| Abstract
| - A theoretical analysis of transition state stabilization in D−A reactions of substituted dienes according tothe nature and position of the substituent has been carriedon. Results revealed that substituents (de)stabilize TSthrough four effects (steric, mesomeric, inductive, and polarizability) acting principally by favoring the electronictransfer between the two partners. The correlations observedpoint out nevertheless that the reactivity of substituteddienes in [4 + 2] cycloadditions on ethylene may principallybe predicted by the sole use of the F + R electronicparameters.
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