The aromaticity of the benzene nucleus is essentially retained when 1 is oxidized to 14⊕. This was revealed by comparison of experimental and calculated structural parameters, which are best in agreement with the resonance structure shown on the right for 14⊕. The triplet ground state which, in principle, is conceivable for 14⊕ was, however not found.
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Dixon et al. (1989) studied this question.
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