| Abstract
| - A thermal reaction of fullerene C60 with 4,6-dimethyl-1,2,3-triazine (4) in o-dichlorobenzene gaveazacyclohexadiene-fused fullerene derivative 5, by the reaction with intermediate azete 11, andthen, after flash chromatography over SiO2, open-cage fullerene derivative 6 having an eight-membered ring orifice on the C60 cage. Compound 6 is assumed to be formed via addition of diradicalintermediate 13 to C60. Compound 6 underwent a further photochemical reaction with singlet oxygenwith the cleavage of one of the double bonds at the rim of the orifice to afford triketone derivative8 having a 12-membered ring orifice.
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