Pentadienyl radical, resonance energy

The activation energy is only 7 kcal/mol less than that for the vinylcyclopropane rearrangement itself, consistent with roughly 20 kcal/mol for the pentadienyl radical resonance energy, and suggests that the reaction is not concerted. 

D.F. McMiUen and D.M. Golden, Cyclohexadienyl radical resonance energy is 7 kcal/ mol greater than that of the pentadienyl radical from bond dissociation energies, Anna. Rev. Phys. Chem., 33, 493 (1982). 

Sketch the molecular orbitals for the pentadienyl system in order of ascending energy (see Figures 14-2 and 14-7). Indicate how many electrons are present, and in which orbitals, for (a) the radical (b) the cation (c) the anion (see Figures 14-3 and 14-7). Draw all reasonable resonance forms for any one of these three species. 

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