The fullerene fragment 1 (C28H14) gives a paratropic dianion and a diatropic tetraanion on alkali metal reduction, whereas the C30H14 hydrocarbon 2, which contains just one more ring from the C60 network, gives a diatropic dianion and a paratropic tetraanion.
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Weitz et al. (1998) studied this question.