Open-cage fullerene derivatives having 11-, 12-, and 13-membered-ring orifices: chemical transformations of the organic addends on the rim of the orifice.

A novel open-cage [60]fullerene derivative, having two sulfur atoms on the rim of its 13-membered-ring orifice, has been isolated and characterized. Extensive studies on the N-MEM group reactivity of this as well as other previously reported open-cage [60]fullerene derivatives led to several new open-cage [60]fullerene adducts.