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Keywords:

  • carbon allotropes;
  • cyclo-Cn compounds;
  • fullerenes
Thumbnail image of graphical abstract

Cyclic fullerene–acetylene hybrids, a tris(fullerene)-cyclo-C15 (1) and a tetrakis(fullerene)-cyclo-C20 compound (2), were synthesized by Eglinton–Glaser coupling. Both oligomers fragment under MALDI-TOF MS conditions to give sequential loss of the C60 units, which potentially provides controlled access to the hitherto unknown free ions cyclo-Cmath image and cyclo-Cmath image. X = (EtO2CCH2O2C)2C.