The ESR spectrum of the tropone anion radical has been examined. The radical was generated from the neutral species by the electrolytic reduction in N,N-dimethylformamide. Splitting constants are satisfactorily explained in terms of the calculated spin densities by the McLachlan procedure, confirming that the unpaired spin orbital belongs to an a2 symmetrical species. The complete delocalization of the π-electrons was assumed for the anion radical.
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Ikegami et al. (1972) studied this question.
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