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Two new 6,6-open phenyl-C(81)-butyric acid methyl ester metallofulleroids, M(3)N@C(80)PCBM (M = Sc, Y), were synthesized by diazoalkane addition reactions and fully characterized. The results demonstrate that the reactive sites are the same for M(3)N@C(80) (M = Sc, Y) but dramatically different from that of C(60).
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Shu et al. (2009) studied this question.
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