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5
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Fattahi A, Lis L, Tehrani ZA, Marimanikkuppam SS, Kass SR. Experimental and Computational Bridgehead C–H Bond Dissociation Enthalpies. J Org Chem 2012; 77:1909-14. [DOI: 10.1021/jo202519w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Alireza Fattahi
- Department
of Chemistry, Sharif University of Technology, Tehran, Iran
| | - Lev Lis
- Department
of Chemistry, University of Minnesota,
Minneapolis, Minnesota 55455,
United States
| | - Zahra A. Tehrani
- Department
of Chemistry, Sharif University of Technology, Tehran, Iran
| | | | - Steven R. Kass
- Department
of Chemistry, University of Minnesota,
Minneapolis, Minnesota 55455,
United States
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7
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Pariya C, Marcos YS, Zhang Y, Fronczek FR, Maverick AW. Organosilicon-Based Multifunctional β-Diketones and their Rhodium and Iridium Complexes. Organometallics 2008. [DOI: 10.1021/om701233a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chandi Pariya
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Yoseph S. Marcos
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Yixun Zhang
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Andrew W. Maverick
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
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8
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Sackers E, Osswald T, Weber K, Keller M, Hunkler D, Wörth J, Knothe L, Prinzbach H. Bromination of Unsaturated Dodecahedranes—En Route to C20 Fullerene. Chemistry 2006; 12:6242-54. [PMID: 16927320 DOI: 10.1002/chem.200501609] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
As part of a study to achieve selective oligo(poly)bromination-ultimately perbromination-of the dodecahedral C(20) skeleton, the extent and direction of the ionic bromination of dodecahedrene and 1,16-dodecahedradiene were explored. Along sequences of Br(+) additions/deprotonations and allylic rearrangements, up to ten hydrogen atoms were substituted (traces of C(20)H(x)Br(10)). Tetrabromododecahedrenes obtained under defined conditions in up to 50 % total yield with three and four allylic bromine substituents protecting the extremely bent C==C bonds, proved highly unreactive even towards oxygen but reacted rapidly with CH(2)N(2). Upon electron impact ionization (MS) of the newly secured oligo(poly)bromododecahedra(e)nes, sequential loss of the substituents ended generally in polyunsaturated dodecahedranes (in the extreme C(20)H(4), "tetrahydro-C(20) fullerenes"). Only subsequently did skeletal fragmentations occur. From X-ray crystal-structure analyses, more information was obtained on the structural response of the dodecahedral skeleton to the strain induced by the voluminous substituents. As Appendix, the forcing radical bromination of 1,6-dibromododecahedrane and exploratory cis-beta-HBr/cis-beta-Br(2) eliminations in bromododecahedranes with [Fe(2)(CO)(9)], P(2)F/[FeCp(2)] and [Fe(tmeda)Cp*Cl] (in situ protection) are presented.
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Affiliation(s)
- Emmerich Sackers
- Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
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9
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Krouse IH, Wenthold PG. Fluorotrimethylsilane affinities of anionic nucleophiles: a study of fluoride-induced desilylation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2005; 16:697-707. [PMID: 15862771 DOI: 10.1016/j.jasms.2005.01.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2004] [Revised: 01/13/2005] [Accepted: 01/13/2005] [Indexed: 05/24/2023]
Abstract
In this study, preparation and decomposition of five novel pentavalent fluorosiliconates, RSi(CH3)3F- (R = CH3CH2O, CF3CH2O, (CH3)2CHO, (CH3)3SiO, and (CH3)3SiNH) is used to investigate the process of fluoride-induced desilylation. The siliconates were characterized by collision-induced dissociation and energy-resolved mass spectrometry. Decomposition of RSi(CH3)3F- leads to loss of the nucleophile R- and FSi(CH3)3, except in the case of (CH3)3SiNHSi(CH3)3F-, where HF loss is also observed. Ion affinities for FSi(CH3)3 have been measured for all five nucleophiles, and compare well with computational predictions. The observed trend of the bond dissociation energies resembles the trend of deltaH(acid) values for the corresponding conjugate acids, RH. Additionally, this data has been incorporated with existing thermochemistry to derive fluoride affinities for four of the silanes (R = CH3CH2O, (CH3)2CHO, (CH3)3SiO, and (CH3)3SiNH). We use the fluoride affinity of the silanes and the FSi(CH3)3 affinity of the departing nucleophilic anion to assess the feasibility of fluoride-induced desilylation of the silanes examined in this work.
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Affiliation(s)
- Ian H Krouse
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA
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10
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Chen Z, Jiao H, Moran D, Hirsch A, Thiel W, Schleyer PVR. Structures and Stabilities of Endo- and Exohedral Dodecahedrane Complexes (X@C20H20 and XC20H20, X = H+, H, N, P, C-, Si-, O+, S+). J Phys Chem A 2003. [DOI: 10.1021/jp0273631] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhongfang Chen
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Computational Chemistry Annex, University of Georgia, Athens, Georgia 30602-2525, Department of Chemistry, Shanxi Normal University, 041004 Linfen, P. R. China, Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany, and Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
| | - Haijun Jiao
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Computational Chemistry Annex, University of Georgia, Athens, Georgia 30602-2525, Department of Chemistry, Shanxi Normal University, 041004 Linfen, P. R. China, Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany, and Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
| | - Damian Moran
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Computational Chemistry Annex, University of Georgia, Athens, Georgia 30602-2525, Department of Chemistry, Shanxi Normal University, 041004 Linfen, P. R. China, Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany, and Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
| | - Andreas Hirsch
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Computational Chemistry Annex, University of Georgia, Athens, Georgia 30602-2525, Department of Chemistry, Shanxi Normal University, 041004 Linfen, P. R. China, Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany, and Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
| | - Walter Thiel
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Computational Chemistry Annex, University of Georgia, Athens, Georgia 30602-2525, Department of Chemistry, Shanxi Normal University, 041004 Linfen, P. R. China, Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany, and Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
| | - Paul von Ragué Schleyer
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany, Computational Chemistry Annex, University of Georgia, Athens, Georgia 30602-2525, Department of Chemistry, Shanxi Normal University, 041004 Linfen, P. R. China, Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany, and Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
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