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Pentamethyl-monohydro[60]fullerene C60Me5H has been synthesized through five-fold addition of methylcopper reagent to C60. The anion C60Me5− generated by deprotonation of C60Me5H forms organometallic complexes with K+ and Tl+ ions with stronger metal-carbon interaction than that in the corresponding pentaphenylated ligand C60Ph5−.
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Sawamura et al. (2000) studied this question.
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