Do Secondary Orbital Interactions Really Exist?
- 23 June 2000
- journal article
- Published by American Chemical Society (ACS) in Accounts of Chemical Research
- Vol. 33 (10) , 658-664
- https://doi.org/10.1021/ar0000152
Abstract
A revision of the most typical examples used to illustrate the existence of secondary orbital interactions (SOI) has been achieved. However, our analysis indicates that no conclusive evidence can be obtained from these cases. All five examples proposed by Woodward and Hoffmann in The Conservation of Orbital Symmetry have been revisited. A combination of well-known mechanisms (such as solvent effects, steric interactions, hydrogen bonds, electrostatic forces, and others) can be invoked instead to justify the endo/exo selectivity of Diels-Alder reactions.Keywords
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