1
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Thakur SK, Roig N, Monreal-Corona R, Langer J, Alonso M, Harder S. Similarities and Differences in Benzene Reduction with Ca, Sr, Yb and Sm: Strong Evidence for Tetra-Anionic Benzene. Angew Chem Int Ed Engl 2024; 63:e202405229. [PMID: 38613386 DOI: 10.1002/anie.202405229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Revised: 04/09/2024] [Accepted: 04/12/2024] [Indexed: 04/14/2024]
Abstract
Inverse sandwich complexes of Yb and Sm stabilized by a bulky β-diketiminate (BDI) ligand have been prepared: (BDI)Ln(η6,η6-C6H6)Ln(BDI); Ln=lanthanide. Coordinated benzene ligands can be neutral, di-anionic or, often controversially discussed, even tetra-anionic. The formal charge on benzene is correlated to assignment of the metal oxidation state which generally poses a problem. Herein, we take advantage of the structural similarities found when comparing CaII with YbII, and SrII with SmII complexes. In this work, we found an excellent overlap of the Ca/Yb inverse sandwich structures but a striking difference for the Sr/Sm pair. The much shorter Sm-N and Sm-C6H6 distances are strong evidence for a SmIII-benzene-4-SmIII assignment. This was further supported by NMR spectroscopy, magnetic susceptibility, reactivity and comprehensive computational investigation.
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Affiliation(s)
- Sandeep Kumar Thakur
- Inorganic and Organometallic Chemistry, Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
| | - Nil Roig
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), 1050, Brussels, Belgium
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Roger Monreal-Corona
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), 1050, Brussels, Belgium
- Institut de Química Computacional i Catàlisi, Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Jens Langer
- Inorganic and Organometallic Chemistry, Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
| | - Mercedes Alonso
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), 1050, Brussels, Belgium
| | - Sjoerd Harder
- Inorganic and Organometallic Chemistry, Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
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2
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Goli M, Bressanini D, Shahbazian S. On the nature of the two-positron bond: evidence for a novel bond type. Phys Chem Chem Phys 2023; 25:29531-29547. [PMID: 37905569 DOI: 10.1039/d3cp03003b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
The nature of the newly proposed two-positron bond in (PsH)2, which is composed of two protons, four electrons and two positrons, is considered in this contribution. The study is done at the multi-component-Hartree-Fock (MC-HF) and the Diffusion Monte Carlo (DMC) levels of theory by comparing ab initio data, analyzing the spatial structure of the DMC wavefunction, and applying the multi-component quantum theory of atoms in molecules and the two-component interacting quantum atoms energy partitioning schemes to the MC-HF wavefunction. The analysis demonstrates that (PsH)2 to a good approximation may be conceived of as two slightly perturbed PsH atoms, bonded through a two-positron bond. In contrast to the usual two-electron bonds, the positron exchange phenomenon is quite marginal in the considered two-positron bond. The dominant stabilizing mechanism of bonding is a novel type of classical electrostatic interaction between the positrons, which are mainly localized between nuclei, and the surrounding electrons. To emphasize its uniqueness, this mechanism of bonding is proposed to be called gluonic which has also been previously identified as the main driving mechanism behind formation of the one-positron bond in [H-,e+,H-]. We conclude that the studied two-positron bond should not be classified as a covalent bond and it must be seen as a brand-new type of bond, foreign to the electronic bonding modes discovered so far in the purely electronic systems.
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Affiliation(s)
- Mohammad Goli
- School of Nano Science, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran.
| | - Dario Bressanini
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Como, Italy.
| | - Shant Shahbazian
- Department of Physics, Shahid Beheshti University, Evin, Tehran 19839-69411, Iran.
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3
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Ilyin IY, Mirzaeva IV, Sukhikh TS, Bonegardt DV, Basova TV. STUDY OF THE CORRELATION BETWEEN THE STRUCTURE OF THE [Ir(сod)Cp] COMPLEX AND ITS THERMAL PROPERTIES. J STRUCT CHEM+ 2021. [DOI: 10.1134/s0022476621120064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Liu S, Smith BA, Kirkland JK, Vogiatzis KD, Girolami GS. Nature of the Short Rh-Li Contact between Lithium and the Rhodium ω-Alkenyl Complex [Rh(CH 2CMe 2CH 2CH═CH 2) 2] . Inorg Chem 2021; 60:8790-8801. [PMID: 34097392 DOI: 10.1021/acs.inorgchem.1c00737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the preparation of the cis-bis(η1,η2-2,2-dimethylpent-4-en-1-yl)rhodate(I) anion, cis-[Rh(CH2CMe2CH2CH═CH2)2]-, and the interaction of this species with Li+ both in solution and in the solid state. For the lithium(diethyl ether) salt [Li(Et2O)][Rh(CH2CMe2CH2CH═CH2)2], VT-NMR and 1H{7Li} NOE NMR studies in toluene-d8 show that the Li+ cation is in close proximity to the dz2 orbital of rhodium. In the solid-state structure of the lithium(12-crown-4) salt [Li(12-crown-4)2][Li{Rh(CH2CMe2CH2CH═CH2)2}2], one lithium atom is surrounded by two [Rh(CH2CMe2CH2CH═CH2)2]- anions, and in this assembly there are two unusually short Rh-Li distances of 2.48 Å. DFT calculations, natural energy decomposition, and ETS-NOCV analysis suggest that there is a weak dative interaction between the 4dz2 orbitals on the Rh centers and the 2pz orbital of the Li+ cation. The charge-transfer term between Rh and Li+ contributes only about the 1/5 of the total interaction energy, however, and the principal driving force for the proximity of Rh and Li in compounds 1 and 2 is that Li+ is electrostatically attracted to negative charges on the dialkylrhodiate anions.
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Affiliation(s)
- Sumeng Liu
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Brett A Smith
- Department of Chemistry, University of Tennessee, 1416 Circle Drive, Knoxville, Tennessee 37996, United States
| | - Justin K Kirkland
- Department of Chemistry, University of Tennessee, 1416 Circle Drive, Knoxville, Tennessee 37996, United States
| | - Konstantinos D Vogiatzis
- Department of Chemistry, University of Tennessee, 1416 Circle Drive, Knoxville, Tennessee 37996, United States
| | - Gregory S Girolami
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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5
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DeWeerd NJ, Bukovsky EV, Castro KP, Kuvychko IV, Popov AA, Strauss SH, Boltalina OV. Steric and electronic effects of CF3 conformations in acene(CF3) derivatives. J Fluor Chem 2019. [DOI: 10.1016/j.jfluchem.2019.02.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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6
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Sirohiwal A, Hathwar VR, Dey D, Chopra D. Investigation of Chemical Bonding in In Situ Cryocrystallized Organometallic Liquids. Chemphyschem 2017; 18:2859-2863. [DOI: 10.1002/cphc.201700585] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Revised: 07/14/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Abhishek Sirohiwal
- Crystallography and Crystal Chemistry Laboratory; Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal- 462066 Madhya Pradesh India
- Current address: Max Planck Institute for Chemical Energy Conversion; Stiftstrasse 34-36 45470 Mülheim an der Ruhr Germany
| | - Venkatesha R. Hathwar
- Division of Physics; Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1, Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Dhananjay Dey
- Crystallography and Crystal Chemistry Laboratory; Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal- 462066 Madhya Pradesh India
| | - Deepak Chopra
- Crystallography and Crystal Chemistry Laboratory; Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal- 462066 Madhya Pradesh India
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7
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Keyvani ZA, Shahbazian S, Zahedi M. Tracing the Fingerprint of Chemical Bonds within the Electron Densities of Hydrocarbons: A Comparative Analysis of the Optimized and the Promolecule Densities. Chemphyschem 2016; 17:3260-3268. [DOI: 10.1002/cphc.201600632] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Zahra Alimohammadi Keyvani
- Faculty of Chemistry, Department of Pure Chemistry; Shahid Beheshti University, G. C.; Tehran 19839 Evin, P.O. Box 19395-4716 Iran), Tel/Fax: (98) 2122-431-661
| | - Shant Shahbazian
- Faculty of Chemistry, Department of Pure Chemistry; Shahid Beheshti University, G. C.; Tehran 19839 Evin, P.O. Box 19395-4716 Iran), Tel/Fax: (98) 2122-431-661
| | - Mansour Zahedi
- Faculty of Chemistry, Department of Pure Chemistry; Shahid Beheshti University, G. C.; Tehran 19839 Evin, P.O. Box 19395-4716 Iran), Tel/Fax: (98) 2122-431-661
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8
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Salvatella L. Theoretical design of tetra(arenediyl)bis(allyl) derivatives as model compounds for Cope rearrangement transition states. RSC Adv 2015. [DOI: 10.1039/c4ra16381h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Delocated structures bearing 2.3–2.5 Å C⋯C bonds are preferred for some tetra(arenediyl)bis(allyl) systems.
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Affiliation(s)
- L. Salvatella
- Instituto de Síntesis Química y Catálisis Homogénea – ISQCH
- CSIC – Universidad de Zaragoza
- 50009-Zaragoza
- Spain
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9
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Falceto A, Casanova D, Alemany P, Alvarez S. Distortions of π-coordinated arenes with anionic character. Chemistry 2014; 20:14674-89. [PMID: 25236369 DOI: 10.1002/chem.201403889] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Indexed: 11/10/2022]
Abstract
A qualitative analysis of the distortions that operate on the π system of bridging arenes with anionic character is presented and substantiated by computational studies at the density functional B3LYP and CASSCF levels. The observed effects of bonding to two metal atoms and of the negative charge are an expansion of the arene ring due to the partial occupation of π* orbitals, an elongation or compression distortion accompanied by a loss of the equivalence of carbon-carbon bonds due to a Jahn-Teller distortion of the arene dianions, and a ring puckering due to a second-order Jahn-Teller distortion that may appear independently of the existence of the first-order effect. The workings of the orbital mixing produced by these distortions have been revealed in a straightforward way by a pseudosymmetry analysis of the HOMOs of the distorted conformations. The systems studied include Li(I) and Y(III) adducts of benzene, as well as trimethylsilyl-substituted derivatives in the former case. An analysis of the structural data of a variety of purported di- and tetraanionic arene ligands coordinated to transition metals in several bridging modes has reproduced the main geometrical trends found in the computational study for the benzene and trimethylsilyl-substituted benzene dianions, allowing a classification of the variety of structural motifs found in the literature.
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Affiliation(s)
- Andrés Falceto
- Departament de Química Inorgànica and Institut de Química, Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona (Spain)
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10
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Tong F, Cruz CD, Jezowski SR, Zhou X, Zhu L, Al-Kaysi RO, Chronister EL, Bardeen CJ. Pressure dependence of the forward and backward rates of 9-tert-butylanthracene Dewar isomerization. J Phys Chem A 2014; 118:5349-54. [PMID: 24978589 DOI: 10.1021/jp504771b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
9-tert-Butylanthracene undergoes a photochemical reaction to form its strained Dewar isomer, which thermally back-reacts to reform the original molecule. When 9-tert-butylanthracene is dissolved in a polymer host, we find that both the forward and reverse isomerization rates are pressure-dependent. The forward photoreaction rate, which reflects the sum of contributions from photoperoxidation and Dewar isomerization, decreases by a factor of 1000 at high pressure (1.5 GPa). The back-reaction rate, on the other hand, increases by a factor of ∼3 at high pressure. Despite being highly strained and higher volume, the back-reaction reaction rate of the Dewar isomer is at least 100× less sensitive to pressure than that of the bi(anthracene-9,10-dimethylene) photodimer studied previously by our group. These results suggest that the high pressure sensitivity of the bi(anthracene-9,10-dimethylene) photodimer reaction is not just due to the presence of strained four-membered rings but instead relies on the unique molecular geometry of this molecule.
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Affiliation(s)
- Fei Tong
- Department of Chemistry, University of California Riverside , 501 Big Springs Road, Riverside, California 92521, United States
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11
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MacLeod KC, Patrick BO, Smith KM. Oxidatively Induced Reductive Elimination from a Chromium(III) Bis(aryl) Complex. Organometallics 2012. [DOI: 10.1021/om300751z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Cory MacLeod
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna,
British Columbia, Canada V1V 1V7
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
V6T 1Z1
| | - Kevin M. Smith
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna,
British Columbia, Canada V1V 1V7
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12
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Nakata N, Masubuchi S, Sekiguchi A. Spiro[2,5-dibenzo-1,4-disilacyclohexa-2,5-diene-1,7′-2′,5′- dibenzo-1′,4′,7′-trisilanorbornadiene]: Unusual Dimerization of Silyl-Substituted 9,10-Disila(Dewar Anthracene). PHOSPHORUS SULFUR 2010. [DOI: 10.1080/10426501003771385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Norio Nakata
- a Department of Chemistry, Graduate School of Pure and Applied Sciences , University of Tsukuba , Tsukuba, Ibaraki, Japan
| | - Sayaka Masubuchi
- a Department of Chemistry, Graduate School of Pure and Applied Sciences , University of Tsukuba , Tsukuba, Ibaraki, Japan
| | - Akira Sekiguchi
- a Department of Chemistry, Graduate School of Pure and Applied Sciences , University of Tsukuba , Tsukuba, Ibaraki, Japan
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13
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Chmiel J, Heesemann I, Mix A, Neumann B, Stammler HG, Mitzel NW. The Effect of Bulky Substituents on the Formation of Symmetrically Trisubstituted Triptycenes. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000354] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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MacLeod KC, Conway JL, Tang L, Smith JJ, Corcoran LD, Ballem KHD, Patrick BO, Smith KM. Reactivity Consequences of Steric Reduction in Cyclopentadienyl Chromium β-Diketiminate Complexes. Organometallics 2009. [DOI: 10.1021/om900788c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. Cory MacLeod
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7
| | - Julia L. Conway
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7
| | - Liming Tang
- Department of Chemistry, University of Prince Edward Island, 550 University Avenue, Charlottetown, PEI, Canada C1A 4P3
| | - Joshua J. Smith
- Department of Chemistry, University of Prince Edward Island, 550 University Avenue, Charlottetown, PEI, Canada C1A 4P3
| | - Liam D. Corcoran
- Department of Chemistry, University of Prince Edward Island, 550 University Avenue, Charlottetown, PEI, Canada C1A 4P3
| | - Katherine H. D. Ballem
- Department of Chemistry, University of Prince Edward Island, 550 University Avenue, Charlottetown, PEI, Canada C1A 4P3
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - Kevin M. Smith
- Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7
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15
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Mizuhata Y, Shinohara A, Tanabe Y, Tokitoh N. Cycloaddition Reactions of Kinetically Stabilized 9-Silaanthrancene with Polycyclic Aromatic Hydrocarbons. Chemistry 2009; 15:8405-8408. [DOI: 10.1002/chem.200901290] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Farrugia LJ, Evans C, Lentz D, Roemer M. The QTAIM Approach to Chemical Bonding Between Transition Metals and Carbocyclic Rings: A Combined Experimental and Theoretical Study of (η5-C5H5)Mn(CO)3, (η6-C6H6)Cr(CO)3, and (E)-{(η5-C5H4)CF═CF(η5-C5H4)}(η5-C5H5)2Fe2. J Am Chem Soc 2008; 131:1251-68. [DOI: 10.1021/ja808303j] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Louis J. Farrugia
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
| | - Cameron Evans
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
| | - Dieter Lentz
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
| | - Max Roemer
- WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K., and Institut für Chemie - Anorganische und Analytische Chemie, Fachbereich Biologie, Chemie, Pharmazie, Freie Universität, D-14195 Berlin, Germany
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17
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Fürstner A, Majima K, Martín R, Krause H, Kattnig E, Goddard R, Lehmann CW. A Cheap Metal for a “Noble” Task: Preparative and Mechanistic Aspects of Cycloisomerization and Cycloaddition Reactions Catalyzed by Low-Valent Iron Complexes. J Am Chem Soc 2008; 130:1992-2004. [PMID: 18197669 DOI: 10.1021/ja0777180] [Citation(s) in RCA: 251] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Keisuke Majima
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Rubén Martín
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Helga Krause
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Egmont Kattnig
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
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18
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Excited State Reactivity and Molecular Topology Relationships in Chromophorically Substituted Anthracenes. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/9780470133453.ch3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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19
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Lyssenko KA, Korlyukov AA, Golovanov DG, Ketkov SY, Antipin MY. Estimation of the Barrier to Rotation of Benzene in the (η6-C6H6)2Cr Crystal via Topological Analysis of the Electron Density Distribution Function. J Phys Chem A 2006; 110:6545-51. [PMID: 16706413 DOI: 10.1021/jp057516v] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The high-resolution X-ray diffraction analysis of the electron density distribution and plane-wave density functional theory has been applied to estimate the lattice energy and barrier to rotation of a benzene ring in the crystal of (eta(6)-C(6)H(6))(2)Cr. Experimental data made it possible to perform analysis of the metal-(pi-ligand) bond and estimate the nature and energy of weak H...H and H...C intermolecular interactions in the crystal. Summation of the intermolecular H...H and H...C interaction energies makes it possible to reproduce the experimental sublimation enthalpy value with high accuracy.
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Affiliation(s)
- Konstantin A Lyssenko
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 119991 Moscow, Russian Federation.
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20
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Scherer OJ, Vondung J, Wolmershäuser G. Tetraphosphacyclobutadiene as Complex Ligand. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.198913551] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Lambert C, von Ragué Schleyer P. Are Polar Organometallic Compounds “Carbanions”? The Gegenion Effect on Structure and Energies of Alkali-Metal Compounds. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.199411291] [Citation(s) in RCA: 174] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Shinohara A, Takeda N, Tokitoh N. Photochemical and thermal reactions of a kinetically stabilized 9-silaanthracene: the first spectroscopic observation of a 9,10-Dewar-9-silaanthracene isomer. J Am Chem Soc 2003; 125:10804-5. [PMID: 12952457 DOI: 10.1021/ja036106m] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A kinetically stabilized 9-silaanthracene (1) underwent unique photochemical and thermal reactions to afford 9,10-Dewar-9-silaanthracene 2a and the head-to-tail [4 + 4] dimer 3, respectively. The structure of 2a was confirmed by 1H, 13C, and 29Si NMR spectra, and the kinetic parameters for the thermal reversion of 2a to 1 were obtained by the measurement of UV/vis spectra. The dimer 3 was thermally stable, and the molecular structure of 3 was determined by X-ray crystallographic analysis. It was experimentally demonstrated for the first time that 9-silaanthracene, as well as anthracene, can afford either the Dewar isomer or [4 + 4] dimer, depending on the reaction conditions.
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Affiliation(s)
- Akihiro Shinohara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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23
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Avent AG, Hitchcock PB, Leigh G, Togrou M. The lithiation of arylamines and the preparation of cyclopentadienyltitanium(IV) arylaminate complexes. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(02)02222-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Desvergne JP, Bonneau R, Dörr G, Bouas-Laurent H. Photoprotodesilylation of 9-trimethylsilylanthracene in alcohols. Photochem Photobiol Sci 2003; 2:289-96. [PMID: 12713230 DOI: 10.1039/b210735j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It was found that the anomalous fluorescence quenching in methanol (as compared to other solvents) of 9-trimethylsilylanthracene (2) is accompanied by a chemical reaction leading to anthracene. This ipso substitution is due to a hydrogen bonding formation in the excited singlet state preceding the carbon-silicon bond cleavage. The mechanism was studied using stationary and dynamic fluorescence, laser flash photolysis and reactivity kinetics as a function of temperature. The kinetic parameters were determined for the formation of an intermediate "X" (A(X) approximately 2.5 x 10(11) s(-1) Ea(X) approximately 19.5 kJ mol(-1)) and for the global reaction (A(R) approximately 4 x 10(10) s(-1) and Ea(R) approximately 19.2 kJ mol(-1)), indicating that, after the formation of X, the reaction does not involve any step with an activation energy larger than 19 kJ mol(-1). The intermediate X undergoes partitioning between the product (a approximately 0.18) and the starting material. The isotopic effect for the quenching by methanol was found to be kX(H)/kX(D) approximately 1.9, in keeping with the proposed protonation in the excited singlet state (S1). The reactivity ratio between the S1 state and the ground state, kR(S1)/ kR(S0) approximately 10(12) is in line with those observed by other authors. This unusual photoreaction can proceed for 2 with other alcohols. ipsoProtodesilylation of aromatic silanes are known to occur in the ground state but in acidic media.
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Affiliation(s)
- Jean-Pierre Desvergne
- Laboratoire de Chimie Organique et Organométallique, UMR 5802 CNRS, Université Bordeaux 1, 351 Cours de la Libération 33405, Talence Cedex, France.
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Gopalan RS, Kulkarni GU. An investigation of the photo-reactive and unreactive polymorphs ofo-ethoxy cinnamic acid and of its photodimer. J CHEM SCI 2001. [DOI: 10.1007/bf02708650] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abramov YA, Brammer L, Klooster WT, Bullock RM. Experimental Charge Density and Neutron Structural Study of cis-HMn(CO)4PPh3: Comprehensive Analysis of Chemical Bonding and Evidence for a C−H···H−Mn Hydrogen Bond. Inorg Chem 1998. [DOI: 10.1021/ic9809660] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuriy A. Abramov
- Department of Chemistry, University of MissouriSt. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121-4499, and Chemistry Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000
| | - Lee Brammer
- Department of Chemistry, University of MissouriSt. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121-4499, and Chemistry Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000
| | - Wim T. Klooster
- Department of Chemistry, University of MissouriSt. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121-4499, and Chemistry Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000
| | - R. Morris Bullock
- Department of Chemistry, University of MissouriSt. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121-4499, and Chemistry Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000
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Ciunik Z. Relationship between electron difference-density distribution, planarity of the >N–O groups and intermolecular hydrogen bond systems in crystals of stable nitroxide radicals. J Mol Struct 1997. [DOI: 10.1016/s0022-2860(97)00010-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cowley AH, Decken A, Norman NC, Krüger C, Lutz F, Jacobsen H, Ziegler T. Electron Density Distribution in Diphosphenes and the Nature of the Phosphorus−Phosphorus Double Bond: Experimental and Theoretical Studies. J Am Chem Soc 1997. [DOI: 10.1021/ja9627510] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alan H. Cowley
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
| | - Andreas Decken
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
| | - Nicholas C. Norman
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
| | - Carl Krüger
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
| | - Frank Lutz
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
| | - Heiko Jacobsen
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
| | - Tom Ziegler
- Department of Chemistry and Biochemistry The University of Texas at Austin Austin, Texas 78712 School of Chemistry, The University of Bristol Bristol, BS8 1TS, U.K. Max-Planck-Institut für Kohlenforschung 45470 Mülheim an der Ruhr, FRG Department of Chemistry, University of Calgary Calgary, Alberta, Canada, T2N IN4
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Port A, Moragas M, Sánchez-Ruiz X, Jaime C, Virgili A, Alvarez-Larena A, Piniella JF. Synthesis and Separation of Atropisomers of 9,10-Dipivaloylanthracene and 9,10-Bis(1-imino-2,2-dimethylpropyl)anthracene. Structural Study by NMR, Molecular Mechanics, and X-ray Diffraction. J Org Chem 1997. [DOI: 10.1021/jo961166e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Port
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
| | - M. Moragas
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
| | - X. Sánchez-Ruiz
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
| | - C. Jaime
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
| | - A. Virgili
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
| | - A. Alvarez-Larena
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
| | - J. F. Piniella
- Unitat de Química Orgànica, Departament de Química, and Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
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Antipin M, Lyssenko K, Boese R. Electron density distribution in the vanadocene crystal on the basis of X-ray diffraction data at 108 K. J Organomet Chem 1996. [DOI: 10.1016/0022-328x(95)05876-q] [Citation(s) in RCA: 16] [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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Lambert C, von Ragué Schleyer P. Sind polare Organometallverbindungen “Carbanionen”? Der Einfluß des Gegenions auf Struktur und Energie von Organoalkalimetallverbindungen. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061104] [Citation(s) in RCA: 125] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kazmina NB, Antipin MY, Sereda SV, Struchkov YT, Mysov EI, Leites LA. Thermal reactions of hexafluoro-1,3-butadiene. Part I. Primary products and their thermal transformations. J Fluor Chem 1993. [DOI: 10.1016/s0022-1139(00)80417-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Siebert W. Di- and Trinuclear Metal Complexes of Diboraheterocycles. ADVANCES IN ORGANOMETALLIC CHEMISTRY 1993. [DOI: 10.1016/s0065-3055(08)60491-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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Scherer OJ. Komplexe mit substituentenfreien acyclischen und cyclischen Phosphor-, Arsen-, Antimon- und Bismutliganden. Angew Chem Int Ed Engl 1990. [DOI: 10.1002/ange.19901021006] [Citation(s) in RCA: 142] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Herberich GE, Hausmann I, Klaff N. The 30-Electron Rule for Triple-Decker Complexes -Vanadium, Niobium and Tantalum Complexes as Illustrative Examples. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/anie.198903191] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Herberich GE, Hausmann I, Klaff N. Die 30-Elektronenregel der Tripeldeckerkomplexe – Belegbeispiele mit Vanadium, Niob und Tantal. Angew Chem Int Ed Engl 1989. [DOI: 10.1002/ange.19891010316] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Wang Y, Ueng CH, Lee L, Chuang M, Lepage Y, Gabe E. Deformation Density Study of KMnO 4. J CHIN CHEM SOC-TAIP 1989. [DOI: 10.1002/jccs.198900008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Irngartinger H, Kallfaß D, Prinzbach H, Klingler O. Deformation Density of acis,cis-Trialkyltriaziridine. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/cber.19891220127] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Seebach D. Structure and Reactivity of Lithium Enolates. From Pinacolone to SelectiveC-Alkylations of Peptides. Difficulties and Opportunities Afforded by Complex Structures. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/anie.198816241] [Citation(s) in RCA: 680] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Seebach D. Struktur und Reaktivität von Lithiumenolaten, vom Pinakolon zur selektivenC-Alkylierung von Peptiden – Schwierigkeiten und Möglichkeiten durch komplexe Strukturen. Angew Chem Int Ed Engl 1988. [DOI: 10.1002/ange.19881001206] [Citation(s) in RCA: 274] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Dunitz JD, Maverick EF, Trueblood KN. Atomic Motions in Molecular Crystals from Diffraction Measurements. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/anie.198808801] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Pant AK, Stevens ED. Experimental electron-density-distribution study of potassium iron disulfide, a low-dimensional material. PHYSICAL REVIEW. B, CONDENSED MATTER 1988; 37:1109-1120. [PMID: 9944617 DOI: 10.1103/physrevb.37.1109] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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