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 +
Factors affecting the endo : exo ratio in diels-alder reactions of cyclopentadiene
โ Scribed by John R. Lindsay Smith; Richard O.C. Norman; Michael R. Stillings
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- French
- Weight
- 207 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0040-4020
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๐ SIMILAR VOLUMES
The endo/exo stereoselectivity of the Diels-Alder cycloaddition between cyclopentadiene and 3-crotonoyl-2-oxazolidinone catalysed by Et 2 AlCl is temperature-and solvent-dependent. Eyring plots of ln(endo/exo) versus 1/T show different inversion temperatures (T inv ) depending on the reaction solven
Abstraci: The endolexo selecttviry of Diels-Alder reactions tn water and methanol is studied with semiempirical methods using the SCRF approach and a combined quantum chemical (transition state) and molecular mechanics (solvent molecules) method lQCIMA4) to determine the effect of protic solvents on