Abstract
Despite the shielding caused by two negative charges, the resonance signals of H1, H7, H9 and H15 in the 1H NMR spectrum of the dianion of 1 occur at lower field than in the spectrum of the corresponding dication. This behavior may be understood on the basis of HMO calculations, which predict diamagnetic ring currents along the periphery of the dianion 12⊖, but weak paramagnetic ring currents in the central s-indecene unit and the terminal benzene rings of dication 12⊕.
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