Abstract
The ionization potential of several alkyl-substituted aromatics have been measured by an electron impact method, and the results are found to agree with values predicted by equivalent orbital calculations. The appearance potential of several alkyl-substituted benzyl ions have been measured, and the results show that the energies of these ions are independent of ring substitution. The appearance potential of several alkyl-substituted phenyl ions were measured, and the results appear to be anomalous. The results can be understood if it is assumed that the ions rearrange during decomposition to the isomeric benzyl ions. The implications of these results in terms of several chemical reactions are discussed. The heat of formation of the phenyl and ethyl phenyl radicals were found to be approximately 66 and 49 kcal/mole, respectively.
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