title: Synthesis, structure, and aromaticity of a hoop-shaped cyclic benzenoid [10]cyclophenacene.
abstract: The first hoop-shaped cyclic benzenoid compounds, [10]cyclophenacene derivatives that contain 40 pi electrons, have been synthesized in three or four steps from [60]fullerene by rationally designed chemical modification. The compounds thus synthesized are chemically stable, yellow-colored, luminescent, and EPR-silent. X-ray crystallographic analysis provided high precision structural data sets. On the basis of these results and theoretical investigations, the new cyclic benzenoid molecules were proven to be aromatic.
authors.affiliation: Department of Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. nakamura@chem.s.u-tokyo.ac.jp
authors.forename: Eiichi
authors.initials: E
authors.lastname: Nakamura
authors.forename: Kazukuni
authors.initials: K
authors.lastname: Tahara
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Matsuo
authors.forename: Masaya
authors.initials: M
authors.lastname: Sawamura