Cf. Chen et al., REGIOSELECTIVE FORMATION OF DIAZAFULLEROIDS BRIDGED BY GLYCOL DIACETATE AND GLYCOL CHAINS, Synthetic communications, 28(16), 1998, pp. 3097-3103
Five diazafulleroids with neighbouring double 5, 6-insertion were regi
oselectively synthesized by the reactions of C-60 with ethylene, dieth
ylene, triethylene glycol di(2-azideacetates) and diethylene, triethyl
ene glycol diazides in refluxing chlorobenzene.