J. Averdung et al., PROGRESS IN FULLERENE CHEMISTRY - FROM EXOHEDRAL FUNCTIONALIZATION TOHETEROFULLERENES, Fullerene science and technology, 4(4), 1996, pp. 633-654
Various types of cycloaddition such as [2+1], [2+3], and Diels-Alder r
eactions have been investigated for the purpose of exohedral functiona
lization of [60]fullerene and also in few cases of [70]fullerene. Ther
mal and photochemical activation have been used and lead to a variety
of new fullerene derivatives which may be further functionalizable. In
addition, a new approach to aza-heterofullerenes has been developed s
tarting from an exohedrally activated fullerene.