Fullerene cation-mediated demethylation/cyclization to give 5- and 7-membered cyclo[60]fullerene derivatives

Yutaka Matsuo, Keisuke Ogumi, Ying Zhang, Hiroshi Okada, Takafumi Nakagawa, Hiroshi Ueno, Akiko Gocho, Eiichi Nakamura

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14 Citations (Scopus)


Single-bonded fullerene dimers, (C60R)2 (R = (2-methoxyphenyl)dimethylsilylmethyl, (isopropoxy)dimethylsilylmethyl, and 2-methoxy-5-methylphenyl), afforded fullerene derivative cations (RC60+) in the presence of an oxidant (I2, CuCl2, or CuBr2), leading to 5- and 7-membered cyclo[60]fullerene derivatives such as cyclo[60]fullerenes containing a Si-O bond, cyclo[60]fullerenes containing a C60-O bond, and dihydrobenzofurano[60]fullerene. The reaction mechanism involved thermal homolytic cleavage to give fullerene radicals, oxidation of the radicals to generate fullerene cations, and then demethylative cyclization in which the fullerene cationic centers interact with an aromatic group or the oxygen atoms of methoxy groups to produce the cyclized products. The obtained cyclo[60]fullerene derivatives were used in bulk-heterojunction organic solar cells and showed moderate power conversion efficiency and respectable open-circuit voltage.

Original languageEnglish
Pages (from-to)2774-2783
Number of pages10
JournalJournal of Materials Chemistry A
Issue number6
Publication statusPublished - 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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