Mf. Meidine et al., FORMATION AND STABILIZATION OF THE HEXA-CYCLOPENTADIENE ADDUCT OF C-60, Journal of the Chemical Society, Chemical Communications, (17), 1993, pp. 1342-1344
Up to 6 equiv. of cyclopentadiene react with C60, and the resulting Di
els-Alder adducts can be stabilised towards degradation during mass sp
ectrometric analysis by hydrogenation of the pendant bicyclopentene mo
ieties; stabilisation can also be affected by bromination.