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Evidence of volume contraction in the transition state of the diels alder reaction

✍ Scribed by Kazuyoshi Seguchi; Akira Sera; Kazuhiro Maruyama


Publisher
Elsevier Science
Year
1973
Tongue
French
Weight
173 KB
Volume
14
Category
Article
ISSN
0040-4039

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✦ Synopsis


In the Diels Alder reactron the adduct with the endo conflguratlon ~3, m general,

  1. much preferred over the adduct having the exo conflguratlon. wooaward

πŸ“œ SIMILAR VOLUMES


Endo and exo transition states in the Di
✍ William C. Herndon; Lowell H. Hall πŸ“‚ Article πŸ“… 1967 πŸ› Elsevier Science 🌐 French βš– 278 KB

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 +

A transition state FMO approach for pred
✍ P.V. Alston; R.M. Ottenbrite; O.F. Guner; D.D. Shillady πŸ“‚ Article πŸ“… 1986 πŸ› Elsevier Science 🌐 French βš– 287 KB

crease in the importance of these resonances structures in the transition state is more likely because of the greater double bond character between the inner carbon atoms which enhances other ionic resonance. Thus, no change or a slight decrease CH+ h -.\*1.46 -1.46

The STO-3G transition structure of the d
✍ Frank K Brown; K.N Houk πŸ“‚ Article πŸ“… 1984 πŸ› Elsevier Science 🌐 French βš– 260 KB

A transition structure with CS symmetry for the Diels-Alder reaction of butadiene with ethylene has been obtained with the STO-3G basis set. Stereochemical consequences are discussed. The Di&-Alder reaction of butadiene with ethylene has been studied by both ab initio',2 and a variety of -\_\_ semi-

Inter- and intramolecularhetero diels-al
✍ Tietze, Lutz F. ;Brumby, Thomas ;Brand, Siegbert ;Bratz, Matthias πŸ“‚ Article πŸ“… 1988 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 784 KB

The intramolecular hetero Diels-Alder reaction of heterodienes 13 is described. The heterodienes, which are obtained in situ by Knoevenagel condensation of aldehydes 129 -e with dimethylbarbituric acid (2), yield the cycloadducts 14a-e/15a-e and the ene adducts 169, c-e/17a, c-e. The ratio of 14/15