Journal
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM
Volume 819, Issue 1-3, Pages 72-78Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.theochem.2007.05.026
Keywords
Diels-Alder reaction; transtion state; aromaticity; strain energy
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The symmetry of the Diels-Alder transition state depends on the interplay of orbital interactions, aromaticity, which favors a C(s) structure, and strain, which tends to break symmetry. Twenty Diels-Alder reactions are examined at MP4SDTQ/6-312G(d)//B3LYP/ 6-31G(d). The substituents utilized are alkyl groups in order to minimize the effect of orbital interactions. The underlying assumptions are examined and appropriate caveats discussed. These computations provide, as a first approximation, an estimate of 10 kcal mol(-1) for the aromatic stabilization energy in the Diels-Alder TS. (C) 2007 Elsevier B.V. All rights reserved.
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