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endo- and exo-Stereochemistry in the Diels-Alder Reaction: Kinetic versus Thermodynamic Control

✍ Scribed by Cooley, James H.; Williams, Richard Vaughan

Book ID
111679257
Publisher
American Chemical Society
Year
1997
Tongue
English
Weight
94 KB
Volume
74
Category
Article
ISSN
0021-9584

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πŸ“œ SIMILAR VOLUMES

Endo and exo transition states in the Di
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We have recently determined kinetic parameters for the unimolecular Diels-Alder retrogressions of exe and w-dicyclopentadiene to monomer (1). The activation enthalpies and entropies are aH f (E) 37.4 2 0.3 kcal/mole, hSS (E) + 1.1 2 0.6 e.u., hH + (&) 33.0 2 0.5 kcal/mole, and hSS (endo) \_ -1.9 +

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## Abstract __Herein we demonstrate that an external electric field (EEF) acts as an accessory catalyst/inhibitor for Diels–Alder (DA) reactions. When the EEF is oriented along the β€œreaction axis” (the coordinate of approach of the reactants in the reaction path), the barrier of the DA reactions is