期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 5, 页码 1660-1667出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b12054
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资金
- National Science Foundation of U.S.A. [CHE-1361104]
- NSF [OCI-1053575]
- Direct For Mathematical & Physical Scien [1361104] Funding Source: National Science Foundation
- Division Of Chemistry [1361104] Funding Source: National Science Foundation
The cycloadditions of benzene and ten different azabenzenes (pyridine, three diazines, three triazines, and three tetrazines) with the ethylene dienophile have been explored with density functional theory (M06-2X) and analyzed with the distortion/interaction model. Activation barriers correlate closely with both distortion energies and interaction energies over an activation energy range of 45 kcal/mol. The replacement of CH with N increases Diels-Alder reactivity due not only to the more favorable orbital interaction, but also to a decrease in distortion energy. The rates of reactions are greatly influenced by the nature of the bonds being formed: two C-C bonds > one C-C bond, and one C-N bond > two C-N bonds. The activation energy of Diels-Alder reactions correlates very well with reaction energies and with the NICS(0) values of the aromatic dienes. The distortion energy of the Diels-Alder reaction transition states mostly arises from the diene out-of-plane distortion energy.
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