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The electronic “umpolung” of the title compound 1 to the dianion 2 is achieved by the uptake of four electrons from potassium in THF. Although the ring skeleton of the 18π 1 deviates significantly from planarity because of the streric requirements of the four selenium atoms, the new macrocycle fulfils the NMR criteria for aromaticity.
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Vogel et al. (1997) studied this question.
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