title: Intramolecular reductive double cyclization of o,o'-bis(arylcarbonyl)diphenylacetylenes: synthesis of ladder pi-conjugated skeletons.
abstract: Upon the treatment of bis(arylcarbonyl)diphenylacetylenes with lithium naphthalenide, the carbonyl reduction dominantly occurs over the acetylene reduction. The produced bis(radical anion) intermediate undergoes a synchronous double-radical 5-endo-dig cyclization. This simple reduction procedure produces two intriguing classes of ladder pi-conjugated skeletons, i.e., emissive methylene-bridged stilbenes and dibenzo[a,e]pentalenes regarded as a cyclic 1,4-diphenylbutadiene.
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo, Chikusa, Nagoya 464-8602, Japan.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Zhang
authors.forename: Takashi
authors.initials: T
authors.lastname: Karasawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamada
authors.forename: Atsushi
authors.initials: A
authors.lastname: Wakamiya
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Yamaguchi