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Deslongchamps P. A new mechanism for the thermal and photochemical Diels-Alder cycloaddition based on the bent bond / antiperiplanar hypothesis orbital model. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Santos JC, Andres J, Aizman A, Fuentealba P. An Aromaticity Scale Based on the Topological Analysis of the Electron Localization Function Including σ and π Contributions. J Chem Theory Comput 2015; 1:83-6. [PMID: 26641119 DOI: 10.1021/ct0499276] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, the average bifurcation value of the electron localization function (ELF) of both σ (ELFσ) and π (ELFπ) contributions was used to construct an aromaticity scale for chemical compounds. We have validated the scale with a series of well-known molecules and then used it to evaluate global aromaticity on aluminum based clusters, which present σ aromaticity and π antiaromaticity. The proposed scaled predicts an overall antiaromatic character for the Al4(4)(-) moiety.
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Affiliation(s)
- Juan C Santos
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
| | - Juan Andres
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
| | - Arie Aizman
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
| | - Patricio Fuentealba
- Departamento de Química, Universidad Técnica Federico Santa Maria, Casilla 110V, Valparaíso, Chile, Departament de Ciències Experimentals, Universitat Jaume I, Apartat 224, 12080, Castelló, Spain, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago, Chile
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Kozielewicz P, Tzeli D, Tsoungas PG, Zloh M. Arene-fused 1,2-oxazole N-oxides and derivatives. The impact of the N–O dipole and substitution on their aromatic character and reactivity profile. Can it be a useful structure in synthesis? A theoretical insight. Struct Chem 2014. [DOI: 10.1007/s11224-014-0459-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bent bonds and the antiperiplanar hypothesis as a simple model to predict Diels–Alder reactivity: retrospective or perspective? Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Deslongchamps G, Deslongchamps P. Bent bonds, the antiperiplanar hypothesis and the theory of resonance. A simple model to understand reactivity in organic chemistry. Org Biomol Chem 2011; 9:5321-33. [DOI: 10.1039/c1ob05393k] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Krygowski TM, Stepień BT. Sigma- and pi-electron delocalization: focus on substituent effects. Chem Rev 2005; 105:3482-512. [PMID: 16218559 DOI: 10.1021/cr030081s] [Citation(s) in RCA: 266] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Cyrański MK. Energetic aspects of cyclic pi-electron delocalization: evaluation of the methods of estimating aromatic stabilization energies. Chem Rev 2005; 105:3773-811. [PMID: 16218567 DOI: 10.1021/cr0300845] [Citation(s) in RCA: 468] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Herndon WC, Mills NS. Aromatic Stabilization Energy Calculations for the Antiaromatic Fluorenyl Cation. Issues in the Choice of Reference Systems for Positively Charged Species. J Org Chem 2005; 70:8492-6. [PMID: 16209597 DOI: 10.1021/jo051289b] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aromatic stabilization energy (ASE) calculations for the fluorenyl cation show substantial destabilization in comparison to suitable reference systems (16.3 +/- 1.6 kcal/mol), supporting its categorization as an antiaromatic species. The choice of appropriate reference systems is exacting for cationic systems because of the need to match strain energies, convolved with allylic-type resonance terms and other potential structural effects that stabilize charge. Several homodesmotic ASE reaction systems are examined to demonstrate the role played by these factors in the calculation of an ASE value for the fluorenyl cation. The magnitudes of the derived ASE are quite similar for four very different determinative, homodesmotic reaction systems, giving strong support to the inherent accuracy of the final derived ASE value. The results of nucleus independent chemical shift calculations for the components of each one of the ASE reactions add additional weight to this conclusion.
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Affiliation(s)
- William C Herndon
- Department of Chemistry, University of Texas, El Paso, Texas, 79968, USA.
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