X-Ray crystallographic analysis of a 1:1 adduct of C60 and 4,5-dimethoxybenzyne exhibited a benzocyclobutene structure given by [2+2] cycloaddition reaction at a 6,6-ring junction. A fullerene C(sp3)-C(sp3) bond length is 1.645(8) Å. Relatively short intermolecular C···C, C···O, and C···S distances were found, where sulfur atoms belong to CS2 molecules enclosed.
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Ishida et al. (1995) studied this question.
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