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Chapple DE, Hoffer MA, Boyle PD, Blacquiere JM. Alkyne Hydrofunctionalization Mechanism Including an Off-Cycle Alkoxycarbene Deactivation Complex. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Devon E. Chapple
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 3K7
| | - Megan A. Hoffer
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 3K7
| | - Paul D. Boyle
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 3K7
| | - Johanna M. Blacquiere
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 3K7
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2
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Chapple DE, Boyle PD, Blacquiere JM. Origin of Stability and Inhibition of Cooperative Alkyne Hydrofunctionalization Catalysts. ChemCatChem 2021. [DOI: 10.1002/cctc.202100622] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Devon E. Chapple
- Department of Chemistry Western University 1151 Richmond Street London Ontario N6A 3K7 Canada
| | - Paul D. Boyle
- Department of Chemistry Western University 1151 Richmond Street London Ontario N6A 3K7 Canada
| | - Johanna M. Blacquiere
- Department of Chemistry Western University 1151 Richmond Street London Ontario N6A 3K7 Canada
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3
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Sustainable hydration of alkynes promoted by first row transition metal complexes. Background, highlights and perspectives. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120288] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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4
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Cao TC, Cooksy AL, Grotjahn DB. Origins of High Kinetic ( E)-Selectivity in Alkene Isomerization by a CpRu(PN) Catalyst: a Combined Experimental and Computational Approach. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03497] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas C. Cao
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
| | - Andrew L. Cooksy
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
| | - Douglas B. Grotjahn
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
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5
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Bridge BJ, Boyle PD, Blacquiere JM. endo-Selective Iron Catalysts for Intramolecular Alkyne Hydrofunctionalization. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00307] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Benjamin J. Bridge
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Paul D. Boyle
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Johanna M. Blacquiere
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
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6
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Li J, Zhao Y, Zhu M, Kang L. A density functional theory exploration on the Zn catalyst for acetylene hydration. J Mol Model 2020; 26:105. [PMID: 32307599 DOI: 10.1007/s00894-020-04354-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 03/16/2020] [Indexed: 11/30/2022]
Abstract
The acetylene hydration method to produce acetaldehyde has been widely used for over 130 years; however, a detailed molecular-level understanding of the reaction mechanism is still lacking. In the present work, we systematically investigated the mechanisms of such reactions on ZnCl2, Zn(OH) Cl, and Zn(OH)2 catalysts through density functional theory (DFT) methods. The Fukui function, condensed Fukui function, and Hirshfeld charges enabled us to predict the active sites of the catalysts and acquire electron transfer information. From these data, we found that catalysts bearing hydroxyl groups exhibited relatively low adsorption performances compared with catalysts without this functionality. The calculations demonstrated that the three studied catalysts had three distinct reaction paths. For the Zn(OH)Cl and Zn(OH)2 catalysts, the reaction took place through a one-shift H2O molecule transfer route, avoiding higher energy barrier pathways. Interestingly, we found that the energy required for breaking the O-H bond in water determined the activation energy of the studied catalytic reactions. The activation barrier increased in the order Zn(OH)Cl ≈ Zn(OH)2 < ZnCl2. This trend suggests that Zn(OH)Cl and Zn(OH)2 are promising catalysts for the hydration of acetylene. Graphical abstract.
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Affiliation(s)
- Junqing Li
- School of Chemistry and Chemical Engineering of Shihezi University, Shihezi, 832000, Xinjiang, China.,Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi, 832000, Xinjiang, China
| | - Yu Zhao
- School of Chemistry and Chemical Engineering of Shihezi University, Shihezi, 832000, Xinjiang, China
| | - Mingyuan Zhu
- School of Chemistry and Chemical Engineering of Shihezi University, Shihezi, 832000, Xinjiang, China.,Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi, 832000, Xinjiang, China
| | - Lihua Kang
- School of Chemistry and Chemical Engineering of Shihezi University, Shihezi, 832000, Xinjiang, China. .,Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi, 832000, Xinjiang, China.
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7
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Roh SW, Choi K, Lee C. Transition Metal Vinylidene- and Allenylidene-Mediated Catalysis in Organic Synthesis. Chem Rev 2019; 119:4293-4356. [PMID: 30768261 DOI: 10.1021/acs.chemrev.8b00568] [Citation(s) in RCA: 141] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
With their mechanistic novelty and various modalities of reactivity, transition metal unsaturated carbene (alkenylidene) complexes have emerged as versatile intermediates for new reaction discovery. In particular, the past decade has witnessed remarkable advances in the chemistry of metal vinylidenes and allenylidenes, leading to the evolution of a diverse array of new catalytic transformations that are mechanistically distinct from those developed in the previous two decades. This review aims to provide a survey of the recent achievements in the development of organic reactions that make use of transition metal alkenylidenes as catalytic intermediates and their applications to organic synthesis.
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Affiliation(s)
- Sang Weon Roh
- Department of Chemistry , Seoul National University , Seoul 08826 , Republic of Korea
| | - Kyoungmin Choi
- Department of Chemistry , Seoul National University , Seoul 08826 , Republic of Korea
| | - Chulbom Lee
- Department of Chemistry , Seoul National University , Seoul 08826 , Republic of Korea
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8
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Kamdar JM, Grotjahn DB. An Overview of Significant Achievements in Ruthenium-Based Molecular Water Oxidation Catalysis. Molecules 2019; 24:molecules24030494. [PMID: 30704078 PMCID: PMC6385003 DOI: 10.3390/molecules24030494] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 01/16/2019] [Accepted: 01/18/2019] [Indexed: 12/03/2022] Open
Abstract
Fossil fuels (coal, oil, natural gas) are becoming increasingly disfavored as long-term energy options due to concerns of scarcity and environmental consequences (e.g., release of anthropogenic CO2). Hydrogen gas, on the other hand, has gained popularity as a clean-burning fuel because the only byproduct from its reaction with O2 is H2O. In recent decades, hydrogen derived from water splitting has been a topic of extensive research. The bottleneck of the water splitting reaction is the difficult water oxidation step (2H2O → O2 + 4H+ + 4e−), which requires an effective and robust catalyst to overcome its high kinetic barrier. Research in water oxidation by molecular ruthenium catalysts enjoys a rich history spanning nearly 40 years. As the diversity of novel ligands continues to widen, the relationship between ligand geometry or electronics, and catalyst activity is undoubtedly becoming clearer. The present review highlights, in the authors’ opinion, some of the most impactful discoveries in the field and explores the evolution of ligand design that has led to the current state of the art.
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Affiliation(s)
- Jayneil M Kamdar
- Department of Chemistry and Biochemistry, San Diego State University; San Diego, CA 92182-1030, USA.
| | - Douglas B Grotjahn
- Department of Chemistry and Biochemistry, San Diego State University; San Diego, CA 92182-1030, USA.
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9
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Stubbs JM, Bridge BJ, Blacquiere JM. Optimizing ligand structure for low-loading and fast catalysis for alkynyl-alcohol and -amine cyclization. Dalton Trans 2019; 48:7928-7937. [DOI: 10.1039/c9dt01870k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The catalytic performance was evaluated for a series of [Ru(Cp/Cp*)(PR2NR′2)(MeCN)]PF6 complexes, in which the steric and electronic properties of the primary coordination sphere were varied (R = Ph, t-Bu, Bn; and Cp vs. Cp*).
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Affiliation(s)
- James M. Stubbs
- Department of Chemistry
- University of Western Ontario
- London
- Canada
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10
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Yang L, Chen H, Su R, Xu C, Dai B. Cu(I)-Catalyzed Acetylene Hydration Using S-Containing Organic Compounds as Ligands. Catal Letters 2018. [DOI: 10.1007/s10562-018-2534-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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11
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de Aguirre A, Díez-González S, Maseras F, Martín M, Sola E. The Acetate Proton Shuttle between Mutually Trans Ligands. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00417] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adiran de Aguirre
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Silvia Díez-González
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2Az, U.K
| | - Feliu Maseras
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Marta Martín
- Instituto de Síntesis Química y Catálisis Homogénea, CSIC − Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Eduardo Sola
- Instituto de Síntesis Química y Catálisis Homogénea, CSIC − Universidad de Zaragoza, 50009 Zaragoza, Spain
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12
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Stubbs JM, Chapple DE, Boyle PD, Blacquiere JM. Catalyst Pendent-Base Effects on Cyclization of Alkynyl Amines. ChemCatChem 2018. [DOI: 10.1002/cctc.201800713] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- James M. Stubbs
- Department of Chemistry; University of Western Ontario; London, Ontario Canada N6A 5B7
| | - Devon E. Chapple
- Department of Chemistry; University of Western Ontario; London, Ontario Canada N6A 5B7
| | - Paul D. Boyle
- Department of Chemistry; University of Western Ontario; London, Ontario Canada N6A 5B7
| | - Johanna M. Blacquiere
- Department of Chemistry; University of Western Ontario; London, Ontario Canada N6A 5B7
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13
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Zamorano A, Rendón N, López-Serrano J, Álvarez E, Carmona E. Activation of Small Molecules by the Metal–Amido Bond of Rhodium(III) and Iridium(III) (η5-C5Me5)M-Aminopyridinate Complexes. Inorg Chem 2017; 57:150-162. [DOI: 10.1021/acs.inorgchem.7b02283] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ana Zamorano
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Nuria Rendón
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Joaquín López-Serrano
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio 49, 41092 Sevilla, Spain
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14
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Benedetti M, De Castro F, Lamacchia V, Pacifico C, Natile G, Fanizzi FP. Insertion of terminal alkyne into Pt-N bond of the square planar [PtI 2(Me 2phen)] complex. Dalton Trans 2017; 46:15819-15826. [PMID: 29099524 DOI: 10.1039/c7dt03644b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of [PtX2(Me2phen)] complexes (X = Cl, Br, I; Me2phen = 2,9-dimethyl-1,10-phenanthroline) with terminal alkynes has been investigated. Although the dichlorido species [PtCl2(Me2phen)] exhibits negligible reactivity, the bromido and iodido derivatives lead in short time to the formation of five-coordinate Pt(ii) complexes of the type [PtX2(Me2phen)(η2-CH[triple bond, length as m-dash]CR)] (X = Br, I; R = Ph, n-Bu), in equilibrium with the starting reagents. Similar to analogous complexes with simple acetylene, the five coordinate species can also undergo dissociation of an halido ligand and formation of the transient square-planar cationic species [PtX(Me2phen)(η2-CH[triple bond, length as m-dash]CR)]+. This latter can further evolve to give an unusual, sparingly soluble square planar product where the former terminal alkyne is converted into a :C[double bond, length as m-dash]C(H)(R) moiety with the α-carbon bridging the Pt(ii) core with one of the two N-donors of coordinated Me2phen. The final product [PtX2{κ2-N,C-(Z)-N[combining low line]1-N10-C[combining low line][double bond, length as m-dash]C(H)(R)}] (N1-N10 = 2,9-dimethyl-1,10-phenanthroline; X = Br, I) contains a Pt-N-C-C-N-C six-membered chelate ring in a square planar Pt(ii) coordination environment.
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Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
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15
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Schreyer M, Hintermann L. Is the tungsten(IV) complex (NEt 4) 2[WO(mnt) 2] a functional analogue of acetylene hydratase? Beilstein J Org Chem 2017; 13:2332-2339. [PMID: 29181113 PMCID: PMC5687055 DOI: 10.3762/bjoc.13.230] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 10/04/2017] [Indexed: 11/23/2022] Open
Abstract
The tungsten(IV) complex (Et4N)2[W(O)(mnt)2] (1; mnt = maleonitriledithiolate) was proposed (Sarkar et al., J. Am. Chem. Soc.1997, 119, 4315) to be a functional analogue of the active center of the enzyme acetylene hydratase from Pelobacter acetylenicus, which hydrates acetylene (ethyne; 2) to acetaldehyde (ethanal; 3). In the absence of a satisfactory mechanistic proposal for the hydration reaction, we considered the possibility of a metal–vinylidene type activation mode, as it is well established for ruthenium-based alkyne hydration catalysts with anti-Markovnikov regioselectivity. To validate the hypothesis, the regioselectivity of tungsten-catalyzed alkyne hydration of a terminal, higher alkyne had to be determined. However, complex 1 was not a competent catalyst for the hydration of 1-octyne under the conditions tested. Furthermore, we could not observe the earlier reported hydration activity of complex 1 towards acetylene. A critical assessment of, and a possible explanation for the earlier reported results are offered. The title question is answered with "no".
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Affiliation(s)
- Matthias Schreyer
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching bei München, Germany.,TUM Catalysis Research Center, Ernst-Otto-Fischer-Str. 1, 85748 Garching bei München, Germany
| | - Lukas Hintermann
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching bei München, Germany.,TUM Catalysis Research Center, Ernst-Otto-Fischer-Str. 1, 85748 Garching bei München, Germany
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16
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Davis HJ, Phipps RJ. Harnessing non-covalent interactions to exert control over regioselectivity and site-selectivity in catalytic reactions. Chem Sci 2017; 8:864-877. [PMID: 28572898 PMCID: PMC5452277 DOI: 10.1039/c6sc04157d] [Citation(s) in RCA: 255] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 10/05/2016] [Indexed: 12/20/2022] Open
Abstract
Asymmetric catalysis has been revolutionised by the realisation that attractive non-covalent interactions such as hydrogen bonds and ion pairs can act as powerful controllers of enantioselectivity when incorporated into appropriate small molecule chiral scaffolds. Given these tremendous advances it is surprising that there are still a relatively limited number of examples of non-covalent interactions being harnessed for control of regioselectivity or site-selectivity in catalysis, two other fundamental selectivity aspects facing the synthetic chemist. This perspective examines the progress that has been made in this area thus far using non-covalent interactions in conjunction with transition metal catalysis as well as in the context of purely organic catalysts. We hope this will highlight the great potential in this approach for designing selective catalytic reactions.
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Affiliation(s)
- Holly J Davis
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK .
| | - Robert J Phipps
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK .
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17
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Bow JJ, Boyle PD, Blacquiere JM. Substrate‐Mediated Deactivation of a Ru(P
t
Bu
2
N
Bn
2
) Cooperative Complex. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500798] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- John‐Paul J. Bow
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada, N6A 5B7, http://www.uwo.ca/chem/people/faculty/blacquiere.htm
| | - Paul D. Boyle
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada, N6A 5B7, http://www.uwo.ca/chem/people/faculty/blacquiere.htm
| | - Johanna M. Blacquiere
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada, N6A 5B7, http://www.uwo.ca/chem/people/faculty/blacquiere.htm
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18
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Marelius DC, Darrow EH, Moore CE, Golen JA, Rheingold AL, Grotjahn DB. Hydrogen-Bonding Pincer Complexes with Two Protic N-Heterocyclic Carbenes from Direct Metalation of a 1,8-Bis(imidazol-1-yl)carbazole by Platinum, Palladium, and Nickel. Chemistry 2015; 21:10988-92. [DOI: 10.1002/chem.201501945] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Indexed: 11/06/2022]
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19
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Zamorano A, Rendón N, Valpuesta JEV, Álvarez E, Carmona E. Synthesis and Reactivity toward H2 of (η(5)-C5Me5)Rh(III) Complexes with Bulky Aminopyridinate Ligands. Inorg Chem 2015; 54:6573-81. [PMID: 26067207 DOI: 10.1021/acs.inorgchem.5b00905] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electrophilic, cationic Rh(III) complexes of composition [(η(5)-C5Me5)Rh(Ap)](+), (1(+)), were prepared by reaction of [(η(5)-C5Me5)RhCl2]2 and LiAp (Ap = aminopyridinate ligand) followed by chloride abstraction with NaBArF (BArF = B[3,5-(CF3)2C6H3]4). Reactions of cations 1(+) with different Lewis bases (e.g., NH3, 4-dimethylaminopyridine, or CNXyl) led in general to monoadducts 1·L(+) (L = Lewis base; Xyl = 2,6-Me2C6H3), but carbon monoxide provided carbonyl-carbamoyl complexes 1·(CO)2(+) as a result of metal coordination and formal insertion of CO into the Rh-Namido bond of complexes 1(+). Arguably, the most relevant observation reported in this study stemmed from the reactions of complexes 1(+) with H2. (1)H NMR analyses of the reactions demonstrated a H2-catalyzed isomerization of the aminopyridinate ligand in cations 1(+) from the ordinary κ(2)-N,N' coordination to a very uncommon, formally tridentate κ-N,η(3) pseudoallyl bonding mode (complexes 3(+)) following benzylic C-H activation within the xylyl substituent of the pyridinic ring of the aminopyridinate ligand. The isomerization entailed in addition H-H and N-H bond activation and mimicked previous findings with the analogous iridium complexes. However, in dissimilarity with iridium, rhodium complexes 1(+) reacted stoichiometrically at 20 °C with excess H2. The transformations resulted in the hydrogenation of the C5Me5 and Ap ligands with concurrent reduction to Rh(I) and yielded complexes [(η(4)-C5Me5H)Rh(η(6)-ApH)](+), (2(+)), in which the pyridinic xylyl substituent is η(6)-bonded to the rhodium(I) center. New compounds reported were characterized by microanalysis and NMR spectroscopy. Representative complexes were additionally investigated by X-ray crystallography.
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Affiliation(s)
- Ana Zamorano
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) Consejo Superior de Investigaciones Científicas (CSIC), and Universidad de Sevilla Av. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla, Spain
| | - Nuria Rendón
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) Consejo Superior de Investigaciones Científicas (CSIC), and Universidad de Sevilla Av. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla, Spain
| | - José E V Valpuesta
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) Consejo Superior de Investigaciones Científicas (CSIC), and Universidad de Sevilla Av. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla, Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) Consejo Superior de Investigaciones Científicas (CSIC), and Universidad de Sevilla Av. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla, Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) Consejo Superior de Investigaciones Científicas (CSIC), and Universidad de Sevilla Av. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla, Spain
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20
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2013. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.09.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Oldenhof S, Lutz M, van der Vlugt JI, Reek JNH. Intermolecular C–H activation with an Ir-METAMORPhos piano-stool complex – multiple reaction steps at a reactive ligand. Chem Commun (Camb) 2015; 51:15200-3. [DOI: 10.1039/c5cc05916j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Reaction of phenylacetylene with an IrIII(METAMORPhos) complex generates a unique four-membered IrPNC metallacyclic species with an exocyclic CC fragment.
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Affiliation(s)
- S. Oldenhof
- Homogeneous, Bioinspired & Supramolecular Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098 XH Amsterdam
- the Netherlands
| | - M. Lutz
- Crystal and Structural Chemistry
- Bijvoet Center for Biomolecular Research
- Utrecht University
- the Netherlands
| | - J. I. van der Vlugt
- Homogeneous, Bioinspired & Supramolecular Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098 XH Amsterdam
- the Netherlands
| | - J. N. H. Reek
- Homogeneous, Bioinspired & Supramolecular Catalysis
- van't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098 XH Amsterdam
- the Netherlands
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22
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Espada MF, Poveda ML, Carmona E. Reactivity of a Cationic (C5Me5)IrIII-Cyclometalated Phosphine Complex with Alkynes. Organometallics 2014. [DOI: 10.1021/om5009742] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Marı́a F. Espada
- Instituto de Investigaciones Quı́micas (IIQ),
Departamento de Quı́mica Inorgánica and Centro
de Innovación en Quı́mica Avanzada (ORFEO-CINQA), CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Manuel L. Poveda
- Instituto de Investigaciones Quı́micas (IIQ),
Departamento de Quı́mica Inorgánica and Centro
de Innovación en Quı́mica Avanzada (ORFEO-CINQA), CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Quı́micas (IIQ),
Departamento de Quı́mica Inorgánica and Centro
de Innovación en Quı́mica Avanzada (ORFEO-CINQA), CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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23
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24
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Toda T, Kuwata S, Ikariya T. Unsymmetrical pincer-type ruthenium complex containing β-protic pyrazole and N-heterocyclic carbene arms: comparison of Brønsted acidity of NH groups in second coordination sphere. Chemistry 2014; 20:9539-42. [PMID: 24965086 DOI: 10.1002/chem.201403179] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Indexed: 12/30/2022]
Abstract
A reaction of a 2-(imidazol-1-yl)methyl-6-(pyrazol-3-yl)pyridine with [RuCl2 (PPh3 )3 ] resulted in tautomerization of the imidazole unit to afford the unsymmetrical pincer-type ruthenium complex 2 containing a protic pyrazole and N-heterocyclic carbene (NHC) arms. Deprotonation of 2 with one equivalent of a base led to the formation of the NHC-pyrazolato complex 3, indicating that the protic NHC arm is less acidic. When 2 was treated with two equivalents of a base under H2 or in 2-propanol, the hydrido complex 4 containing protic NHC and pyrazolato groups was obtained through metal-ligand cooperation.
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Affiliation(s)
- Tatsuro Toda
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552 (Japan), Fax: (+81) 3-5734-2637
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25
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Breit B, Gellrich U, Li T, Lynam JM, Milner LM, Pridmore NE, Slattery JM, Whitwood AC. Mechanistic insight into the ruthenium-catalysed anti-Markovnikov hydration of alkynes using a self-assembled complex: a crucial role for ligand-assisted proton shuttle processes. Dalton Trans 2014; 43:11277-85. [DOI: 10.1039/c4dt00712c] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A combined computational and experimental study into the mechanism of the anti-Markovnikov hydration of phenylacetylene by a self-assembled ligand complex.
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Affiliation(s)
- Bernhard Breit
- Institut für Organische Chemie & Biochemie
- Albert-Ludwigs-Universität Freiburg
- 79104 Freiburg i. Brsg., Germany
| | - Urs Gellrich
- Institut für Organische Chemie & Biochemie
- Albert-Ludwigs-Universität Freiburg
- 79104 Freiburg i. Brsg., Germany
| | - Timothy Li
- Department of Chemistry
- University of York
- York, UK
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