Hyperconjugative stabilization in Diels-Alder re:lction< of 5-substituted cyclopentadienes by o-bonds antiperiplanar to the bond forming centers hii'; recently been proposed to account for the observed facial selectivity.1 The explanation was first propostd by CizplakZ to ;~ccount for the directing
✦ LIBER ✦
Reexamination of orbital interactions in Diels–Alder reactions
✍ Scribed by Atsushi Ogawa; Hiroshi Fujimoto
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- French
- Weight
- 133 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
An application of the perturbation theory to the [4+2] addition of butadiene has demonstrated that the effect of secondary orbital interactions should be much less significant than has been assumed within the frontier orbital scheme. This has been confirmed by a numerical analysis with respect to the endo transition state of the Diels-Alder reaction between butadiene and maleic anhydride.
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