Isoprene, resonance energy

On the basis of this mechanism the difference in the energy of activation for the decomposition to isoprene and that for the decomposition of isopropylcyclobutane to 3-methylbutene-l should equal the allyl radical resonance energy. The value obtained in this fashion is 11-6 +1 kcal mole in close agreement with the values obtained by other methods. 

Guo and Castleman s value for the bond enthalpy is consistent with their value for equation 19. Chen and Armentrout s value is consistent with other values in their paper (see Table 5 for a collection of these and other values). From analysis of radiative association kinetics of their Fourier transform ion cyclotron resonance results, Klippenstein, Dunbar and their coworkers46 derived first Ag+ 2-pentene and isoprene binding energies of (154 29) and (174 29) kJmol-1, and second energies of (164 29) and... 

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