ed Engl 2017; 56:2307-2311. [PMID: 28111896 DOI: 10.1002/anie.201609526] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 10/31/2016] [Indexed: 11/05/2022]
Abstract
In metal-mediated O2 activation, nickel(II) compounds hardly play a role, but recently it has been shown that enzymes can use nickel(II) for O2 activation. Now a low-coordinate Lewis acidic nickel(II) complex has been synthesized that reacts with O2 to give a nickel(II) organoperoxide, as proposed for the enzymatic system. Its formation was studied further by UV/Vis absorption spectroscopy, leading to the observation of a short-lived intermediate that proved to be reactive in both oxygen atom transfer and hydrogen abstraction reactions, while the peroxide efficiently transfers O atoms. Both for the enzyme and for the functional model, the key to O2 activation is proposed to represent a concomitant electron shift from the substrate/co-ligand.
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Affiliation(s)
- Patrick Holze
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Teresa Corona
- Grup de Química Bioinspirada, Supramolecular i Catàlisi (QBIS-CAT), Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Universitat de Girona, 17003, Girona, Catalonia, Spain
| | - Nicolas Frank
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Beatrice Braun-Cula
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Christian Herwig
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Anna Company
- Grup de Química Bioinspirada, Supramolecular i Catàlisi (QBIS-CAT), Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Universitat de Girona, 17003, Girona, Catalonia, Spain
| | - Christian Limberg
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
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9
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Holze P, Corona T, Frank N, Braun-Cula B, Herwig C, Company A, Limberg C. Activation of Dioxygen at a Lewis Acidic Nickel(II) Complex: Characterization of a Metastable Organoperoxide Complex. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201609526] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Patrick Holze
- Humboldt-Universität zu Berlin; Institut für Chemie; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Teresa Corona
- Grup de Química Bioinspirada; Supramolecular i Catàlisi (QBIS-CAT); Institut de Química Computacional i Catàlisi (IQCC); Departament de Química; Universitat de Girona; 17003 Girona Catalonia Spain
| | - Nicolas Frank
- Humboldt-Universität zu Berlin; Institut für Chemie; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Beatrice Braun-Cula
- Humboldt-Universität zu Berlin; Institut für Chemie; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Christian Herwig
- Humboldt-Universität zu Berlin; Institut für Chemie; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Anna Company
- Grup de Química Bioinspirada; Supramolecular i Catàlisi (QBIS-CAT); Institut de Química Computacional i Catàlisi (IQCC); Departament de Química; Universitat de Girona; 17003 Girona Catalonia Spain
| | - Christian Limberg
- Humboldt-Universität zu Berlin; Institut für Chemie; Brook-Taylor-Strasse 2 12489 Berlin Germany
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10
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Saraf SL, Miłaczewska A, Borowski T, James CD, Tierney DL, Popova M, Arif AM, Berreau LM. Anion Effects in Oxidative Aliphatic Carbon-Carbon Bond Cleavage Reactions of Cu(II) Chlorodiketonate Complexes. Inorg Chem 2016; 55:6916-28. [PMID: 27377103 DOI: 10.1021/acs.inorgchem.6b00456] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Aliphatic oxidative carbon-carbon bond cleavage reactions involving Cu(II) catalysts and O2 as the terminal oxidant are of significant current interest. However, little is currently known regarding how the nature of the Cu(II) catalyst, including the anions present, influence the reaction with O2. In previous work, we found that exposure of the Cu(II) chlorodiketonate complex [(6-Ph2TPA)Cu(PhC(O)CClC(O)Ph)]ClO4 (1) to O2 results in oxidative aliphatic carbon-carbon bond cleavage within the diketonate unit, leading to the formation of benzoic acid, benzoic anhydride, benzil, and 1,3-diphenylpropanedione as organic products. Kinetic studies of this reaction revealed a slow induction phase followed by a rapid decay of the absorption features of 1. Notably, the induction phase is not present when the reaction is performed in the presence of a catalytic amount of chloride anion. In the studies presented herein, a combination of spectroscopic (UV-vis, EPR) and density functional theory (DFT) methods have been used to examine the chloride and benzoate ion binding properties of 1 under anaerobic conditions. These studies provide evidence that each anion coordinates in an axial position of the Cu(II) center. DFT studies reveal that the presence of the anion in the Cu(II) coordination sphere decreases the barrier for O2 activation and the formation of a Cu(II)-peroxo species. Notably, the chloride anion more effectively lowers the barrier associated with O-O bond cleavage. Thus, the nature of the anion plays an important role in determining the rate of reaction of the diketonate complex with O2. The same type of anion effects were observed in the O2 reactivity of the simple Cu(II)-bipyridine complex [(bpy)Cu(PhC(O)C(Cl)C(O)Ph)ClO4] (3).
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Affiliation(s)
- Sushma L Saraf
- Department of Chemistry & Biochemistry, Utah State University , Logan, Utah 84322-0300, United States
| | - Anna Miłaczewska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science , Krakow 30-239, Poland
| | - Tomasz Borowski
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science , Krakow 30-239, Poland
| | - Christopher D James
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - David L Tierney
- Department of Chemistry and Biochemistry, Miami University , Oxford, Ohio 45056, United States
| | - Marina Popova
- Department of Chemistry & Biochemistry, Utah State University , Logan, Utah 84322-0300, United States
| | - Atta M Arif
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112-0850, United States
| | - Lisa M Berreau
- Department of Chemistry & Biochemistry, Utah State University , Logan, Utah 84322-0300, United States
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11
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Allpress CJ, Berreau LM. A Nickel‐Containing Model System of Acireductone Dioxygenases that Utilizes a C(1)‐H Acireductone Substrate. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402254] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Caleb J. Allpress
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322‐0300, USA, http://lisaberreau.org/
| | - Lisa M. Berreau
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT 84322‐0300, USA, http://lisaberreau.org/
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12
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Allpress CJ, Miłaczewska A, Borowski T, Bennett JR, Tierney DL, Arif AM, Berreau LM. Halide-Promoted Dioxygenolysis of a Carbon–Carbon Bond by a Copper(II) Diketonate Complex. J Am Chem Soc 2014; 136:7821-4. [DOI: 10.1021/ja502577b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Caleb J. Allpress
- Department of Chemistry & Biochemistry, Utah State University, Logan, Utah 84322-0300, United States
| | - Anna Miłaczewska
- Jerzy
Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Krakow 30-239, Poland
| | - Tomasz Borowski
- Jerzy
Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Krakow 30-239, Poland
| | - Jami R. Bennett
- Department
of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - David L. Tierney
- Department
of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - Atta M. Arif
- Department
of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, United States
| | - Lisa M. Berreau
- Department of Chemistry & Biochemistry, Utah State University, Logan, Utah 84322-0300, United States
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13
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Kopylovich MN, Mahmudov KT, Haukka M, Pombeiro AJL. Metal-free regioselective C–C bond cleavage in 1,3,5-triazine derivatives of β-diketones. NEW J CHEM 2014. [DOI: 10.1039/c3nj01292a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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15
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Regioselective CC bond cleavage in arylhydrazones of 4,4,4-trifluoro-1-(thiophen-2-yl)butane-1,3-diones. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.07.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Ye J, Zhang X, Deng D, Ning G, Liu T, Zhuang M, Yang L, Gong W, Lin Y. Selective C–C bond cleavage of cyclopentadiene rings assisted by ferric chloride to synthesize water-soluble pyrylium salts. RSC Adv 2013. [DOI: 10.1039/c3ra41274a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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