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A fullerene urethane, C60NCO2CH2CH3, was obtained by a one-pot reaction from C60, NaN3, ClCO2CH2CH3, and 15-crown-5 ether in refluxing toluene. The structure of the product was spectroscopically determined as a closed aziridine at a 6/6-ring junction.
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Ishida et al. (1994) studied this question.
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