Synthesis of Open‐Cage [60]Fullerenes with Five Carbonyl Groups on the Rim of the 15‐Membered Orifice

Abstract

A new type of open‐cage [60]fullerene was prepared starting from our previously reported open‐cage [60]fullerenes containing hydroxy and tert‐butylperoxo groups, and an iminofuranone moiety on the rim of the orifice. The key reactions are alcoholysis with MeOH/PCl5 and reductive aromatization with SnCl2 or HI (aq). The resulting open‐cage compound contains two ketone carbonyls, two amide carbonyls, and one ester carbonyl group. The X‐ray crystal structure of the precursor compound shows that the 18‐membered orifice is almost completely blocked because of the presence of the amide group directly above the orifice.