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Jafari MG, Russell JB, Lee H, Pudasaini B, Pal D, Miao Z, Gau MR, Carroll PJ, Sumerlin BS, Veige AS, Baik MH, Mindiola DJ. Vanadium Alkylidyne Initiated Cyclic Polymer Synthesis: The Importance of a Deprotiovanadacyclobutadiene Moiety. J Am Chem Soc 2024; 146:2997-3009. [PMID: 38272018 DOI: 10.1021/jacs.3c08149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Reported is the catalytic cyclic polymer synthesis by a 3d transition metal complex: a V(V) alkylidyne, [(dBDI)V≡CtBu(OEt2)] (1-OEt2), supported by the deprotonated β-diketiminate dBDI2- (dBDI2- = ArNC(CH3)CHC(CH2)NAr, Ar = 2,6-iPr2C6H3). Complex 1-OEt2 is a precatalyst for the polymerization of phenylacetylene (PhCCH) to give cyclic poly(phenylacetylene) (c-PPA), whereas its precursor, complex [(BDI)V≡CtBu(OTf)] (2-OTf; BDI- = [ArNC(CH3)]2CH, Ar = 2,6-iPr2C6H3, OTf = OSO2CF3), and the zwitterion [((C6F5)3B-dBDI)V≡CtBu(OEt2)] (3-OEt2) exhibit low catalytic activity despite having a neopentylidyne ligand. Cyclic polymer topologies were verified by size-exclusion chromatography (SEC) and intrinsic viscosity studies. A component of the mechanism of the cyclic polymerization reaction was probed by isolation and full characterization of 4- and 6-membered metallacycles as model intermediates. Metallacyclobutadiene (MCBD) and deprotiometallacyclobutadiene (dMCBD) complexes (dBDI)V[C(tBu)C(H)C(tBu)] (4-tBu) and (BDI)V[C(tBu)CC(Mes)] (5-Mes), respectively, were synthesized upon reaction with bulkier alkynes, tBu- (tBuCCH) and Mes-acetylene (MesCCH), with 1-OEt2. Furthermore, the reaction of the conjugate acid of 1-OEt2, [(BDI)V≡CtBu(OTf)] (2-OTf), with the conjugated base of phenylacetylene, lithium phenylacetylide (LiCCPh), yields the doubly deprotio-metallacycle complex, [Li(THF)4]{(BDI)V[C(Ph)CC(tBu)CC(Ph)]} (6). Protonation of the doubly deprotio-metallacycle complex 6 yields 6-H+, a catalytically active species toward the polymerization of PhCCH, for which the polymers were also confirmed to be cyclic by SEC studies. Computational mechanistic studies complement the experimental observations and provide insight into the mechanism of cyclic polymer growth. The noninnocence of the supporting dBDI2- ligand and its role in proton shuttling to generate deprotiometallacyclobutadiene (dMCBD) complexes that proposedly culminate in the formation of catalytically active V(III) species are also discussed. This work demonstrates how a dMCBD moiety can react with terminal alkynes to form cyclic polyalkynes.
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Affiliation(s)
- Mehrafshan G Jafari
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - John B Russell
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Hanna Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Bimal Pudasaini
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Digvijayee Pal
- Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Zhihui Miao
- Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Michael R Gau
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Patrick J Carroll
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Brent S Sumerlin
- Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Adam S Veige
- Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Diversifying the superbase-catalyzed C=N bond ethynylation: triaryl-1-pyrrolines and triaryl-1H-pyrroles from N-benzyl aldimines and arylacetylenes. MENDELEEV COMMUNICATIONS 2023. [DOI: 10.1016/j.mencom.2023.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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3
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Bartholome TA, Martinez JJ, Kaur A, Wilson DJD, Dutton JL, Martin CD. Borataalkene Hydrofunctionalization Reactions. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00261] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tyler A. Bartholome
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Jesse J. Martinez
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Aishvaryadeep Kaur
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - David J. D. Wilson
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Jason L. Dutton
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
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4
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Baeza Cinco MÁ, Hayton TW. Progress toward the Isolation of Late Metal Terminal Sulfides. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000600] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Miguel Á. Baeza Cinco
- Department of Chemistry and Biochemistry University of California Santa Barbara 93106 Santa Barbara CA USA
| | - Trevor W. Hayton
- Department of Chemistry and Biochemistry University of California Santa Barbara 93106 Santa Barbara CA USA
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Donabauer K, Murugesan K, Rozman U, Crespi S, König B. Photocatalytic Reductive Radical-Polar Crossover for a Base-Free Corey-Seebach Reaction. Chemistry 2020; 26:12945-12950. [PMID: 32686166 PMCID: PMC7589390 DOI: 10.1002/chem.202003000] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/15/2020] [Indexed: 01/07/2023]
Abstract
A metal-free generation of carbanion nucleophiles is of prime importance in organic synthesis. Herein we report a photocatalytic approach to the Corey-Seebach reaction. The presented method operates under mild redox-neutral and base-free conditions giving the desired product with high functional group tolerance. The reaction is enabled by the combination of photo- and hydrogen atom transfer (HAT) catalysis. This catalytic merger allows a C-H to carbanion activation by the abstraction of a hydrogen atom followed by radical reduction. The generated nucleophilic intermediate is then capable of adding to carbonyl electrophiles. The obtained dithiane can be easily converted to the valuable α-hydroxy carbonyl in a subsequent step. The proposed reaction mechanism is supported by emission quenching, radical-radical homocoupling and deuterium labeling studies as well as by calculated redox-potentials and bond strengths.
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Affiliation(s)
- Karsten Donabauer
- Department of Organic ChemistryUniversity of RegensburgUniversitätsstraße 3193053RegensburgGermany
| | - Kathiravan Murugesan
- Department of Organic ChemistryUniversity of RegensburgUniversitätsstraße 3193053RegensburgGermany
| | - Urša Rozman
- Department of Organic ChemistryUniversity of RegensburgUniversitätsstraße 3193053RegensburgGermany
| | - Stefano Crespi
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
| | - Burkhard König
- Department of Organic ChemistryUniversity of RegensburgUniversitätsstraße 3193053RegensburgGermany
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Polynski MV, Sapova MD, Ananikov VP. Understanding the solubilization of Ca acetylide with a new computational model for ionic pairs. Chem Sci 2020; 11:13102-13112. [PMID: 34094492 PMCID: PMC8163204 DOI: 10.1039/d0sc04752j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 10/07/2020] [Indexed: 01/05/2023] Open
Abstract
The unique reactivity of the acetylenic unit in DMSO gives rise to ubiquitous synthetic methods. We theoretically consider CaC2 solubility and protolysis in DMSO and formulate a strategy for CaC2 activation in solution-phase chemical transformations. For this, we use a new strategy for the modeling of ionic compounds in strongly coordinating solvents combining Born-Oppenheimer molecular dynamics with the DFTB3-D3(BJ) Hamiltonian and static DFT computations at the PBE0-D3(BJ)/pob-TZVP-gCP level. We modeled the thermodynamics of CaC2 protolysis under ambient conditions, taking into account its known heterogeneity and considering three polymorphs of CaC2. We give a theoretical basis for the existence of the elusive intermediate HC[triple bond, length as m-dash]C-Ca-OH and show that CaC2 insolubility in DMSO is of thermodynamic nature. We confirm the unique role of water and specific properties of DMSO in CaC2 activation and explain how the activation is realized. The proposed strategy for the utilization of CaC2 in sustainable organic synthesis is outlined.
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Affiliation(s)
- Mikhail V Polynski
- Saint Petersburg State University Universitetsky Prospect 26 Saint Petersburg 198504 Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky Prospect 47 Moscow 119991 Russia
| | - Mariia D Sapova
- Saint Petersburg State University Universitetsky Prospect 26 Saint Petersburg 198504 Russia
| | - Valentine P Ananikov
- Saint Petersburg State University Universitetsky Prospect 26 Saint Petersburg 198504 Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky Prospect 47 Moscow 119991 Russia
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7
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Orel VB, Vitkovskaya NM, Absalyamov DZ, Schmidt EY, Trofimov BA. Quantum chemical comparison of ethynylation and C-vinylation routes in superbase catalyzed reaction of acetylenes with imines. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Shahsavari S, Eriyagama DNAM, Halami B, Begoyan V, Tanasova M, Chen J, Fang S. Electrophilic oligodeoxynucleotide synthesis using dM-Dmoc for amino protection. Beilstein J Org Chem 2019; 15:1116-1128. [PMID: 31164948 PMCID: PMC6541367 DOI: 10.3762/bjoc.15.108] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/10/2019] [Indexed: 01/06/2023] Open
Abstract
Solid-phase synthesis of electrophilic oligodeoxynucleotides (ODNs) was achieved using dimethyl-Dmoc (dM-Dmoc) as amino protecting group. Due to the high steric hindrance of the 2-(propan-2-ylidene)-1,3-dithiane side product from deprotection, the use of excess nucleophilic scavengers such as aniline to prevent Michael addition of the side product to the deprotected ODN during ODN cleavage and deprotection was no longer needed. The improved technology was demonstrated by the synthesis and characterization of five ODNs including three modified ones. The modified ODNs contained the electrophilic groups ethyl ester, α-chloroamide, and thioester. Using the technology, the sensitive groups can be installed at any location within the ODN sequences without using any sequence- or functionality-specific conditions and procedures.
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Affiliation(s)
- Shahien Shahsavari
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Dhananjani N A M Eriyagama
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Bhaskar Halami
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Vagarshak Begoyan
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Marina Tanasova
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Jinsen Chen
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Shiyue Fang
- Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
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9
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Pahl J, Stennett TE, Volland M, Guldi DM, Harder S. Complexation and Versatile Reactivity of a Highly Lewis Acidic Cationic Mg Complex with Alkynes and Phosphines. Chemistry 2019; 25:2025-2034. [DOI: 10.1002/chem.201804802] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 10/17/2018] [Indexed: 01/21/2023]
Affiliation(s)
- Jürgen Pahl
- Inorganic and Organometallic Chemistry; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
| | - Tom E. Stennett
- Inorganic and Organometallic Chemistry; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
| | - Michel Volland
- Department of Chemistry and Pharmacy & Interdisciplinary Center for, Molecular Materials (ICMM); Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 3 91058 Erlangen Germany
| | - Dirk M. Guldi
- Department of Chemistry and Pharmacy & Interdisciplinary Center for, Molecular Materials (ICMM); Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 3 91058 Erlangen Germany
| | - Sjoerd Harder
- Inorganic and Organometallic Chemistry; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
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10
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Lemmerz LE, Leich V, Martin D, Spaniol TP, Okuda J. Silyl–Hydrosilane Exchange at a Magnesium Triphenylsilyl Complex Supported by a Cyclen-Derived NNNN-Type Macrocyclic Ligand. Inorg Chem 2017; 56:14979-14990. [DOI: 10.1021/acs.inorgchem.7b02233] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lara E. Lemmerz
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Valeri Leich
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Daniel Martin
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Thomas P. Spaniol
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Jun Okuda
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
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11
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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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Lazreg F, Cazin CSJ. Copper(I)–N-Heterocyclic Carbene Complexes as Efficient Catalysts for the Synthesis of 1,4-Disubstituted 1,2,3-Sulfonyltriazoles in Air. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00506] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Faïma Lazreg
- EastCHEM School of Chemistry, University of St Andrews, St Andrews KY16 9ST, U.K
| | - Catherine S. J. Cazin
- EastCHEM School of Chemistry, University of St Andrews, St Andrews KY16 9ST, U.K
- Department of Chemistry, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium
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Brenna D, Villa M, Gieshoff TN, Fischer F, Hapke M, Jacobi von Wangelin A. Iron-Catalyzed Cyclotrimerization of Terminal Alkynes by Dual Catalyst Activation in the Absence of Reductants. Angew Chem Int Ed Engl 2017; 56:8451-8454. [DOI: 10.1002/anie.201705087] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Davide Brenna
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Matteo Villa
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Tim N. Gieshoff
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Fabian Fischer
- Johannes Kepler University of Linz; Austria
- Leibniz Institute of Catalysis; Rostock Germany
| | - Marko Hapke
- Johannes Kepler University of Linz; Austria
- Leibniz Institute of Catalysis; Rostock Germany
| | - Axel Jacobi von Wangelin
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
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Brenna D, Villa M, Gieshoff TN, Fischer F, Hapke M, Jacobi von Wangelin A. Iron-Catalyzed Cyclotrimerization of Terminal Alkynes by Dual Catalyst Activation in the Absence of Reductants. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705087] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Davide Brenna
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Matteo Villa
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Tim N. Gieshoff
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Fabian Fischer
- Johannes Kepler University of Linz; Austria
- Leibniz Institute of Catalysis; Rostock Germany
| | - Marko Hapke
- Johannes Kepler University of Linz; Austria
- Leibniz Institute of Catalysis; Rostock Germany
| | - Axel Jacobi von Wangelin
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
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15
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Bujok R, Mąkosza M. Direct synthesis of nitroaryl acetylenes from acetylenes and nitroarenes via oxidative nucleophilic substitution of hydrogen. Chem Commun (Camb) 2016; 52:12650-12652. [PMID: 27713937 DOI: 10.1039/c6cc07475h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Acetylenic carbanions add to nitroarenes (dinitrobenzenes, nitropyridines, etc.) to form σH-adducts that are subsequently oxidized by DDQ according to the oxidative nucleophilic substitution of hydrogen (ONSH) pathway to give nitroaryl acetylenes.
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Affiliation(s)
- Robert Bujok
- Institute of Organic Chemistry Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Mieczysław Mąkosza
- Institute of Organic Chemistry Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland.
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Kondoh A, Oishi M, Takeda T, Terada M. Enantioselective Addition of a 2‐Alkoxycarbonyl‐1,3‐dithiane to Imines Catalyzed by a Bis(guanidino)iminophosphorane Organosuperbase. Angew Chem Int Ed Engl 2015; 54:15836-9. [DOI: 10.1002/anie.201508178] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Masafumi Oishi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Tadahiro Takeda
- Process Technology Research Laboratories, Daiichi Sankyo Co., Ltd, Edogawa‐ku, Tokyo 134‐8630 (Japan)
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
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17
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Kondoh A, Oishi M, Takeda T, Terada M. Enantioselective Addition of a 2‐Alkoxycarbonyl‐1,3‐dithiane to Imines Catalyzed by a Bis(guanidino)iminophosphorane Organosuperbase. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508178] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Masafumi Oishi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Tadahiro Takeda
- Process Technology Research Laboratories, Daiichi Sankyo Co., Ltd, Edogawa‐ku, Tokyo 134‐8630 (Japan)
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
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Kefalidis CE, Perrin L, Burns CJ, Berg DJ, Maron L, Andersen RA. Can a pentamethylcyclopentadienyl ligand act as a proton-relay in f-element chemistry? Insights from a joint experimental/theoretical study. Dalton Trans 2015; 44:2575-87. [PMID: 25340677 DOI: 10.1039/c4dt02387k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Isomerisation of buta-1,2-diene to but-2-yne by (Me(5)C(5))(2)Yb is a thermodynamically favourable reaction, with the Δ(r)G° estimated from experimental data at 298 K to be -3.0 kcal mol(-1). It proceeds in hydrocarbon solvents with a pseudo first-order rate constant of 6.4 × 10(-6) s(-1) and 7.4 × 10(-5) s(-1) in C(6)D(12) and C(6)D(6), respectively, at 20 °C. This 1,3-hydrogen shift is formally forbidden by symmetry and has to occur by an alternative pathway. The proposed mechanism for buta-1,2-diene to but-2-yne isomerisation by (Me(5)C(5))(2)Yb involves coordination of methylallene (buta-1,2-diene) to (Me(5)C(5))(2)Yb, and deprotonation of methylallene by one of the Me(5)C(5) ligands followed by protonation of the terminal methylallenyl carbon to yield the known coordination compound (Me(5)C(5))(2)Yb(η(2)-MeC[triple bond, length as m-dash]CMe). Computationally, this mechanism is not initiated by a single electron transfer step, and the ytterbium retains its oxidation state (II) throughout the reactivity. Experimentally, the influence of the metal centre is discussed by comparison with the reaction of (Me(5)C(5))(2)Ca towards buta-1,2-diene, and (Me(5)C(5))(2)Yb with ethylene. The mechanism by which the Me(5)C(5) acts as a proton-relay within the coordination sphere of a metal also rationalises the reactivity of (i) (Me(5)C(5))(2)Eu(OEt(2)) with phenylacetylene, (ii) (Me(5)C(5))(2)Yb(OEt(2)) with phenylphosphine and (iii) (Me(5)C(5))(2)U(NPh)(2) with H(2) to yield (Me(5)C(5))(2)U(HNPh)(2). In the latter case, the computed mechanism is the heterolytic activation of H(2) by (Me(5)C(5))(2)U(NPh)(2) to yield (Me(5)C(5))(2)U(H)(HNPh)(NPh), followed by a hydrogen transfer from uranium back to the imido nitrogen atom using one Me(5)C(5) ligand as a proton-relay. The overall mechanism by which hydrogen shifts using a pentamethylcyclopentadienyl ligand as a proton-relay is named Carambole in reference to carom billiards.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France.
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Arnold PL, Cadenbach T, Marr IH, Fyfe AA, Bell NL, Bellabarba R, Tooze RP, Love JB. Homo- and heteroleptic alkoxycarbene f-element complexes and their reactivity towards acidic N-H and C-H bonds. Dalton Trans 2015; 43:14346-58. [PMID: 24920060 DOI: 10.1039/c4dt01442a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The reactivity of a series of organometallic rare earth and actinide complexes with hemilabile NHC-ligands towards substrates with acidic C-H and N-H bonds is described. The synthesis, characterisation and X-ray structures of the new heteroleptic mono- and bis(NHC) cyclopentadienyl complexes LnCp2(L) 1 (Ln = Sc, Y, Ce; L = alkoxy-tethered carbene [OCMe2CH2(1-C{NCHCHN(i)Pr})]), LnCp(L)2 (Ln = Y) , and the homoleptic tetrakis(NHC) complex Th(L)4 4 are described. The reactivity of these complexes, and of the homoleptic complexes Ln(L)3 (Ln = Sc 3, Ce), with E-H substrates is described, where EH = pyrrole C4H4NH, indole C8H6NH, diphenylacetone Ph2CC(O)Me, terminal alkynes RC≡CH (R = Me3Si, Ph), and cyclopentadiene C5H6. Complex 1-Y heterolytically cleaves and adds pyrrole and indole N-H across the metal carbene bond, whereas 1-Ce does not, although 3 and 4 form H-bonded adducts. Complexes 1-Y and 1-Sc form adducts with CpH without cleaving the acidic C-H bond, 1-Ce cleaves the Cp-H bond, but 2 reacts to form the very rare H(+)-[C5H5](-)-H(+) motif. Complex 1-Ce cleaves alkyne C-H bonds but the products rearrange upon formation, while complex 1-Y cleaves the C-H bond in diphenylacetone forming a product which rearranges to the Y-O bonded enolate product.
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Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3JJ, UK.
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Weingand D, Kiefer C, Podlech J. Conformationally constrained 2-methylidene 1,3-oxathiane S-oxides: synthesis and nucleophilic additions. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Süveges BD, Podlech J. Dependence of Stereoelectronic and Charge Effects on pKaValues of 1,3-Dithiane-Derived Sulfides, Sulfoxides, and Sulfones: An Experimental and Computational Investigation. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403409] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Perez F, Ren Y, Boddaert T, Rodriguez J, Coquerel Y. A Stable N-Heterocyclic Carbene Organocatalyst for Hydrogen/Deuterium Exchange Reactions between Pseudoacids and Deuterated Chloroform. J Org Chem 2014; 80:1092-7. [DOI: 10.1021/jo502578x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Fabien Perez
- Aix Marseille Université, Centrale Marseille,
CNRS, iSm2 UMR 7313, 13397 Marseille, France
| | - Yajun Ren
- Aix Marseille Université, Centrale Marseille,
CNRS, iSm2 UMR 7313, 13397 Marseille, France
| | - Thomas Boddaert
- Aix Marseille Université, Centrale Marseille,
CNRS, iSm2 UMR 7313, 13397 Marseille, France
| | - Jean Rodriguez
- Aix Marseille Université, Centrale Marseille,
CNRS, iSm2 UMR 7313, 13397 Marseille, France
| | - Yoann Coquerel
- Aix Marseille Université, Centrale Marseille,
CNRS, iSm2 UMR 7313, 13397 Marseille, France
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23
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Yu HZ, Yang YM, Zhang L, Dang ZM, Hu GH. Quantum-Chemical Predictions of pKa’s of Thiols in DMSO. J Phys Chem A 2014; 118:606-22. [DOI: 10.1021/jp410274n] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Hai-Zhu Yu
- Department
of Polymer Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yi-Meng Yang
- Department
of Polymer Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Liang Zhang
- Department
of Polymer Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Zhi-Min Dang
- Department
of Polymer Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Guo-Hua Hu
- Laboratory of Reactions and Process Engineering (CNRS UMR 7274), CNRS-Université de Lorraine , ENSIC, 1 rue Grandville, BP 20451, 54001 Nancy, France
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24
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Kim JH, Chun YS, Lee SG. Tandem Blaise/retro-Blaise Reaction for the Nitrile-Mediated Regioselective Intermolecular Addition of Unstabilized Zinc Ester Enolates (Reformatsky Reagents) to 1-Alkynes and 1,3-Enynes. J Org Chem 2013; 78:11483-93. [DOI: 10.1021/jo402015n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ju Hyun Kim
- Department of Chemistry and Nano Science, Ewha Womans University , 120-750 Seoul, Korea
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Lewis AJ, Carroll PJ, Schelter EJ. Stable Uranium(VI) Methyl and Acetylide Complexes and the Elucidation of an Inverse Trans Influence Ligand Series. J Am Chem Soc 2013; 135:13185-92. [DOI: 10.1021/ja406610r] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Andrew J. Lewis
- P. Roy and Diana T. Vagelos Laboratories,
Department
of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United
States
| | - Patrick J. Carroll
- P. Roy and Diana T. Vagelos Laboratories,
Department
of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United
States
| | - Eric J. Schelter
- P. Roy and Diana T. Vagelos Laboratories,
Department
of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United
States
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26
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Hellmann G, Hack A, Thiemermann E, Luche O, Raabe G, Gais HJ. Chiral Fluorinated α-Sulfonyl Carbanions: Enantioselective Synthesis and Electrophilic Capture, Racemization Dynamics, and Structure. Chemistry 2013; 19:3869-97. [DOI: 10.1002/chem.201204014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Indexed: 11/06/2022]
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Trost BM, Bartlett MJ, Weiss AH, von Wangelin AJ, Chan VS. Development of Zn-ProPhenol-catalyzed asymmetric alkyne addition: synthesis of chiral propargylic alcohols. Chemistry 2012; 18:16498-509. [PMID: 23097281 PMCID: PMC3864595 DOI: 10.1002/chem.201202085] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 08/29/2012] [Indexed: 11/07/2022]
Abstract
The development of a general and practical zinc-catalyzed enantioselective alkyne addition methodology is reported. The commercially available ProPhenol ligand (1) has facilitated the addition of a wide range of zinc alkynylides to aryl, aliphatic, and α,β-unsaturated aldehydes in high yield and enantioselectivity. New insights into the mechanism of this reaction have resulted in a significant reduction in reagent stoichiometry, enabling the use of precious alkynes and avoiding the use of excess dimethylzinc. The enantioenriched propargylic alcohols from this reaction serve as versatile synthetic intermediates and have enabled efficient syntheses of several complex natural products.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
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Ji P, Powles NT, Atherton JH, Page MI. Ionization of Carbon Acids in Liquid Ammonia. Org Lett 2011; 13:6118-21. [DOI: 10.1021/ol2026153] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pengju Ji
- IPOS, The Page Laboratories, Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - Nicholas T. Powles
- IPOS, The Page Laboratories, Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - John H. Atherton
- IPOS, The Page Laboratories, Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
| | - Michael I. Page
- IPOS, The Page Laboratories, Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, United Kingdom
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Streitwieser A, Reyes JR, Singhapricha T, Vu S, Shah K. Ab initio modeling of organolithium equilibria. J Org Chem 2010; 75:3821-30. [PMID: 20465266 DOI: 10.1021/jo100864y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Experimental ion pair pK's of monomeric contact ion pair lithium salts in THF from our previous studies give good correlations with ab initio calculations at the Hartree-Fock 6-31+g(d) level. PCM methods were found to be inadequate in nonpolar organic solvents, and dielectric solvation was not used in the correlations. Specific coordination of two or three ether solvent molecules with lithium was found to be satisfactory. These correlations include carboxamides, amines, dithianes, sulfones, and sulfoxides, as well as some ketones, beta-diketones, and the lithium salts of dianions.
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Affiliation(s)
- Andrew Streitwieser
- Department of Chemistry, University of California-Berkeley, Berkeley, California 94720-1460, USA.
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30
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Fortman GC, Poater A, Levell JW, Gaillard S, Slawin AMZ, Samuel IDW, Cavallo L, Nolan SP. A versatile gold synthon for acetylene C–H bond activation. Dalton Trans 2010; 39:10382-90. [DOI: 10.1039/c0dt00276c] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Trofimov BA, Schmidt EY, Ushakov IA, Mikhaleva AI, Zorina NV, Protsuk NI, Senotrusova EY, Skital'tseva EV, Kazheva ON, Alexandrov GG, Dyachenko OA. One-Pot Assembly of 7-Methylene-6,8-dioxabicyclo[3.2.1]octanes, Congeners of Frontalin, from Ketones and Acetylene. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900853] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sakakibara K, Nozaki K. Ring-opening reaction of Bus- and SES-protected aziridines using lithiated dithianes. Org Biomol Chem 2009; 7:502-7. [DOI: 10.1039/b814413c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Synthesis and characterization of [chloro{2(1H)-pyridinethione-S}{tris(pyridin-2-ylthiolato)methyl-C,N,N′,N″]}nickel(II)], [Ni(TPTM)(SPyH)Cl]. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.02.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mchedlov-Petrossyan NO, Kukhtik VI, Bezugliy VD. Dissociation, tautomerism and electroreduction of xanthene and sulfonephthalein dyes inN,N-dimethylformamide and other solvents. J PHYS ORG CHEM 2003. [DOI: 10.1002/poc.654] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Allegretti PE, Milazzo CB, Castro EA, Furlong JJ. Mass spectrometry as a valuable tool for the study of tautomerism of amides and thioamides. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00258-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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36
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Motoyoshiya J, Inoue H, Takaguchi Y, Aoyama H. Autoxidation of acridanyl and benzhydryl carbanions adjacent to sulfur groups leading to C?S bond cleavage with weak chemiluminescence. HETEROATOM CHEMISTRY 2002. [DOI: 10.1002/hc.10025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Allegretti P, Castro E, Furlong J. Tautomeric equilibrium of amides and related compounds: theoretical and spectral evidences. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(99)00294-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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39
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Yoshizawa K, Yahara K, Taniguchi A, Yamabe T, Kinoshita T, Takeuchi K. Orbital Interactions and Solvent Effects Determining the Stability of Condensed Cyclopentadienides in Solution. J Org Chem 1999; 64:2821-2829. [PMID: 11674351 DOI: 10.1021/jo982286k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structure and the stability of various cyclopentadienides, which involve 6pi, 10pi, 14pi, and 22pi electrons, are investigated from computations at various levels of theory as well as from orbital interaction analyses. The reason that some of the cyclopentadienides are stabilized and others are destabilized by the introduction of aromatic rings is discussed in terms of absolute hardness and orbital interaction. Cyclopentadienide, a special 6pi-electron system, has the largest value of absolute hardness among the condensed cyclopentadienides investigated; thus this carbanion resists both oxidation and reduction most strongly. The absolute hardness decreases when aromatic rings are introduced to cyclopentadienide to form condensed cyclopentadienides, depending on the way they are connected. Computed values of the ionization potential and oxidation potentials measured in solution have a linear correlation within isomers of the same size, but are not in agreement for different sets of isomers. Solvent effects on the ionization potential are assessed by performing self-consistent reaction field calculations, the results being in excellent agreement with experiments. It is demonstrated that the solvent effects are significant in small cyclopentadienides of 6pi- and 10pi-electron systems, compared to larger ones and that addition of condensed aromatic rings intrinsically stabilizes the formed condensed cyclopentadienides with respect to ionization potential.
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Affiliation(s)
- Kazunari Yoshizawa
- Department of Molecular Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan, Institute for Fundamental Chemistry, 34-4 Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan, and Department of Energy and Hydrocarbon Chemistry, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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Bordwell FG, Liu WZ. Effects of sulfenyl, sulfinyl and sulfonyl groups on acidities and homolytic bond dissociation energies of adjacent C?H and N?H bonds. J PHYS ORG CHEM 1998. [DOI: 10.1002/(sici)1099-1395(199806)11:6<397::aid-poc10>3.0.co;2-b] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Kinoshita T, Fujita M, Kaneko H, Takeuchi K, Yoshizawa K, Yamabe T. Hydrocarbon Anions with High Stability. Part 2. Structure and Stability of Cyclopentadienide Ions with Condensed Aromatic Rings. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1998. [DOI: 10.1246/bcsj.71.1145] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Oki M, Ikeda H, Kodama K, Toyota S. Effects of Solvent Molecular Size on Rates of Topomerization in Organolithium Compounds. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1997. [DOI: 10.1246/bcsj.70.2791] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Stoelting DT, Ludwig RT, Arnett EM. 2-aryl-1,3-dithianes and -dithiolanes: A nearly ideal series for relating the energies for bond breaking to electron transfer. HETEROATOM CHEMISTRY 1996. [DOI: 10.1002/(sici)1098-1071(199611)7:6<481::aid-hc11>3.0.co;2-m] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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45
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