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Manca L, Senzacqua G, Stoccoro S, Zucca A. Regioselective C(sp 2)-C(sp 3) Coupling Mediated by Classical and Rollover Cyclometalation. Molecules 2024; 29:707. [PMID: 38338451 PMCID: PMC10856536 DOI: 10.3390/molecules29030707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 01/26/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024] Open
Abstract
By taking advantage of a sequence of oxidative addition/reductive elimination reactions, Pt(II) cyclometalated derivatives are able to promote a rare C(sp2)-C(sp3) bond coupling, resulting in the production of novel methyl-substituted pyridines and bipyridines. Starting from 6-phenyl-2,2'-bipyridine, the step-by-step full sequence of reactions has been followed, leading to the unprecedented 3-methyl-6-phenyl-2,2'-bipyridine, which was isolated and fully characterized. The synthesis involves the following steps: (1) rollover cyclometalation to give the starting complex [Pt(N^C)(DMSO)Me]; (2) the synthesis of a more electron-rich complex [Pt(N^C)(PPh3)Me] by the substitution of DMSO with triphenylphosphine; (3) oxidative addition with methyl iodide to give the Pt(IV) complex [Pt(N^C)(PPh3)(Me)2(I)]; (4) iodide abstraction with silver tetrafluoborate to give an unstable pentacoordinate intermediate, which rapidly evolves through a carbon-carbon reductive coupling, forming a new C(sp3)-C(sp2) bond; (5) finally, the extrusion and characterization of the newly formed 3-methyl-6-phenyl-2,2'-bipyridine. The reaction has been therefore extended to a well-known classical cyclometalating ligand, 2-phenylpyridine, demonstrating that the method is not restricted to rollover derivatives. Following the same step-by-step procedure, 2-phenylpyridine was converted to 2-o-tolyl-pyridine, displaying the potential application of the method to the larger family of classical cyclometalated complexes. The application of this protocol may be useful to convert an array of heterocyclic compounds to their methyl- or alkyl-substituted analogs.
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Affiliation(s)
- Lorenzo Manca
- Dipartimento di Scienze Chimiche, Fisiche, Matematiche e Naturali, Università degli Studi di Sassari, Via Vienna 2, 07100 Sassari, Italy; (L.M.); (G.S.); (S.S.)
| | - Giacomo Senzacqua
- Dipartimento di Scienze Chimiche, Fisiche, Matematiche e Naturali, Università degli Studi di Sassari, Via Vienna 2, 07100 Sassari, Italy; (L.M.); (G.S.); (S.S.)
- Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), Villa La Rocca, Via Celso Ulpiani, 27, 70126 Bari, Italy
| | - Sergio Stoccoro
- Dipartimento di Scienze Chimiche, Fisiche, Matematiche e Naturali, Università degli Studi di Sassari, Via Vienna 2, 07100 Sassari, Italy; (L.M.); (G.S.); (S.S.)
- Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), Villa La Rocca, Via Celso Ulpiani, 27, 70126 Bari, Italy
| | - Antonio Zucca
- Dipartimento di Scienze Chimiche, Fisiche, Matematiche e Naturali, Università degli Studi di Sassari, Via Vienna 2, 07100 Sassari, Italy; (L.M.); (G.S.); (S.S.)
- Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), Villa La Rocca, Via Celso Ulpiani, 27, 70126 Bari, Italy
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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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3
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Noori M, Shafaatian B, Notash B. New organoplatinum complexes containing di-2-pyridyl ketone; single crystal structure determination, solvatochromism and kinetic investigations. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Goldberg JM, Guard LM, Wong GW, Brayton DF, Kaminsky W, Goldberg KI, Heinekey DM. Preparation and Reactivity of Bimetallic (pincer)Ir Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00403] [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)
- Jonathan M. Goldberg
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Louise M. Guard
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Gene W. Wong
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Daniel F. Brayton
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Werner Kaminsky
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Karen I. Goldberg
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - D. Michael Heinekey
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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5
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The history of organoplatinum chemistry in Iran: 40-year research. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2020. [DOI: 10.1007/s13738-020-01892-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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6
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Nabavizadeh SM, Raoof F, Pakpour F, Shafiei Sarvestani L, Niknam F, Niroomand Hosseini F, Hoseini SJ. Facile activation of the C–I bond of primary alkyl halides by Pt(II) complexes having a benzothiazole ligand. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119535] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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7
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Sandford C, Fries LR, Ball TE, Minteer SD, Sigman MS. Mechanistic Studies into the Oxidative Addition of Co(I) Complexes: Combining Electroanalytical Techniques with Parameterization. J Am Chem Soc 2019; 141:18877-18889. [DOI: 10.1021/jacs.9b10771] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Christopher Sandford
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Lydia R. Fries
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Tyler E. Ball
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Shelley D. Minteer
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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8
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Fatemeh NH, Farasat Z, Nabavizadeh SM, Wu G, Abu-Omar MM. N-methylation versus oxidative addition using MeI in the reaction of organoplatinum(II) complexes containing pyrazine ligand. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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9
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Shahsavari HR, Babadi Aghakhanpour R, Fereidoonnezhad M. An in-depth investigation on the C–I bond activation by rollover cycloplatinated(ii) complexes bearing monodentate phosphane ligands: kinetic and kinetic isotope effect. NEW J CHEM 2018. [DOI: 10.1039/c7nj04159d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidative addition reaction of MeI reagent to some cycloplatinated(ii) complexes was performed and kinetically investigated.
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Affiliation(s)
- Hamid R. Shahsavari
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
| | | | - Masood Fereidoonnezhad
- Department of Medicinal Chemistry
- School of Pharmacy
- Toxicology Research Center
- Ahvaz Jundishapur University of Medical Sciences
- Ahvaz
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10
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Shahsavari HR, Babadi Aghakhanpour R, Babaghasabha M, Golbon Haghighi M, Nabavizadeh SM, Notash B. Combined Kinetico‐Mechanistic and Theoretical Elucidation of the Oxidative Addition of Iodomethane to Cycloplatinated(II) Complexes: Controlling the Rate of
trans/cis
Isomerization. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hamid R. Shahsavari
- Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS) Yousef Sobouti Blvd. 45137‐6731 Zanjan Iran
| | - Reza Babadi Aghakhanpour
- Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS) Yousef Sobouti Blvd. 45137‐6731 Zanjan Iran
- Department of Chemistry College of Sciences Shiraz University 71454 Shiraz Iran
| | - Mojgan Babaghasabha
- Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS) Yousef Sobouti Blvd. 45137‐6731 Zanjan Iran
| | | | | | - Behrouz Notash
- Department of Chemistry Shahid Beheshti University Evin 19839‐69411 Tehran Iran
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11
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Thompson KA, Kadwell C, Boyle PD, Puddephatt RJ. Reactivity of organoplatinum complexes containing appended alcohol functional groups: Activation of dioxygen and hydrogen peroxide. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.11.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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12
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Niroomand Hosseini F, Rashidi M, Nabavizadeh SM. Synthesis of diorganoplatinum(IV) complexes by the S S bond cleavage with platinum(II) complexes. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.06.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Stace JJ, Ball P, Shingade V, Chatterjee S, Shiveley A, Fleeman WL, Staniszewski AJ, Krause JA, Connick WB. Kinetics of the methylation of a platinum(II) diimine dithiolate complex. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Niroomand Hosseini F. Theoretical studies of methyl iodide oxidative addition to adjacent metal centers in diplatinum(II) complexes. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.07.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Secondary kinetic deuterium isotope effect in oxidative addition reaction of cycloplatinated(II) complexes with MeI. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.06.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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A kinetic approach to carbon–iodide bond activation by rollover cycloplatinated(II) complexes containing monodentate phosphine ligands. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Hoseini SJ, Nasrabadi H, Rashidi M. Substitution and Organohalide Oxidative Addition Reactions Involving a Dimethylplatinum(II) Complex in a Micelle Medium. Organometallics 2015. [DOI: 10.1021/om501081z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- S. Jafar Hoseini
- Department of Chemistry,
Faculty of Sciences, Yasouj University, Yasouj 7591874831, Iran
| | - Hasan Nasrabadi
- Department of Chemistry,
Faculty of Sciences, Yasouj University, Yasouj 7591874831, Iran
| | - Mehdi Rashidi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran
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18
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Aghakhanpour RB, Rashidi M, Hosseini FN, Raoof F, Nabavizadeh SM. Oxidation of a rollover cycloplatinated(ii) dimer by MeI: a kinetic study. RSC Adv 2015. [DOI: 10.1039/c5ra12201e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The known rollover cycloplatinated(ii) complex [Pt2Me2(PPh3)2(μ-bpy-2H)], 1, in which bpy-2H acts as a bridging rollover ligand, reacts with MeI to give a new binuclear rollover cycloplatinated(iv) complex [Pt2Me4I2(PPh3)2(μ-bpy-2H)], 2.
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Affiliation(s)
| | - Mehdi Rashidi
- Department of Chemistry
- College of Sciences
- Shiraz University
- Shiraz
- Iran
| | | | - Fatemeh Raoof
- Department of Chemistry
- College of Sciences
- Shiraz University
- Shiraz
- Iran
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19
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Kinetico-mechanistic studies on CX (X=H, F, Cl, Br, I) bond activation reactions on organoplatinum(II) complexes. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.06.010] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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20
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Hoseini SJ, Nasrabadi H, Hashemi Fath R, Moradi Z, Rashidi M. Oxidative Addition of Propargyl Halides, Chloroacetonitrile, and Ethyl Chloroacetate to a Dimethylplatinum(II) Complex: Kinetic and DFT Studies. Organometallics 2014. [DOI: 10.1021/om500022r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- S. Jafar Hoseini
- Department of Chemistry, Faculty of Sciences, Yasouj University, Yasouj 7591874831, Iran
| | - Hasan Nasrabadi
- Department of Chemistry, Faculty of Sciences, Yasouj University, Yasouj 7591874831, Iran
| | - Roghayeh Hashemi Fath
- Department of Chemistry, Faculty of Sciences, Yasouj University, Yasouj 7591874831, Iran
| | - Zohreh Moradi
- Department of Chemistry, Faculty of Sciences, Yasouj University, Yasouj 7591874831, Iran
| | - Mehdi Rashidi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran
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21
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Scheller S, Goenrich M, Thauer RK, Jaun B. Methyl-Coenzyme M Reductase from Methanogenic Archaea: Isotope Effects on the Formation and Anaerobic Oxidation of Methane. J Am Chem Soc 2013; 135:14975-84. [DOI: 10.1021/ja406485z] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Silvan Scheller
- Laboratory
of Organic Chemistry, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Meike Goenrich
- Max Planck Institute for Terrestrial Microbiology, Karl-Von-Frisch-Strasse 10, 35043 Marburg, Germany
| | - Rudolf K. Thauer
- Max Planck Institute for Terrestrial Microbiology, Karl-Von-Frisch-Strasse 10, 35043 Marburg, Germany
| | - Bernhard Jaun
- Laboratory
of Organic Chemistry, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
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22
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Hosseini FN, Nabavizadeh SM. Application of variable-temperature kinetic experiments to oxidative addition reactions of dimethylplatinum(II) complexes with alkyl halides. TRANSIT METAL CHEM 2013. [DOI: 10.1007/s11243-013-9739-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Aseman MD, Rashidi M, Nabavizadeh SM, Puddephatt RJ. Secondary Kinetic Isotope Effects in Oxidative Addition of Benzyl Bromide to Dimethylplatinum(II) Complexes. Organometallics 2013. [DOI: 10.1021/om400084b] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
| | - Mehdi Rashidi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran
| | | | - Richard J. Puddephatt
- Department
of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
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24
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Sylvester KT, Wu K, Doyle AG. Mechanistic investigation of the nickel-catalyzed Suzuki reaction of N,O-acetals: evidence for boronic acid assisted oxidative addition and an iminium activation pathway. J Am Chem Soc 2012; 134:16967-16970. [PMID: 23030789 PMCID: PMC4807852 DOI: 10.1021/ja3079362] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mechanism of a recently reported Suzuki coupling reaction of quinoline-derived allylic N,O-acetals has been studied using a combination of structural, stereochemical, and kinetic isotope effect experiments. The data indicate that C-O activation is facilitated by Lewis acid assistance from the boronic acid coupling partner and an ionic S(N)1-like mechanism accounts for oxidative addition. In this context, we demonstrate the first direct observation of oxidative addition to a quinolinium salt. Notably, this mechanism is distinct from the more commonly described S(N)2(')-type oxidative addition of low-valent transition metals to most allylic electrophiles.
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Hoseini SJ, Nasrabadi H, Nabavizadeh SM, Rashidi M, Puddephatt RJ. Reactivity and Mechanism in the Oxidative Addition of Allylic Halides to a Dimethylplatinum(II) Complex. Organometallics 2012. [DOI: 10.1021/om201289e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- S. Jafar Hoseini
- Department of Chemistry, Faculty
of Sciences, Yasouj University, Yasouj,
Iran
| | - Hasan Nasrabadi
- Department of Chemistry, Faculty
of Sciences, Yasouj University, Yasouj,
Iran
| | | | - Mehdi Rashidi
- Department of Chemistry,
Faculty
of Sciences, Shiraz University, Shiraz
71454, Iran
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27
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Nabavizadeh SM, Amini H, Jame F, Khosraviolya S, Shahsavari HR, Niroomand Hosseini F, Rashidi M. Oxidative addition of MeI to some cyclometalated organoplatinum(II) complexes: Kinetics and mechanism. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2011.10.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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28
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Nabavizadeh SM, Sepehrpour H, Shahsavari HR, Rashidi M. Influence of anionic components of ionic liquid solvents on oxidative addition reactions of organoplatinum(ii) complexes with MeI. NEW J CHEM 2012. [DOI: 10.1039/c2nj40155j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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29
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Substitution reactions involving cyclometalated platinum(II) complexes: Kinetic investigations. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.08.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Density functional studies of influences of Ni triad metals and solvents on oxidative addition of MeI to [M(CH3)2(NH3)2] complexes and C–C reductive elimination from [M(CH3)3(NH3)2I] complexes. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.07.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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31
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Nabavizadeh SM, Habibzadeh S, Rashidi M, Puddephatt RJ. Oxidative Addition of Ethyl Iodide to a Dimethylplatinum(II) Complex: Unusually Large Kinetic Isotope Effects and Their Transition-State Implications. Organometallics 2010. [DOI: 10.1021/om100810t] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Sepideh Habibzadeh
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran
| | - Mehdi Rashidi
- Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran
- Department of Chemistry, University of Western Ontario, London, Canada N6A 5B7
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32
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Nabavizadeh SM, Shahsavari HR, Sepehrpour H, Hosseini FN, Jamali S, Rashidi M. Oxidative addition reaction of diarylplatinum(II) complexes with MeI in ionic liquid media: a kinetic study. Dalton Trans 2010; 39:7800-5. [PMID: 20664857 DOI: 10.1039/c0dt00282h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A kinetic study of the oxidative addition reaction of diarylplatinum(II) complexes [Pt(p-MeC(6)H(4))(2)(NN)] (1a: NN = 1,10-phenanthroline (phen) and 1b: NN = 4,4'-di-tert-butyl-2,2'-bipyridine ((t)Bu(2)bpy)) with MeI in ionic liquids 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([bmim][bta]) or 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF(4)]) is described. The reactions were investigated as a function of MeI concentration and temperature under pseudo-first-order conditions using UV-vis spectroscopy techniques. In general, the oxidative addition reactions in ionic liquids followed an S(N)2 mechanism, similar to that reported for the related reactions in conventional solvents, e.g. benzene or acetone. The reaction rates in different solvents followed the order acetone > ionic liquids > benzene. The trend in the values of k(2) clearly indicated that ionic liquids behave like conventional solvents and that no particular 'ionic liquid effect' was detected in this kind of reaction. The effect of solvent on the reactions was examined using a linear solvation energy relationship (LSER) based on the Kamlet-Taft solvent scale. The activation parameters, DeltaH(++) and DeltaS(++), were obtained for the reactions in each solvent and the investigation of enthalpy-entropy compensation confirmed that the mechanism operated in all solvents is similar.
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Affiliation(s)
- S Masoud Nabavizadeh
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, 71454, Iran.
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