1
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Ma Y. Computational Research on Ag(I)-Catalyzed Cubane Rearrangement: Mechanism, Metal and Counteranion Effect, Ligand Engineering, and Post-Transition-State Desymmetrization. J Org Chem 2024; 89:3430-3440. [PMID: 38375633 DOI: 10.1021/acs.joc.3c02891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
Ag(I) salts have demonstrated superior catalytic activity in the cubane-cuneane rearrangement. This research presents a comprehensive mechanistic investigation using high-level computations. The reaction proceeds via oxidative addition (OA) of Ag(I) to the C-C bond, followed by C-Ag bond cleavage and subsequent dynamically concerted carbocation rearrangement. The OA of Ag(I) exhibits significant more electrophilic nature than classical transition metal-induced OA, and the superior catalytic activity of Ag(I) is attributed to the accessibility of a highly electrophilic "bare" Ag+ center and a relatively weak Ag-C bond. However, the highly Lewis acidic nature of the Ag(I) center limits the substrate scope. To address this problem, ligand and counteranion screening was conducted, revealing that chiral biarylether ligands in combination with BF4- as the counteranion offer both enhanced reactivity and improved chemoselectivity while suppressing the Lewis acidity. Additionally, quasi-classical molecular dynamics simulations indicate the possibility of a novel desymmetrization pathway through post-transition-state dynamics in the biarylether-Ag(I)-BF4- system, thereby providing a potential avenue for enantioselective cuneane synthesis.
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Affiliation(s)
- Yumiao Ma
- BSJ Institute, Haidian, Beijing 100084, People's Republic of China
- Hangzhou Yanqu Information Technology Co., Ltd., Xihu District, Hangzhou City, Zhejiang Province 310003, People's Republic of China
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2
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Fujiwara K, Nagasawa S, Maeyama R, Segawa R, Hirasawa N, Hirokawa T, Iwabuchi Y. Biological Evaluation of Isosteric Applicability of 1,3-Substituted Cuneanes as m-Substituted Benzenes Enabled by Selective Isomerization of 1,4-Substituted Cubanes. Chemistry 2024; 30:e202303548. [PMID: 38012076 DOI: 10.1002/chem.202303548] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/24/2023] [Accepted: 11/27/2023] [Indexed: 11/29/2023]
Abstract
We herein evaluate a biological applicability of 1,3-substituted cuneanes as an isostere of m-substituted benzenes based on its structural similarity. An investigation of a method to obtain 1,3-substituted cuneanes by selective isomerization of 1,4-substituted cubanes enables this attempt by giving a key synthetic step to obtain a cuneane analogs of pharmaceuticals having m-substituted benzene moiety. Biological evaluation of the synthesized analogs and in silico study of the obtained result revealed a potential usage of cuneane skeleton in medicinal chemistry.
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Affiliation(s)
- Kan Fujiwara
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, Japan
| | - Shota Nagasawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, Japan
| | - Ryusei Maeyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, Japan
| | - Ryosuke Segawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, Japan
| | - Noriyasu Hirasawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, Japan
| | - Takatsugu Hirokawa
- Division of Biomedical Science, Faculty of Medicine, University of Tsukuba
- Transborder Medical Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
| | - Yoshiharu Iwabuchi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, Japan
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3
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Yue X, Zhou Q, Houk KN. Computational Exploration of the Thermal Rearrangement of Basketene: One Forbidden versus Two Allowed Pericyclic Reactions. J Org Chem 2023; 88:14303-14307. [PMID: 37768874 DOI: 10.1021/acs.joc.3c00993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
The thermal rearrangement of basketene to Nenitzescu's hydrocarbon has been explored using density functional theory (M06-2X and ωB97X-D) and DLPNO-CCSD(T) quantum mechanics. Both the sequential thermally allowed retro Diels-Alder followed by Cope rearrangement and the thermally forbidden retro-[2 + 2] cycloaddition were studied. The controlling role of orbital symmetry rather than reaction thermodynamics is demonstrated.
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Affiliation(s)
- Xiaolin Yue
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- College of Chemistry, Nankai University, Tianjin 300071, China
| | - Qingyang Zhou
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
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4
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Smith E, Jones KD, O'Brien L, Argent SP, Salome C, Lefebvre Q, Valery A, Böcü M, Newton GN, Lam HW. Silver(I)-Catalyzed Synthesis of Cuneanes from Cubanes and their Investigation as Isosteres. J Am Chem Soc 2023. [PMID: 37478562 PMCID: PMC10401713 DOI: 10.1021/jacs.3c03207] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Bridged or caged polycyclic hydrocarbons have rigid structures that project substituents into precise regions of 3D space, making them attractive as linking groups in materials science and as building blocks for medicinal chemistry. The efficient synthesis of new or underexplored classes of such compounds is, therefore, an important objective. Herein, we describe the silver(I)-catalyzed rearrangement of 1,4-disubstituted cubanes to cuneanes, which are strained hydrocarbons that have not received much attention since they were first described in 1970. The synthesis of 2,6-disubstituted or 1,3-disubstituted cuneanes can be achieved with high regioselectivities, with the regioselectivity being dependent on the electronic character of the cubane substituents. A preliminary assessment of cuneanes as scaffolds for medicinal chemistry suggests cuneanes could serve as isosteric replacements of trans-1,4-disubstituted cyclohexanes and 1,3-disubstituted benzenes. An analogue of the anticancer drug sonidegib was synthesized, in which the 1,2,3-trisubstituted benzene was replaced with a 1,3-disubstituted cuneane.
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Affiliation(s)
- Elliot Smith
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Kieran D Jones
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Luke O'Brien
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Stephen P Argent
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | | | | | | | - Mina Böcü
- SpiroChem AG, 4058 Basel, Switzerland
| | - Graham N Newton
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Hon Wai Lam
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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5
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Takebe H, Matsubara S. Catalytic Asymmetric Synthesis of 2,6‐Disubstituted Cuneanes via Enantioselective Constitutional Isomerization of 1,4‐Disubstituted Cubanes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hiyori Takebe
- Kyoto University Faculty of Engineering Graduate School of Engineering: Kyoto Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Material Chemistry JAPAN
| | - Seijiro Matsubara
- Kyoto University Faculty of Engineering Graduate School of Engineering: Kyoto Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Material Chemistry Kyotodaigaku-katsura, Nishikyo 615-8510 Kyoto JAPAN
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6
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Berger A, Buckley CE, Paskevicius M. Synthesis of closo-CB 11H 12- Salts Using Common Laboratory Reagents. Inorg Chem 2021; 60:14744-14751. [PMID: 34514784 DOI: 10.1021/acs.inorgchem.1c01896] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lithium and sodium salts of the closo-carbadodecaborate anion [CB11H12]- have been shown to form stable solid-state electrolytes with excellent ionic conductivity for all-solid-state batteries (ASSB). However, potential commercial application is currently hindered by the difficult, low-yielding, and expensive synthetic pathways. We report a novel and cost-effective method to synthesize the [CB11H12]- anion in a 40% yield from [B11H14]-, which can be synthesized using common laboratory reagents. The method avoids the use of expensive and dangerous reagents such as NaH, decaborane, and CF3SiMe3 and shows excellent reproducibility in product yield and purity.
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Affiliation(s)
- Amanda Berger
- Department of Physics and Astronomy, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
| | - Craig E Buckley
- Department of Physics and Astronomy, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
| | - Mark Paskevicius
- Department of Physics and Astronomy, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
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7
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Kielesiński Ł, Morawski OW, Barboza CA, Gryko DT. Polarized Helical Coumarins: [1,5] Sigmatropic Rearrangement and Excited-State Intramolecular Proton Transfer. J Org Chem 2021; 86:6148-6159. [PMID: 33830755 PMCID: PMC8154611 DOI: 10.1021/acs.joc.0c02978] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The tandem process
of phenol addition to a cyclic α,β-unsaturated
ester followed by intramolecular transesterification and [1,5] sigmatropic
rearrangement affords a series of helical coumarins based upon a previously
unknown 3-amino-7-hydroxybenzo[3,4]cyclohepta[1,2-c]chromen-6-one core. These novel polarized coumarins, possessing
a β-ketoester moiety, have been employed to synthesize more
rigid and helical coumarin–pyrazolones, which display green
fluorescence. The enhanced emission of coumarin–pyrazolones
in polar solvents depends on the nature of the S1 state. The coumarin–pyrazolones are predicted to have
two vertical states close in energy: a weakly absorbing S1 (1LE) followed by a bright S2 state (1CT). In polar solvents, the 1CT can be stabilized below the 1LE and may become
the fluorescent state. Solvatochromism of the fluorescence spectra
confirms this theoretical prediction. The presence of an N—H···O=C
intramolecular hydrogen bond in these coumarin–pyrazolone hybrids
facilitates excited-state intramolecular proton transfer (ESIPT).
This process leads to a barrierless conical intersection with the
ground electronic state and opens a radiationless deactivation channel
effectively competing with fluorescence. Solvent stabilization of
the CT state increases the barrier for ESIPT and decreases the efficiency
of the nonradiative channel. This results in the observed correlation
between solvatochromism and an increase of fluorescence intensity
in polar solvents.
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Affiliation(s)
- Łukasz Kielesiński
- Institute of Organic Chemistry of Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.,Institute of Physics of Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
| | - Olaf W Morawski
- Institute of Physics of Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
| | - Cristina A Barboza
- Institute of Physics of Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
| | - Daniel T Gryko
- Institute of Organic Chemistry of Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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8
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Shmal’ko AV, Sivaev IB. Chemistry of Carba-closo-decaborate Anions [CB9H10]– (Review). RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023619140067] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Pommerening P, Oestreich M. Chiral Modification of the Tetrakis(pentafluorophenyl)borate Anion with Myrtanyl Groups. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901434] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Phillip Pommerening
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
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10
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Zhang Q, Lv J, Luo S. Enantioselective Diels-Alder reaction of anthracene by chiral tritylium catalysis. Beilstein J Org Chem 2019; 15:1304-1312. [PMID: 31293679 PMCID: PMC6604712 DOI: 10.3762/bjoc.15.129] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 05/24/2019] [Indexed: 11/26/2022] Open
Abstract
The combination of the trityl cation and a chiral weakly coordinating Fe(III)-based bisphosphate anion was used to develop a new type of a highly active carbocation Lewis acid catalyst. The stereocontrol potential of the chiral tritylium ion pair was demonstrated by its application in an enantioselective Diels–Alder reaction of anthracene.
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Affiliation(s)
- Qichao Zhang
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, China
| | - Jian Lv
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, China.,State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, 266042, Qingdao, China
| | - Sanzhong Luo
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, China.,Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, 100084, Beijing, China
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11
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Kanazawa J, Kitazawa Y, Uchiyama M. Recent Progress in the Synthesis of the Monocarba-closo-dodecaborate(-) Anions. Chemistry 2019; 25:9123-9132. [PMID: 30908764 DOI: 10.1002/chem.201900174] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Indexed: 01/01/2023]
Abstract
This Concept article focuses on the rapid growth in studies of the chemistry of the monocarba-closo-dodecaborate(-) anion (C1 carborane anion). As one of the most stable anions known, the C1 carborane anion has been useful for exploring the chemistry of highly reactive cations. On the other hand, development of novel functional molecules utilizing the unique properties of C1 carborane anion (e.g., σ-aromaticity, rigid spherical skeleton) has progressed more slowly. The main reason for this is the relatively undeveloped state of synthetic chemistry in this area. Recent advances in the synthetic chemistry of C1 carborane anion are highlighted in this Concept article, focusing on cross-coupling reactions at the carbon vertex, direct conversion of B-H bonds, and the synthesis of multivalent weakly coordinating anions. These progressions move this species beyond its well-established role of highly stable "counter" monocharged anion.
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Affiliation(s)
- Junichiro Kanazawa
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
- Cluster of Pioneering Research (CPR), Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Yu Kitazawa
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
- Cluster of Pioneering Research (CPR), Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
- Research Initiative for Supra-Materials (RISM), Shinshu University, Ueda, 386-8567, Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
- Cluster of Pioneering Research (CPR), Advanced Elements Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
- Research Initiative for Supra-Materials (RISM), Shinshu University, Ueda, 386-8567, Japan
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12
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Locke GM, Bernhard SSR, Senge MO. Nonconjugated Hydrocarbons as Rigid-Linear Motifs: Isosteres for Material Sciences and Bioorganic and Medicinal Chemistry. Chemistry 2019; 25:4590-4647. [PMID: 30387906 DOI: 10.1002/chem.201804225] [Citation(s) in RCA: 122] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Revised: 10/20/2018] [Indexed: 01/02/2023]
Abstract
Nonconjugated hydrocarbons, like bicyclo[1.1.1]pentane, bicyclo[2.2.2]octane, triptycene, and cubane are a unique class of rigid linkers. Due to their similarity in size and shape they are useful mimics of classic benzene moieties in drugs, so-called bioisosteres. Moreover, they also fulfill an important role in material sciences as linear linkers, in order to arrange various functionalities in a defined spatial manner. In this Review article, recent developments and usages of these special, rectilinear systems are discussed. Furthermore, we focus on covalently linked, nonconjugated linear arrangements and discuss the physical and chemical properties and differences of individual linkers, as well as their application in material and medicinal sciences.
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Affiliation(s)
- Gemma M Locke
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
| | - Stefan S R Bernhard
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
| | - Mathias O Senge
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
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13
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Akimoto G, Otsuka M, Miyamoto K, Muranaka A, Hashizume D, Takita R, Uchiyama M. One-pot Annulation for Biaryl-fused Monocarba-closo
-dodecaborate through Aromatic B−H Bond Disconnection. Chem Asian J 2018; 13:913-917. [DOI: 10.1002/asia.201800053] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Indexed: 12/25/2022]
Affiliation(s)
- Gaku Akimoto
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Mai Otsuka
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Kazunori Miyamoto
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Atsuya Muranaka
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Daisuke Hashizume
- Materials Characterization Support Unit; RIKEN Center for Emergent Matter Science; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Ryo Takita
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
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14
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Kitazawa Y, Watanabe M, Masumoto Y, Otsuka M, Miyamoto K, Muranaka A, Hashizume D, Takita R, Uchiyama M. “Dumbbell”- and “Clackers”-Shaped Dimeric Derivatives of Monocarba-closo
-dodecaborate. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201710122] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yu Kitazawa
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Mamoru Watanabe
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Yui Masumoto
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Mai Otsuka
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Kazunori Miyamoto
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Atsuya Muranaka
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Daisuke Hashizume
- Materials Characterization Support Unit; RIKEN Center for Emergent Matter Science; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Ryo Takita
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
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15
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Kitazawa Y, Watanabe M, Masumoto Y, Otsuka M, Miyamoto K, Muranaka A, Hashizume D, Takita R, Uchiyama M. “Dumbbell”- and “Clackers”-Shaped Dimeric Derivatives of Monocarba-closo
-dodecaborate. Angew Chem Int Ed Engl 2018; 57:1501-1504. [DOI: 10.1002/anie.201710122] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Indexed: 01/15/2023]
Affiliation(s)
- Yu Kitazawa
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Mamoru Watanabe
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Yui Masumoto
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Mai Otsuka
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Kazunori Miyamoto
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Atsuya Muranaka
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Daisuke Hashizume
- Materials Characterization Support Unit; RIKEN Center for Emergent Matter Science; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Ryo Takita
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
- Advanced Elements Chemistry Research Team; RIKEN Center for Sustainable Resource Science, and Elements Chemistry Laboratory, RIKEN; 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
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16
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Wang S, McCrea-Hendrick ML, Weinstein CM, Caputo CA, Hoppe E, Fettinger JC, Olmstead MM, Power PP. Tin(II) Hydrides as Intermediates in Rearrangements of Tin(II) Alkyl Derivatives. J Am Chem Soc 2017; 139:6596-6604. [PMID: 28399365 DOI: 10.1021/jacs.7b02271] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reactions of the Sn(II) hydrides [ArSn(μ-H)]2 (1) (Ar = AriPr4 (1a), AriPr6 (1b); AriP4 = C6H3-2,6-(C6H3-2,6-iPr2)2, AriPr6 = C6H3-2,6-(C6H2-2,4,6-iPr3)2) with norbornene (NB) or norbornadiene (NBD) readily generate the bicyclic alkyl-/alkenyl-substituted stannylenes, ArSn(norbornyl) (2a or 2b) and ArSn(norbornenyl) (3a or 3b), respectively. Heating a toluene solution of 3a or 3b at reflux afforded the rearranged species ArSn(3-tricyclo[2.2.1.02,6]heptane) (4a or 4b), in which the norbornenyl ligand is transformed into a nortricyclyl group. 1H NMR studies of the reactions of 4a or 4b with tert-butylethylene indicated the existence of an apparently unique reversible β-hydride elimination from the bicyclic substituted aryl/alkyl stannylenes 2a or 2b and 3a or 3b. Mechanistic studies indicated that the transformation of 3a or 3b into 4a or 4b occurs via a β-hydride elimination of 1a or 1b to regenerate NBD. Kinetic studies showed that the conversion of 3a or 3b to 4a or 4b is first order. The rate constant k for the conversion of 3a into 3b was determined to be 3.33 × 10-5 min-1, with an activation energy Ea of 16.4 ± 0.7 kcal mol-1.
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Affiliation(s)
- Shuai Wang
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - Madison L McCrea-Hendrick
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - Cory M Weinstein
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - Christine A Caputo
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - Elke Hoppe
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - James C Fettinger
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - Marilyn M Olmstead
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
| | - Philip P Power
- Department of Chemistry, University of California, Davis , 1 Shields Avenue, Davis, California 95616, United States
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17
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Pommerening P, Mohr J, Friebel J, Oestreich M. Synthesis of a Chiral Borate Counteranion, Its Trityl Salt, and Application Thereof in Lewis‐Acid Catalysis. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700239] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Phillip Pommerening
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Jens Mohr
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Jonas Friebel
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Germany
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18
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Kitazawa Y, Takita R, Yoshida K, Muranaka A, Matsubara S, Uchiyama M. “Naked” Lithium Cation: Strongly Activated Metal Cations Facilitated by Carborane Anions. J Org Chem 2017; 82:1931-1935. [DOI: 10.1021/acs.joc.6b02677] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yu Kitazawa
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ryo Takita
- Elements
Chemistry Laboratory, RIKEN, and Advanced Elements Chemistry Research
Team, RIKEN Center for Sustainable Resource Science (CSRS), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Kengo Yoshida
- Elements
Chemistry Laboratory, RIKEN, and Advanced Elements Chemistry Research
Team, RIKEN Center for Sustainable Resource Science (CSRS), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Atsuya Muranaka
- Elements
Chemistry Laboratory, RIKEN, and Advanced Elements Chemistry Research
Team, RIKEN Center for Sustainable Resource Science (CSRS), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Seijiro Matsubara
- Department
of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo, Kyoto 615-8510, Japan
| | - Masanobu Uchiyama
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Elements
Chemistry Laboratory, RIKEN, and Advanced Elements Chemistry Research
Team, RIKEN Center for Sustainable Resource Science (CSRS), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
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19
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Jalife S, Mondal S, Cabellos JL, Martinez-Guajardo G, Fernandez-Herrera MA, Merino G. The cubyl cation rearrangements. Chem Commun (Camb) 2016; 52:3403-5. [PMID: 26880646 DOI: 10.1039/c5cc10568d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Born-Oppenheimer molecular dynamics simulations and high-level ab initio computations predict that the cage-opening rearrangement of the cubyl cation to the 7H(+)-pentalenyl cation is feasible in the gas phase. The rate-determining step is the formation of the cuneyl cation with an activation barrier of 25.3 kcal mol(-1) at the CCSD(T)/def2-TZVP//MP2/def2-TZVP level. Thus, the cubyl cation is kinetically stable enough to be formed and trapped at moderate temperatures, but it may be rearranged at higher temperatures.
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Affiliation(s)
- Said Jalife
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico.
| | - Sukanta Mondal
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico.
| | - Jose Luis Cabellos
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico.
| | - Gerardo Martinez-Guajardo
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico. and Unidad Académica de Ciencias Químicas, Área de Ciencias de la Salud, Universidad Autónoma de Zacatecas, Km. 6 carretera Zacatecas-Guadalajara s/n, Ejido La Escondida C. P. 98160, Zacatecas, Zac., Mexico
| | - Maria A Fernandez-Herrera
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico. and CONACyT Research Fellow, Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico
| | - Gabriel Merino
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., Mexico.
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20
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Merna J, Vlček P, Volkis V, Michl J. Li+ Catalysis and Other New Methodologies for the Radical Polymerization of Less Activated Olefins. Chem Rev 2016; 116:771-85. [DOI: 10.1021/acs.chemrev.5b00485] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Jan Merna
- Department
of Polymers, University of Chemistry and Technology, Prague, Technická
5, 16628 Prague, Czech Republic
| | - Petr Vlček
- Institute
of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Square 2, 16206 Prague, Czech Republic
| | - Victoria Volkis
- Department
of Natural Sciences, University of Maryland Eastern Shore, Princess Anne, Maryland 21853, United States
| | - Josef Michl
- Department
of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
- Institute
of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 11610 Prague, Czech Republic
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21
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Pospíšil L, Kaleta J, Michl J. Electrochemical Hydrogen Oxidation in Toluene/LiCB11
Me12
: H2
as a Surrogate for Lithium Metal? ChemElectroChem 2015. [DOI: 10.1002/celc.201500332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lubomír Pospíšil
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic, Dolejškova 2155/3, 182 23; Prague 8 Czech Republic
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10; Prague 6 Czech Republic
| | - Jiří Kaleta
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10; Prague 6 Czech Republic
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic, Flemingovo nám. 2, CZ-166 10; Prague 6 Czech Republic
- Department of Chemistry and Biochemistry; University of Colorado, 215 UCB; Boulder CO 80309-0215 USA
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22
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Dai L, Wigman L, Zhang K. Sensitive and direct determination of lithium by mixed-mode chromatography and charged aerosol detection. J Chromatogr A 2015; 1408:87-92. [DOI: 10.1016/j.chroma.2015.06.063] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Revised: 06/21/2015] [Accepted: 06/24/2015] [Indexed: 11/24/2022]
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23
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Biegasiewicz KF, Griffiths JR, Savage GP, Tsanaktsidis J, Priefer R. Cubane: 50 years later. Chem Rev 2015; 115:6719-45. [PMID: 26102302 DOI: 10.1021/cr500523x] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Kyle F Biegasiewicz
- †Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Justin R Griffiths
- ‡Department of Chemistry, University at Buffalo, Buffalo, New York 14260-1660, United States
| | - G Paul Savage
- §Ian Wark Laboratory, CSIRO Manufacturing Flagship, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - John Tsanaktsidis
- §Ian Wark Laboratory, CSIRO Manufacturing Flagship, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - Ronny Priefer
- ∥College of Pharmacy, Western New England University, Springfield, Massachusetts 01119, United States
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24
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Abstract
Once seldom encountered outside of a few laboratories, carboranes are now everywhere, playing a role in the development of a broad range of technologies encompassing organic synthesis, radionuclide handling, drug design, heat-resistant polymers, cancer therapy, nanomaterials, catalysis, metal-organic frameworks, molecular machines, batteries, electronic devices, and more. This perspective highlights selected examples in which the special attributes of carboranes and metallacarboranes are being exploited for targeted purposes in the laboratory and in the wider world.
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Affiliation(s)
- Russell N Grimes
- Department of Chemistry, University of Virginia, Charlottesville, VA 22901, USA.
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25
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Moritz R, Wagner M, Schollmeyer D, Baumgarten M, Müllen K. Hydrophobic Encapsulated Phosphonium Salts-Synthesis of Weakly Coordinating Cations and their Application in Wittig Reactions. Chemistry 2015; 21:9119-25. [DOI: 10.1002/chem.201406370] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Indexed: 11/12/2022]
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26
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Hammer BAG, Moritz R, Stangenberg R, Baumgarten M, Müllen K. The polar side of polyphenylene dendrimers. Chem Soc Rev 2015; 44:4072-90. [DOI: 10.1039/c4cs00245h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The site-specific functionalization of poly(phenylene) dendrimers can produce macromolecules with a range of different polarities.
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Affiliation(s)
| | - Ralf Moritz
- Max-Planck-Institut für Polymerforschung
- 55128 Mainz
- Germany
| | | | | | - Klaus Müllen
- Max-Planck-Institut für Polymerforschung
- 55128 Mainz
- Germany
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27
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Mayeux C, Burk P, Gal JF, Kaljurand I, Koppel I, Leito I, Sikk L. Gas-phase lithium cation basicity: revisiting the high basicity range by experiment and theory. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1962-1973. [PMID: 25190215 DOI: 10.1007/s13361-014-0970-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 07/14/2014] [Accepted: 07/14/2014] [Indexed: 06/03/2023]
Abstract
According to high level calculations, the upper part of the previously published FT-ICR lithium cation basicity (LiCB at 373 K) scale appeared to be biased by a systematic downward shift. The purpose of this work was to determine the source of this systematic difference. New experimental LiCB values at 373 K have been measured for 31 ligands by proton-transfer equilibrium techniques, ranging from tetrahydrofuran (137.2 kJ mol(-1)) to 1,2-dimethoxyethane (202.7 kJ mol(-1)). The relative basicities (ΔLiCB) were included in a single self-consistent ladder anchored to the absolute LiCB value of pyridine (146.7 kJ mol(-1)). This new LiCB scale exhibits a good agreement with theoretical values obtained at G2(MP2) level. By means of kinetic modeling, it was also shown that equilibrium measurements can be performed in spite of the formation of Li(+) bound dimers. The key feature for achieving accurate equilibrium measurements is the ion trapping time. The potential causes of discrepancies between the new data and previous experimental measurements were analyzed. It was concluded that the disagreement essentially finds its origin in the estimation of temperature and the calibration of Cook's kinetic method.
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28
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Douvris C, Michl J. Update 1 of:Chemistry of the Carba-closo-dodecaborate(−) Anion, CB11H12–. Chem Rev 2014; 113:PR179-233. [PMID: 23944158 DOI: 10.1021/cr400059k] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christos Douvris
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
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29
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Durkó G, Jalsovszky I. Solvent-induced, selective rearrangement of hydrogen cubane-1,4-dicarboxylate to hydrogen cuneane-2,6-dicarboxylate. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Kaleta J, Tarábek J, Akdag A, Pohl R, Michl J. The 16 CB11(CH3)n(CD3)12–n• Radicals with 5-Fold Substitution Symmetry: Spin Density Distribution in CB11Me12•. Inorg Chem 2012; 51:10819-24. [DOI: 10.1021/ic301236s] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiří Kaleta
- Institute of Organic
Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610
Prague, Czech Republic
| | - Ján Tarábek
- Institute of Organic
Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610
Prague, Czech Republic
| | - Akin Akdag
- Institute of Organic
Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610
Prague, Czech Republic
- Department of Chemistry
and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Radek Pohl
- Institute of Organic
Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610
Prague, Czech Republic
| | - Josef Michl
- Institute of Organic
Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610
Prague, Czech Republic
- Department of Chemistry
and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
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31
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Türp D, Nguyen TTT, Baumgarten M, Müllen K. Uniquely versatile: nano-site defined materials based on polyphenylene dendrimers. NEW J CHEM 2012. [DOI: 10.1039/c1nj20449a] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Türp D, Wagner M, Enkelmann V, Müllen K. Synthesis of Nanometer-Sized, Rigid, and Hydrophobic Anions. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007070] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Türp D, Wagner M, Enkelmann V, Müllen K. Synthesis of Nanometer-Sized, Rigid, and Hydrophobic Anions. Angew Chem Int Ed Engl 2011; 50:4962-5. [DOI: 10.1002/anie.201007070] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Indexed: 11/07/2022]
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34
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Braunecker WA, Akdag A, Boon BA, Michl J. Highly Branched Polypropylene via Li+-Catalyzed Radical Polymerization. Macromolecules 2011. [DOI: 10.1021/ma102825r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wade A. Braunecker
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Akin Akdag
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Byron A. Boon
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Josef Michl
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague 6, Czech Republic
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35
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Valášek M, Štursa J, Pohl R, Michl J. Microwave-Assisted Alkylation of [CB11H12]− and Related Anions. Inorg Chem 2010; 49:10247-54. [DOI: 10.1021/ic101234p] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michal Valášek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
| | - Jan Štursa
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
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36
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Valášek M, Štursa J, Pohl R, Michl J. Lithium Salts of [1,12-Dialkyl-CB11Me10]− Anions. Inorg Chem 2010; 49:10255-63. [DOI: 10.1021/ic101235e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michal Valášek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
| | - Jan Štursa
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
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37
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Maleev VI, Skrupskaya TV, Saveléva TF, Mkrtchyan AF, Saghiyan AS. Lithium salts of chiral metallocomplex anions as catalysts for asymmetric trimethylsilylcyanation of aldehydes. Russ Chem Bull 2010. [DOI: 10.1007/s11172-010-0118-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Ethynylmonocarba-closo-dodecaborates: M[12-HCC-closo-1-CB11H11] and M[7,12-(HCC)2-closo-1-CB11H10] (M=Cs+, [Et4N]+). J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2010.02.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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39
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Abstract
For decades, triflic acid, methyl triflate, and trialkylsilyl triflate reagents have served synthetic chemistry well as clean, strong electrophilic sources of H(+), CH(3)(+), and R(3)Si(+), respectively. However, a number of weakly basic substrates are unreactive toward these reagents. In addition, triflate anion can express undesired nucleophilicity toward electrophilically activated substrates. In this Account, we describe methods that replace triflate-based electrophilic reagents with carborane reagents. Using carborane anions of type CHB(11)R(5)X(6)(-) (R = H, Me, X; X = Br, Cl), members of a class of notably inert, weakly nucleophilic anions, significantly increases the electrophilicity of these reagents and shuts down subsequent nucleophilic chemistry of the anion. Thus, H(carborane) acids cleanly protonate benzene, phosphabenzene, C(60), etc., while triflic acid does not. Similarly, CH(3)(carborane) reagents can methylate substrates that are inert to boiling neat methyl triflate, including benzene, phosphabenzenes, phosphazenes, and the pentamethylhydrazinium ion, which forms the dipositive ethane analogue, Me(6)N(2)(2+). Methyl carboranes are also surprisingly effective in abstracting hydride from simple alkanes to give isolable carbocation salts, e.g., t-butyl cation. Trialkylsilyl carborane reagents, R(3)Si(carborane), abstract halides from substrates to produce cations of unprecedented reactivity. For example, fluoride is extracted from freons to form carbocations; chloride is extracted from IrCl(CO)(PPh(3))(2) to form a coordinatively unsaturated iridium cation that undergoes oxidative addition with chlorobenzene at room temperature; and silylation of cyclo-N(3)P(3)Cl(6) produces a catalyst for the polymerization of phosphazenes that functions at room temperature. Although currently too expensive for widespread use, carborane reagents are nevertheless of considerable interest as specialty reagents for making reactive cations and catalysts.
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Affiliation(s)
- Christopher A Reed
- Center for s and p Block Chemistry, Department of Chemistry, University of California, Riverside, California 92521, USA.
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40
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Abstract
Cubane can be considered the ideal internal standard for reactions observed by NMR, due to an almost complete benign reactivity and uniquely reliable 1H and 13C NMR resonances, in wide variety of deuterated solvents.
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41
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Finze M, Sprenger JAP, Schaack BB. Salts of the 1-cyanocarba-closo-dodecaborate anions [1-NC-closo-1-CB11X11]− (X = H, F, Cl, Br, I). Dalton Trans 2010; 39:2708-16. [DOI: 10.1039/b922720b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Chiral ion pairs in catalysis: lithium salts of chiral metallocomplex anions as catalysts for asymmetric C–C bond formation. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.06.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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43
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Volkis V, Mei H, Shoemaker RK, Michl J. LiCB11(CH3)12-Catalyzed Radical Polymerization of Isobutylene: Highly Branched Polyisobutylene and an Isobutylene−Ethyl Acrylate Copolymer. J Am Chem Soc 2009; 131:3132-3. [DOI: 10.1021/ja807297g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Victoria Volkis
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
| | - Hua Mei
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
| | - Richard K. Shoemaker
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
| | - Josef Michl
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
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44
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Montero-Campillo MM, Cabaleiro-Lago EM, Rodríguez-Otero J. A theoretical study of pericyclic rearrangements catalyzed by lithium. J Phys Chem A 2008; 112:5218-23. [PMID: 18491853 DOI: 10.1021/jp801130s] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The role of lithium cation in the isomerization from diademane to triquinacene and in the Claisen reaction from phenyl allyl ether to 6-allyl-2,4-cyclohexadienone was analyzed. The nature of the interaction of the lithium ion with the reacting molecules in the transition state was studied using supermolecule and perturbational methods. The aromaticity of the transition state in presence of lithium was compared with that for the same reaction in absence of catalyst, employing tools such as nucleus-independent chemical shift and anisotropy of the induced current density. Our results support that the catalytic effect is caused principally by a more favorable electrostatic interaction of lithium cation with the transition states of both reactions.
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Affiliation(s)
- M Merced Montero-Campillo
- Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, Campus Sur, Avda. das Ciencias, s/n, 15782 Santiago de Compostela, Spain
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45
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Müller LO, Scopelitti R, Krossing I. The Fluorinated Lithiumalkoxide LiORF (RF = C(CF3)2Mes), the Alcohol RFOH and Attempts to use them as Precursors for New Weakly Coordinating Anions (WCAs). Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200700593] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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46
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Müller LO, Krossing I. A Highly Hexane Soluble Lithium Salt and other Starting Materials of the Fluorinated Weakly Coordinating Anion [Al{OC(CF3)2(CH2SiMe3)}4]−. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200700579] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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47
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Abstract
After a brief introduction to the electronic structure of the three-dimensionally aromatic icosahedral closo-monocarbadodecaborate anion CB11H12-, some recent results for its permethylated version, CB11Me12- and three highly reactive electroneutral analogs are presented and discussed. These are the radical CB11Me12·, the boronium ylide CB11Me11 with a naked boron vertex, and the isomeric carbonium ylide with a naked carbon vertex. These ylides are probably better viewed as unusual types of singlet borylene and carbene, respectively.
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48
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Vyakaranam K, Körbe S, Michl J. Air-Initiated Radical Polymerization of Lithium Salts of omega-(Undecamethylcarba-closo-dodecaboran-1'-yl)alk-1-enes, CH2=CH(CH2)(n-2)C(BMe)11- Li+. J Am Chem Soc 2007; 128:5680-6. [PMID: 16637634 DOI: 10.1021/ja054967k] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report an easy access to the salts of the LiC(BMe)11- anion, which greatly simplifies the synthesis of compounds carrying the -C(BMe)11- substituent, including the title anions. The previously recognized and puzzling spontaneous oligomerization of the solid lithium salts CH2=CH(CH2)(n-2)C(BMe)11- Li+ upon storage under ambient conditions is now shown to proceed by a radical mechanism, with the "naked" Li+ cation acting as a catalyst. The degree of polymerization is higher in solution, especially when azoisobutyronitrile (AIBN) is used as initiator (up to approximately 50). Initiation by the thermal decomposition of AIBN is also catalyzed by naked Li+, and this initiator is effective at room temperature. Di-tert-butyl peroxide and UV irradiation can also be used. The observation of Li+ catalysis agrees with a prior prediction from ab initio calculations, according to which Li+ complexation of ethylene strongly lowers the activation energy for methyl radical addition. The results bear on the current discussion of the possible sensitivity of radical clocks to their molecular environment and suggest that naked Li+ will catalyze the radical polymerization of simple terminal alkenes.
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Affiliation(s)
- Kamesh Vyakaranam
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA
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49
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King BT, Körbe S, Schreiber PJ, Clayton J, Němcová A, Havlas Z, Vyakaranam K, Fete MG, Zharov I, Ceremuga J, Michl J. The Sixteen CB11HnMe12-n- Anions with Fivefold Substitution Symmetry: Anodic Oxidation and Electronic Structure. J Am Chem Soc 2007; 129:12960-80. [DOI: 10.1021/ja066247z] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Benjamin T. King
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Stefanie Körbe
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Peter J. Schreiber
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Joshua Clayton
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Adriana Němcová
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Zdeněk Havlas
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Kamesh Vyakaranam
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Matthew G. Fete
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Ilya Zharov
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Jason Ceremuga
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
| | - Josef Michl
- Contribution from the Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic, and the Department of Chemistry, University of Nevada, Reno, Nevada 89557
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50
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Körbe S, Schreiber PJ, Michl J. Chemistry of the Carba-closo-dodecaborate(−) Anion, CB11H12-. Chem Rev 2006; 106:5208-49. [PMID: 17165686 DOI: 10.1021/cr050548u] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stefanie Körbe
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
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