See Activation energie energies

Energy of activation, see activation energy Enhancement factor, see Faradaic efficiency Enthalpy... 

In summary, the hydrogen bond pattern of the catalyst disfavors some principally possible arrangements due to steric interactions, and others due to a lack of charge distribution and charge stabilization. In this example, re(R)ts remains as the only favored transition state (see activation energies in Fig. 3). 

Energies, Activation. See Activation Energies in Vol 1 of EncycL, p AlOl-L... 

Line No. Pyrimidine substituents Nucleophile in 99.8% EtOH Rate constant (temp. C) 10 k liter mole" see" Activation energy kcal mole" Entropy of activation cal mole" deg- Frequency factor logic A Ref. 

Gas phase kinetic data have been reported for only two of these reaction subclasses, allyl esters (2), and vinyl allyl ethers (4). Subclasses (5), (6) and (1) have very fast reverse processes (see activation energy predictions), but could be observed in terms of loss of optical activity at the 4-position. It would be interesting to look for these reactions. 

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