1
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Rettig ID, Xu J, Knight EA, Truong PT, Bowring MA. Variable Kinetic Isotope Effect Reveals a Multistep Pathway for Protonolysis of a Pt–Me Bond. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Irving D. Rettig
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
| | - Jingtong Xu
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
| | | | - Phan T. Truong
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
| | - Miriam A. Bowring
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
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2
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Ho SKY, Lam FYT, de Aguirre A, Maseras F, White AJP, Britovsek GJP. Photolytic Activation of Late-Transition-Metal–Carbon Bonds and Their Reactivity toward Oxygen. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sarah K. Y. Ho
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - Francis Y. T. Lam
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - Adiran de Aguirre
- Institute of Chemical Research of Catalonia, The Barcelona Institute for Science and Technology, Avgda. Països Catalans, 16, Tarragona 43007, Catalonia, Spain
| | - Feliu Maseras
- Institute of Chemical Research of Catalonia, The Barcelona Institute for Science and Technology, Avgda. Països Catalans, 16, Tarragona 43007, Catalonia, Spain
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - George J. P. Britovsek
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
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3
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Liang LC, Liao SM, Zou XR. Facial-Meridional Isomerization and Reductive Elimination in [(R 2P- o-C 6H 4) 2N]PtMe 3 (R = Ph, iPr). Inorg Chem 2021; 60:15118-15123. [PMID: 34597032 DOI: 10.1021/acs.inorgchem.1c02494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Treatment of PtMe3I in tetrahydrofuran with either in situ prepared [R-PNP]Li ([R-PNP]- = [(R2P-o-C6H4)2N]-; R = Ph, iPr) or H[R-PNP] in the presence of triethylamine at room temperature affords quantitatively fac-[R-PNP]PtMe3. Thermolysis of fac-[R-PNP]PtMe3 in benzene solutions generates mer-[R-PNP]PtMe3 and ultimately [R-PNP]PtMe and ethane. Complexes mer-[R-PNP]PtMe3 represent the first meridional trialkylplatinum(IV) derivatives to date.
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Affiliation(s)
- Lan-Chang Liang
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.,Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.,School of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Shu-Mei Liao
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Xue-Ru Zou
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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4
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Barham A, Neu J, Canter CL, Pike RD, Li Y, Huo S. Isomerization-Induced Multiple Reaction Pathways in Platinum-Catalyzed C–H Acylation Reaction of 2-Aryloxypyridines. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexander Barham
- Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, United States
| | - Justin Neu
- Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, United States
| | - Cathleen L. Canter
- Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, United States
| | - Robert D. Pike
- Department of Chemistry, College of William and Mary, Williamsburg, Virginia 23185, United States
| | - Yumin Li
- Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, United States
| | - Shouquan Huo
- Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, United States
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5
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Ruthenium (II) β-diketimine as hydroamination catalyst, crystal structure and DFT computations. TRANSIT METAL CHEM 2021. [DOI: 10.1007/s11243-021-00456-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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6
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Taullaj F, Fekl U, Lough AJ. Platinum(IV) complexes of a bulky and exceptionally donating alkyl: 2-adamantyl. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The 2-adamantyl (2-Ad) group is a particularly challenging alkyl to install on a transition metal, with the only reported 2-Ad complexes of platinum being those of Pt(II). The question of whether 2-Ad complexes with platinum in the oxidation state +IV can be made and whether they are stable is answered here. The Pt(IV) compound trans-[(bpy)PtMe2(2-Ad)I] (bpy = 2,2′-bipyridine) was synthesized via oxidative addition of iodomethane to [(COD)PtMe(2-Ad)] (COD = 1,5-cyclooctadiene) in the presence of bpy. Iodide abstraction with silver triflate (triflate anion, OTf− = CF3SO3−) produced trans-[(bpy)PtMe2(2-Ad)(OTf)]. Both complexes were unambiguously characterized by 1D NMR (1H, 13C) spectroscopy and X-ray crystallography. Both show evidence for the large steric bulk of the 2-Ad group (through the conformation of the complex adopted) and also for its exceptionally pronounced trans-influence (very long bonds to iodide/triflate trans to adamantyl). Both of the new platinum(IV) adamantyl complexes were extremely stable, even to prolonged heating.
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Affiliation(s)
- Fioralba Taullaj
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Rd., Mississauga, ON L5L 1C6, Canada
| | - Ulrich Fekl
- Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Rd., Mississauga, ON L5L 1C6, Canada
| | - Alan J. Lough
- Department of Chemistry, University of Toronto, 80 St George St., Toronto, ON M5S 3H6, Canada
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7
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Ríos P, Rodríguez A, Conejero S. Enhancing the catalytic properties of well-defined electrophilic platinum complexes. Chem Commun (Camb) 2020; 56:5333-5349. [PMID: 32373864 DOI: 10.1039/d0cc01438a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Platinum complexes have been often considered as the least reactive of the group 10 triad metals. Slow kinetics are behind this lack of reactivity but, still, some industrially relevant catalytic process are dominated by platinum compounds and sometimes different selectivities can be found in comparison to Ni or Pd. Nevertheless, during the last years, it has been reported that the catalytic behaviour of well-defined platinum derivatives can be improved through a judicious choice of their electronic and steric properties, leading to highly electrophilic or low-electron count platinum systems. In this feature article, we highlight some catalytic processes in which well-defined electrophilic platinum complexes or coordinatively unsaturated systems play an important role in their catalytic activity.
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Affiliation(s)
- Pablo Ríos
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, Centro de Innovación en Química Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, C/Américo Vespucio 49, 41092 Sevilla, Spain.
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8
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Zhang Z, Liu S, Widenhoefer RA. Kinetics and Mechanism of the Platinum(II)‐Catalyzed Hydroarylation of Vinyl Arenes with 1,2‐Dimethylindole. Isr J Chem 2019. [DOI: 10.1002/ijch.201900065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Zhibin Zhang
- French Family Science CenterDuke University Durham NC 27708-0346
| | - Scott Liu
- French Family Science CenterDuke University Durham NC 27708-0346
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9
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Petrović B, Jovanović S, Puchta R, van Eldik R. Mechanistic insight on the chemistry of potential Pt antitumor agents as revealed by collaborative research performed in Kragujevac and Erlangen. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Abstract
Divergent reactivity of organometallic rhodium(I) complexes, which led to the isolation of neutral rhodium silylenes, is described. Addition of PhRSiH2 (R=H, Ph) to the rhodium cyclooctene complex (iPr NNN)Rh(COE) (1-COE; iPr NNN=2,5-[iPr2 P=N(4-iPrC6 H4 )]2 N(C6 H2 )- , COE=cyclooctene) resulted in the oxidative addition of an Si-H bond, providing rhodium(III) silyl hydride complexes (iPr NNN)Rh(H)SiHRPh (R=H, 2-SiH2 Ph; Ph, 2-SiHPh2 ). When the carbonyl complex (iPr NNN)Rh(CO) (1-CO) was treated with hydrosilanes, base-stabilized rhodium(I) silylenes κ2 -N,N-(iPr NNN)(CO)Rh=SiRPh (R=H, 3-SiHPh; Ph, 3-SiPh2 ) were isolated and characterized using multinuclear NMR spectroscopy and X-ray crystallography. Both silylene species feature short Rh-Si bonds [2.262(1) Å, 3-SiHPh; 2.2702(7) Å, 3-SiPh2 ] that agree well with the DFT-computed structures. The overall reaction led to a change in the iPr NNN ligand bonding mode (κ3 →κ2 ) and loss of H2 from PhSiRH2 , as corroborated by deuterium labelling experiments.
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Affiliation(s)
- Connor S MacNeil
- Canadian Centre for Research in Advanced Fluorine Technologies (C-CRAFT), Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive W, Lethbridge, T1K 3M4, Canada
| | - Paul G Hayes
- Canadian Centre for Research in Advanced Fluorine Technologies (C-CRAFT), Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive W, Lethbridge, T1K 3M4, Canada
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11
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Taullaj F, Armstrong D, Datta S, Lough AJ, Fekl U. 2‐Adamantyl Complexes of Platinum. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fioralba Taullaj
- Department of Chemical and Physical Sciences University of Toronto Mississauga 3359 Mississauga Rd. L5L 1C6 Mississauga ON Canada
- Department of Chemistry University of Toronto 80 St George St. M5S 3H6 Toronto ON Canada
| | - David Armstrong
- Department of Chemical and Physical Sciences University of Toronto Mississauga 3359 Mississauga Rd. L5L 1C6 Mississauga ON Canada
- Department of Chemistry University of Toronto 80 St George St. M5S 3H6 Toronto ON Canada
| | - Shaishav Datta
- Department of Chemical and Physical Sciences University of Toronto Mississauga 3359 Mississauga Rd. L5L 1C6 Mississauga ON Canada
| | - Alan J. Lough
- Department of Chemistry University of Toronto 80 St George St. M5S 3H6 Toronto ON Canada
| | - Ulrich Fekl
- Department of Chemical and Physical Sciences University of Toronto Mississauga 3359 Mississauga Rd. L5L 1C6 Mississauga ON Canada
- Department of Chemistry University of Toronto 80 St George St. M5S 3H6 Toronto ON Canada
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12
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Chamyani S, Shahsavari HR, Abedanzadeh S, Golbon Haghighi M, Shabani S, Notash B. Carbon-iodide bond activation by cyclometalated Pt (II) complexes bearing tricyclohexylphosphine ligand: A comparative kinetic study and theoretical elucidation. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4674] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Samira Chamyani
- Department of Chemistry; Institute for Advanced Studies in Basic Sciences (IASBS); Zanjan 45137-66731 Iran
| | - Hamid R. Shahsavari
- Department of Chemistry; Institute for Advanced Studies in Basic Sciences (IASBS); Zanjan 45137-66731 Iran
| | - Sedigheh Abedanzadeh
- Institute of Biochemistry and Biophysics (IBB), University of Tehran; Tehran Iran
| | | | - Sepideh Shabani
- Department of Chemistry; Institute for Advanced Studies in Basic Sciences (IASBS); Zanjan 45137-66731 Iran
| | - Behrouz Notash
- Department of Chemistry; Shahid Beheshti University; Evin Tehran 19839-69411 Iran
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13
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Liu SK, Cui XF, Liu XX, Ma HJ, Wei DD, Luo XL, Huang GS. Cobalt(II)-Catalyzed Cross-Dehydrogenative Coupling Reaction of Benzamides with Alcohols to Build C-O Bond. ChemistrySelect 2018. [DOI: 10.1002/slct.201800679] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Sheng-Kang Liu
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
| | - Xin-Feng Cui
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
| | - Xing-Xing Liu
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
| | - Hao-Jie Ma
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
| | - Dai-Dong Wei
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
| | - Xin-Liang Luo
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
| | - Guo-Sheng Huang
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou 730000 China
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14
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Nasser N, Fard MA, Boyle PD, Puddephatt RJ. Oxygen atom transfer to platinum(II): A 2-pyridyloxaziridine and a 2-pyridylnitrone as potential oxygen atom donors. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Watts D, Wang D, Zavalij PY, Vedernikov AN. Novel Sulfonated CNN Pincer Ligands for Facile C−H Activation at a Pt(II) Center. Isr J Chem 2017. [DOI: 10.1002/ijch.201700063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- David Watts
- Department of Chemistry and Biochemistry University of Maryland College Park MD 20742
| | - Daoyong Wang
- Department of Chemistry and Biochemistry University of Maryland College Park MD 20742
| | - Peter Y. Zavalij
- Department of Chemistry and Biochemistry University of Maryland College Park MD 20742
| | - Andrei N. Vedernikov
- Department of Chemistry and Biochemistry University of Maryland College Park MD 20742
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16
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Gunsalus NJ, Koppaka A, Park SH, Bischof SM, Hashiguchi BG, Periana RA. Homogeneous Functionalization of Methane. Chem Rev 2017; 117:8521-8573. [PMID: 28459540 DOI: 10.1021/acs.chemrev.6b00739] [Citation(s) in RCA: 242] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
One of the remaining "grand challenges" in chemistry is the development of a next generation, less expensive, cleaner process that can allow the vast reserves of methane from natural gas to augment or replace oil as the source of fuels and chemicals. Homogeneous (gas/liquid) systems that convert methane to functionalized products with emphasis on reports after 1995 are reviewed. Gas/solid, bioinorganic, biological, and reaction systems that do not specifically involve methane functionalization are excluded. The various reports are grouped under the main element involved in the direct reactions with methane. Central to the review is classification of the various reports into 12 categories based on both practical considerations and the mechanisms of the elementary reactions with methane. Practical considerations are based on whether or not the system reported can directly or indirectly utilize O2 as the only net coreactant based only on thermodynamic potentials. Mechanistic classifications are based on whether the elementary reactions with methane proceed by chain or nonchain reactions and with stoichiometric reagents or catalytic species. The nonchain reactions are further classified as CH activation (CHA) or CH oxidation (CHO). The bases for these various classifications are defined. In particular, CHA reactions are defined as elementary reactions with methane that result in a discrete methyl intermediate where the formal oxidation state (FOS) on the carbon remains unchanged at -IV relative to that in methane. In contrast, CHO reactions are defined as elementary reactions with methane where the carbon atom of the product is oxidized and has a FOS less negative than -IV. This review reveals that the bulk of the work in the field is relatively evenly distributed across most of the various areas classified. However, a few areas are only marginally examined, or not examined at all. This review also shows that, while significant scientific progress has been made, greater advances, particularly in developing systems that can utilize O2, will be required to develop a practical process that can replace the current energy and capital intensive natural gas conversion process. We believe that this classification scheme will provide the reader with a rapid way to identify systems of interest while providing a deeper appreciation and understanding, both practical and fundamental, of the extensive literature on methane functionalization. The hope is that this could accelerate progress toward meeting this "grand challenge."
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Affiliation(s)
- Niles Jensen Gunsalus
- The Scripps Energy & Materials Center, The Scripps Research Institute , Jupiter, Florida 33458, United States
| | - Anjaneyulu Koppaka
- The Scripps Energy & Materials Center, The Scripps Research Institute , Jupiter, Florida 33458, United States
| | - Sae Hume Park
- The Scripps Energy & Materials Center, The Scripps Research Institute , Jupiter, Florida 33458, United States
| | - Steven M Bischof
- The Scripps Energy & Materials Center, The Scripps Research Institute , Jupiter, Florida 33458, United States
| | - Brian G Hashiguchi
- The Scripps Energy & Materials Center, The Scripps Research Institute , Jupiter, Florida 33458, United States
| | - Roy A Periana
- The Scripps Energy & Materials Center, The Scripps Research Institute , Jupiter, Florida 33458, United States
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17
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Abstract
A silver-catalyzed chlorination of benzylic, tertiary, and secondary C(sp3)-H bonds was developed. The reaction proceeded with as low as 0.2 mol % catalyst loading at room temperature under air atmosphere with synthetically useful functional group compatibility. The regioselectivity and reactivity tendencies suggest that the chlorination proceeded through a radical pathway, but an intermediate alkylsilver species cannot be ruled out.
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Affiliation(s)
- Jun Ozawa
- Graduate School of Pharmaceutical Sciences, The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Motomu Kanai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,JST, ERATO , Kanai Life Science Catalysis Project, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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18
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Petersen AR, White AJP, Britovsek GJP. Divergent reactivity of platinum(ii) and palladium(ii) methylperoxo complexes and the formation of an unusual hemi-aminal complex. Dalton Trans 2016; 45:14520-3. [PMID: 27283971 DOI: 10.1039/c6dt01691j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 6,6''-diaminoterpyridine palladium(ii) methylperoxo complex eliminates methyl hydroperoxide and reacts with acetone to form a novel hemi-aminal palladium complex, whereas the analogous platinum(ii) complex generates formaldehyde and a platinum(ii) hydroxo complex.
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Affiliation(s)
- Allan R Petersen
- Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
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19
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Watts D, Wang D, Adelberg M, Zavalij PY, Vedernikov AN. C–H and O2 Activation at a Pt(II) Center Enabled by a Novel Sulfonated CNN Pincer Ligand. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00613] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David Watts
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Daoyong Wang
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Mackenzie Adelberg
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Peter Y. Zavalij
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Andrei N. Vedernikov
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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20
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Niazi M, Shahsavari HR, Haghighi MG, Halvagar MR, Hatami S, Notash B. Carbon–sulfur bond reductive coupling from a platinum(ii) thiolate complex. RSC Adv 2016. [DOI: 10.1039/c6ra21756g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Complex 1 was reacted with different alkyl halides at room temperature. This reaction proceeded via formation of binuclear intermediate complex 3 and through C–S bond reductive coupling to produce alkyl sulfides and corresponding halide complexes 2.
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Affiliation(s)
- Maryam Niazi
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-6731
- Iran
| | - Hamid R. Shahsavari
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-6731
- Iran
| | | | | | - Samaneh Hatami
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-6731
- Iran
| | - Behrouz Notash
- Department of Chemistry
- Shahid Beheshti University
- Tehran 19839-69411
- Iran
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21
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Graux LV, Giorgi M, Buono G, Clavier H. [RuCl2(η6-p-cymene)] complexes bearing phosphinous acid ligands: preparation, application in C–H bond functionalization and mechanistic investigations. Dalton Trans 2016; 45:6491-502. [DOI: 10.1039/c5dt04683a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A series of [RuCl2(η6-p-cymene)] complexes bearing phosphinous acid (PA) ligands have been straightforwardly prepared from the dimer [RuCl2(p-cymene)]2 and secondary phosphine oxides (SPOs) and fully characterized.
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Affiliation(s)
- Lionel V. Graux
- Aix Marseille Université
- Centrale Marseille
- CNRS
- iSm2 UMR 7313
- Marseille
| | - Michel Giorgi
- Aix Marseille Université Spectropole
- Fédération des Sciences Chimiques de Marseille
- 13397 Marseille
- France
| | - Gérard Buono
- Aix Marseille Université
- Centrale Marseille
- CNRS
- iSm2 UMR 7313
- Marseille
| | - Hervé Clavier
- Aix Marseille Université
- Centrale Marseille
- CNRS
- iSm2 UMR 7313
- Marseille
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22
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Rudakov ES, Shul'pin GB. Stable organoplatinum complexes as intermediates and models in hydrocarbon functionalization. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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23
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Campos J, Ortega-Moreno L, Conejero S, Peloso R, López-Serrano J, Maya C, Carmona E. Reactivity of Cationic Agostic and Carbene Structures Derived from Platinum(II) Metallacycles. Chemistry 2015; 21:8883-96. [DOI: 10.1002/chem.201500756] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Indexed: 11/11/2022]
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24
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Kinetics, mechanism and equilibrium studies on the substitution reactions of Pd(II) in reference to Pt(II) complexes with bio-molecules. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.02.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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25
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Kumar R, Ramakrishnan S, Jemmis ED, Jagirdar BR. Implication of a σ-Methane Complex en Route to Elimination of Methane from a Ruthenium Complex: An Experimental and Theoretical Investigation. Organometallics 2015. [DOI: 10.1021/om501248v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rahul Kumar
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Shyama Ramakrishnan
- School of Chemistry, Indian Institute of Science Education & Research, Thiruvananthapuram 695 016, India
| | - Eluvathingal D. Jemmis
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Balaji R. Jagirdar
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
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26
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Transition-metal triflate catalyzed unprecedented formation of oxime ketals of tetrahydrofuran via C–H functionalization. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.10.068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Hazlehurst RJ, Pellarin KR, McCready MS, Puddephatt RJ. Oxidation of dimethylplatinum(II) complexes with malonyl peroxide derivatives. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The reaction of the cyclic peroxides cyclobutane malonoyl peroxide and cyclopentane malonoyl peroxide to dimethylplatinum(II) complexes with the bidentate nitrogen donor ligand 4,4′-di-t-butyl-2,2′-bipyridine (bubpy) gave a mixture of the products of cis and trans oxidative addition, [PtMe2{(O2C)2C(C3H6)}(bubpy)] and [PtMe2{(O2C)2C(C4H8)}(bubpy)], respectively. The cis isomers exist with a chelating dicarboxylate ligand, forming a six-membered ring, while the trans isomers are thought to exist as oligomers, which may react with water or solvent to give complexes containing a monodentate dicarboxylate ligand. Equilibration of the product of cis oxidative addition, cis-[PtMe2{(O2C)2C(C3H6)}(bubpy)], with oxalic or phthalic acid to give equilibria with the oxalate cis-[PtMe2(O4C2)(bubpy)] or phthalate cis-[PtMe2{(O2C)2C6H4}(bubpy)] derivative, respectively, indicated the expected sequence of chelate stability oxalate > cyclobutane malonate > phthalate.
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Affiliation(s)
| | - Kyle R. Pellarin
- Department of Chemistry, University of Western Ontario, London, ON N6A 5B7, Canada
| | - Matthew S. McCready
- Department of Chemistry, University of Western Ontario, London, ON N6A 5B7, Canada
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28
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Rivada-Wheelaghan O, Roselló-Merino M, Díez J, Maya C, López-Serrano J, Conejero S. Formation of C–X Bonds through Stable Low-Electron-Count Cationic Platinum(IV) Alkyl Complexes Stabilized by N-Heterocyclic Carbenes. Organometallics 2014. [DOI: 10.1021/om500881k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Orestes Rivada-Wheelaghan
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Centro de Innovación en Química
Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Marta Roselló-Merino
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Centro de Innovación en Química
Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Josefina Díez
- Departamento
de Química Orgánica e Inorgánica, Universidad de Oviedo, C/ Julián Clavería 8, 33006, Oviedo, Spain
| | - Celia Maya
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Centro de Innovación en Química
Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Joaquín López-Serrano
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Centro de Innovación en Química
Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Salvador Conejero
- Instituto
de Investigaciones Químicas (IIQ), Departamento de Química
Inorgánica, Centro de Innovación en Química
Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
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29
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Scheuermann ML, Goldberg KI. Reactions of Pd and Pt Complexes with Molecular Oxygen. Chemistry 2014; 20:14556-68. [DOI: 10.1002/chem.201402599] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Margaret L. Scheuermann
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195 (USA), Fax: (+1) 206‐685‐8665
| | - Karen I. Goldberg
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195 (USA), Fax: (+1) 206‐685‐8665
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30
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Petersen AR, Taylor RA, Vicente-Hernández I, Mallender PR, Olley H, White AJP, Britovsek GJP. Oxygen Insertion into Metal Carbon Bonds: Formation of Methylperoxo Pd(II) and Pt(II) Complexes via Photogenerated Dinuclear Intermediates. J Am Chem Soc 2014; 136:14089-99. [DOI: 10.1021/ja5055143] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Allan R. Petersen
- Department of Chemistry, Imperial College London, Exhibition
Road, London, SW7 2AZ, U.K
| | - Russell A. Taylor
- Department of Chemistry, Imperial College London, Exhibition
Road, London, SW7 2AZ, U.K
| | | | - Philip R. Mallender
- Department of Chemistry, Imperial College London, Exhibition
Road, London, SW7 2AZ, U.K
| | - Harriet Olley
- Department of Chemistry, Imperial College London, Exhibition
Road, London, SW7 2AZ, U.K
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Exhibition
Road, London, SW7 2AZ, U.K
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31
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Moustafa ME, Boyle PD, Puddephatt RJ. Carbon–Hydrogen versus Nitrogen–Oxygen Bond Activation in Reactions of N-Oxide Derivatives of 2,2′-Bipyridine and 1,10-Phenanthroline with a Dimethylplatinum(II) Complex. Organometallics 2014. [DOI: 10.1021/om500712e] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Mohamed E. Moustafa
- Department
of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
- Department
of Chemistry, Faculty of Education, Suez Canal University, Arish, Egypt
| | - Paul D. Boyle
- Department
of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Richard J. Puddephatt
- Department
of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
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32
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Wang S, Ni Z, Wang Y, Pang Y, Pan Y. Highly selective acetoxylation of sulfonamides via using phenyliodine(III) diacetate. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.07.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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33
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Felix RJ, Munro-Leighton C, Gagné MR. Electrophilic Pt(II) complexes: precision instruments for the initiation of transformations mediated by the cation-olefin reaction. Acc Chem Res 2014; 47:2319-31. [PMID: 24845777 PMCID: PMC4139170 DOI: 10.1021/ar500047j] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
![]()
A discontinuity
exists between the importance of the cation–olefin
reaction as the principal C–C bond forming reaction in terpene
biosynthesis and the synthetic tools for mimicking this reaction under
catalyst control; that is, having the product identity, stereochemistry,
and functionality under the control of a catalyst. The main reason
for this deficiency is that the cation–olefin reaction starts
with a reactive intermediate (a carbocation) that reacts exothermically
with an alkene to reform the reactive intermediate; not to mention
that reactive intermediates can also react in nonproductive fashions.
In this Account, we detail our efforts to realize catalyst control
over this most fundamental of reactions and thereby access steroid like
compounds. Our story is organized around our progress in each component
of the cascade reaction: the metal controlled electrophilic initiation,
the propagation and termination of the cyclization (the cyclase phase),
and the turnover deplatinating events. Electrophilic Pt(II) complexes
efficiently initiate the cation–olefin reaction by first coordinating
to the alkene with selection rules that favor less substituted alkenes
over more substituted alkenes. In complex substrates with multiple
alkenes, this preference ensures that the least substituted alkene
is always the better ligand for the Pt(II) initiator, and consequently
the site at which all electrophilic chemistry is initiated. This control
element is invariant. With a suitably electron deficient ligand set,
the catalyst then activates the coordinated alkene to intramolecular
addition by a second alkene, which initiates the cation–olefin
reaction cascade and generates an organometallic Pt(II)-alkyl. Deplatination
by a range of mechanisms (β-H elimination, single electron oxidation,
two-electron oxidation, etc.) provides an additional level of control
that ultimately enables A-ring functionalizations that are orthogonal
to the cyclase cascade. We particularly focus on reactions that combine
an initiated cyclization reaction with a turnover defining β-hydride
elimination, fluorination, and oxygenation. These latter demetalation
schemes lead to new compounds functionalized at the C3 carbon of the
A-ring (steroid numbering convention) and thus provide access to interesting
potentially bioactive targets. Progress toward efficient and diverse
polycyclization reactions has been achieved by investing in both synthetic
challenges and fundamental organometallic reactivity. In addition
to an interest in the entrance and exit of the metal catalyst from
this reaction scheme, we have been intrigued by the role of neighboring
group participation in the cyclase phase. Computational studies have
served to provide nuance and clarity on several key aspects, including
the role (and consequences) of neighboring group participation in
cation generation and stabilization. For example, these calculations
have demonstrated that traversing carbonium ion transition states
significantly impacts the kinetics of competitive 6-endo and 5-exo
A-ring forming reactions. The resulting nonclassical transition states
then become subject to a portion of the strain energy inherent to
bicyclic structures, with the net result being that the 6-endo pathway
becomes kinetically favored for alkene nucleophiles, in contrast to
heteroatom nucleophiles which progress through classical transition
states and preferentially follow 5-exo pathways. These vignettes articulate
our approach to achieving the desired catalyst control.
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Affiliation(s)
- Ryan J. Felix
- Department
of Chemistry, Austin College, 900 N. Grand Ave., Sherman, Texas 75090, United States
| | - Colleen Munro-Leighton
- Department
of Chemistry, Elmhurst College, 190 S. Prospect Ave., Elmhurst, Illinois 60126, United States
| | - Michel R. Gagné
- Department
of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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34
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Roselló-Merino M, Rivada-Wheelaghan O, Ortuño MA, Vidossich P, Dı́ez J, Lledós A, Conejero S. Coordinatively Unsaturated T-Shaped Platinum(II) Complexes Stabilized by Small N-Heterocyclic Carbene Ligands. Synthesis and Cyclometalation. Organometallics 2014. [DOI: 10.1021/om500416n] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Marta Roselló-Merino
- Instituto de Investigaciones
Quı́micas
(IIQ), Departamento de Quı́mica Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Orestes Rivada-Wheelaghan
- Instituto de Investigaciones
Quı́micas
(IIQ), Departamento de Quı́mica Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Manuel A. Ortuño
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola
del Vallès, Spain
| | - Pietro Vidossich
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola
del Vallès, Spain
| | - Josefina Dı́ez
- Departamento de Quı́mica Orgánica
e Inorgánica, Universidad de Oviedo, C/Julián Clavería
8, 33006 Oviedo, Spain
| | - Agustı́ Lledós
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola
del Vallès, Spain
| | - Salvador Conejero
- Instituto de Investigaciones
Quı́micas
(IIQ), Departamento de Quı́mica Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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35
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Konnick MM, Bischof SM, Yousufuddin M, Hashiguchi BG, Ess DH, Periana RA. A Mechanistic Change Results in 100 Times Faster CH Functionalization for Ethane versus Methane by a Homogeneous Pt Catalyst. J Am Chem Soc 2014; 136:10085-94. [DOI: 10.1021/ja504368r] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Michael M. Konnick
- The Scripps Energy & Materials Center, Department of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
| | - Steven M. Bischof
- The Scripps Energy & Materials Center, Department of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
| | - Muhammed Yousufuddin
- Center
for Nanostructured Materials, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Brian G. Hashiguchi
- The Scripps Energy & Materials Center, Department of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
| | - Daniel H. Ess
- Department
of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Roy A. Periana
- The Scripps Energy & Materials Center, Department of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
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36
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Prantner JD, Kaminsky W, Goldberg KI. Methylplatinum(II) and Molecular Oxygen: Oxidation to Methylplatinum(IV) in Competition with Methyl Group Transfer To Form Dimethylplatinum(IV). Organometallics 2014. [DOI: 10.1021/om500243n] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jason D. Prantner
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Werner Kaminsky
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Karen I. Goldberg
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
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37
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Wang L, Hunter SC, Song Z, Steren CA, Chen T, Wei Z, Cai H, Xue ZL. CH Bond Activation during and after the Reactions of a Metallacyclic Amide with Silanes: Formation of a μ-Alkylidene Hydride Complex, Its H-D Exchange, and β-H Abstraction by a Hydride Ligand. Chemistry 2014; 20:6033-9. [DOI: 10.1002/chem.201303166] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 01/21/2014] [Indexed: 11/10/2022]
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38
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Wekesa IM, Jaganyi D. Kinetic and mechanistic studies of 1,3-bis(2-pyridylimino)isoindolate Pt(ii) derivatives. Experimental and new computational approach. Dalton Trans 2014; 43:2549-58. [DOI: 10.1039/c3dt52272e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Walter MD, White PS, Schauer CK, Brookhart M. Stability and dynamic processes in 16VE iridium(III) ethyl hydride and rhodium(I) σ-ethane complexes: experimental and computational studies. J Am Chem Soc 2013; 135:15933-47. [PMID: 24053635 DOI: 10.1021/ja4079539] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Iridium(I) and rhodium(I) ethyl complexes, (PONOP)M(C2H5) (M = Ir (1-Et), Rh (2-Et)) and the iridium(I) propyl complex (PONOP)Ir(C3H7) (1-Pr), where PONOP is 2,6-(tBu2PO)2C5H3N, have been prepared. Low-temperature protonation of the Ir complexes yields the alkyl hydrides, (PONOP)Ir(H)(R) (1-(H)(Et)(+) and 1-(H)(Pr)(+)), respectively. Dynamic (1)H NMR characterization of 1-(H)(Et)(+) establishes site exchange between the Ir-H and Ir-CH2 protons (ΔG(exH)(‡)(-110 °C) = 7.2(1) kcal/mol), pointing to a σ-ethane intermediate. By dynamic (13)C NMR spectroscopy, the exchange barrier between the α and β carbons ("chain-walking") was measured (ΔG(exC)(‡)(-110 °C) = 8.1(1) kcal/mol). The barrier for ethane loss is 17.4(1) kcal/mol (-40 °C), to be compared with the reported barrier to methane loss in 1-(H)(Me)(+) of 22.4 kcal/mol (22 °C). A rhodium σ-ethane complex, (PONOP)Rh(EtH) (2-(EtH)(+)), was prepared by protonation of 2-Et at -150 °C. The barrier for ethane loss (ΔG(dec)(‡)(-132 °C) = 10.9(2) kcal/mol) is lower than for the methane complex, 2-(MeH)(+), (ΔG(dec)(‡)(-87 °C) = 14.5(4) kcal/mol). Full spectroscopic characterization of 2-(EtH)(+) is reported, a key feature of which is the upfield signal at -31.2 ppm for the coordinated CH3 group in the (13)C NMR spectrum. The exchange barrier of the hydrogens of the coordinated methyl group is too low to be measured, but the chain-walking barrier of 7.2(1) kcal/mol (-132 °C) is observable by (13)C NMR. The coordination mode of the alkane ligand and the exchange pathways for the Rh and Ir complexes are evaluated by DFT studies. On the basis of the computational studies, it is proposed that chain-walking occurs by different mechanisms: for Rh, the lowest energy path involves a η(2)-ethane transition state, while for Ir, the lowest energy exchange pathway proceeds through the symmetrical ethylene dihydride complex.
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Affiliation(s)
- Marc D Walter
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
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40
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Mironov OA, Bischof SM, Konnick MM, Hashiguchi BG, Ziatdinov VR, Goddard WA, Ahlquist M, Periana RA. Using Reduced Catalysts for Oxidation Reactions: Mechanistic Studies of the “Periana-Catalytica” System for CH4 Oxidation. J Am Chem Soc 2013; 135:14644-58. [DOI: 10.1021/ja404895z] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Oleg A. Mironov
- Loker Hydrocarbon Research Institute, University of Southern California, University Park,
Los Angeles, California 90089, United States
| | - Steven M. Bischof
- The Scripps Energy & Materials Center, The Scripps Research Institute, 130 Scripps Way #3A1, Jupiter, Florida 33458, United States
| | - Michael M. Konnick
- The Scripps Energy & Materials Center, The Scripps Research Institute, 130 Scripps Way #3A1, Jupiter, Florida 33458, United States
| | - Brian G. Hashiguchi
- The Scripps Energy & Materials Center, The Scripps Research Institute, 130 Scripps Way #3A1, Jupiter, Florida 33458, United States
| | - Vadim R. Ziatdinov
- Loker Hydrocarbon Research Institute, University of Southern California, University Park,
Los Angeles, California 90089, United States
| | - William A. Goddard
- Materials and Process Simulation
Center, California Institute of Technology, Pasadena, California 91125, United States
| | - Mårten Ahlquist
- Materials and Process Simulation
Center, California Institute of Technology, Pasadena, California 91125, United States
| | - Roy A. Periana
- The Scripps Energy & Materials Center, The Scripps Research Institute, 130 Scripps Way #3A1, Jupiter, Florida 33458, United States
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41
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Ortuño MA, Conejero S, Lledós A. True and masked three-coordinate T-shaped platinum(II) intermediates. Beilstein J Org Chem 2013; 9:1352-82. [PMID: 23946831 PMCID: PMC3740817 DOI: 10.3762/bjoc.9.153] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 06/10/2013] [Indexed: 11/23/2022] Open
Abstract
Although four-coordinate square-planar geometries, with a formally 16-electron counting, are absolutely dominant in isolated Pt(II) complexes, three-coordinate, 14-electron Pt(II) complexes are believed to be key intermediates in a number of platinum-mediated organometallic transformations. Although very few authenticated three-coordinate Pt(II) complexes have been characterized, a much larger number of complexes can be described as operationally three-coordinate in a kinetic sense. In these compounds, which we have called masked T-shaped complexes, the fourth position is occupied by a very weak ligand (agostic bond, solvent molecule or counteranion), which can be easily displaced. This review summarizes the structural features of the true and masked T-shaped Pt(II) complexes reported so far and describes synthetic strategies employed for their formation. Moreover, recent experimental and theoretical reports are analyzed, which suggest the involvement of such intermediates in reaction mechanisms, particularly C-H bond-activation processes.
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Affiliation(s)
- Manuel A Ortuño
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
| | - Salvador Conejero
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Agustí Lledós
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
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42
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Ahmed TS, Tonks IA, Labinger JA, Bercaw JE. Kinetics and Mechanism of Indene C–H Bond Activation by [(COD)Ir(μ2-OH)]2. Organometallics 2013. [DOI: 10.1021/om400230j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tonia S. Ahmed
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - Ian A. Tonks
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - Jay A. Labinger
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
| | - John E. Bercaw
- Arnold and Mabel
Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California
91125, United States
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43
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Braunschweig H, Brenner P, Dewhurst RD, Jimenez-Halla JOC, Kupfer T, Rais D, Uttinger K. Maximierung von koordinativer und elektronischer Ungesättigtheit: dreifach koordinierte dikationische Platinkomplexe. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209717] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Braunschweig H, Brenner P, Dewhurst RD, Jimenez-Halla JOC, Kupfer T, Rais D, Uttinger K. Maximizing Coordinative and Electronic Unsaturation: Three-Coordinate Dicationic Platinum Complexes. Angew Chem Int Ed Engl 2013; 52:2981-4. [DOI: 10.1002/anie.201209717] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Indexed: 11/08/2022]
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45
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Shul'pin GB. C–H functionalization: thoroughly tuning ligands at a metal ion, a chemist can greatly enhance catalyst's activity and selectivity. Dalton Trans 2013; 42:12794-818. [DOI: 10.1039/c3dt51004b] [Citation(s) in RCA: 155] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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46
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DeMott JC, Bhuvanesh N, Ozerov OV. Frustrated Lewis pair-like splitting of aromatic C–H bonds and abstraction of halogen atoms by a cationic [(FPNP)Pt]+species. Chem Sci 2013. [DOI: 10.1039/c2sc21385k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Ortuño MA, Vidossich P, Ujaque G, Conejero S, Lledós A. Solution dynamics of agostic interactions in T-shaped Pt(ii) complexes from ab initio molecular dynamics simulations. Dalton Trans 2013; 42:12165-72. [DOI: 10.1039/c3dt50761k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chow C, Patrick BO, Legzdins P. Thermal Chemistry of a Tungsten Trimethylsilylallyl Complex in Benzene and Fluorobenzenes. Organometallics 2012. [DOI: 10.1021/om300765e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Catherine Chow
- Department of Chemistry, The University of British Columbia,
Vancouver, British Columbia, Canada V6T 1Z1
| | - Brian O. Patrick
- Department of Chemistry, The University of British Columbia,
Vancouver, British Columbia, Canada V6T 1Z1
| | - Peter Legzdins
- Department of Chemistry, The University of British Columbia,
Vancouver, British Columbia, Canada V6T 1Z1
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Chow C, Patrick BO, Legzdins P. Intermolecular C–H Activations of Hydrocarbons Initiated by a Tungsten Trimethylsilylallyl Complex. Organometallics 2012. [DOI: 10.1021/om300742y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Catherine Chow
- Department
of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Brian O. Patrick
- Department
of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Peter Legzdins
- Department
of Chemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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