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An overall yield of 35% based on C60 was obtained in the synthesis of hexaadduct 1. First, bis- and trisadducts of C60 were prepared regiospecifically by tether-directed remote functionalization. Further functionalization of the trisadduct via a single tetraadduct gave the pseudooctahedral hexaadduct 1 regiospecifically. All intermediates were isolated in pure form without the use of tedious, scale-limiting HPLC methods.
Isaacs et al. (Mon,) studied this question.