title: Synthesis and properties of butterfly-shaped expanded naphthofuran derivatives.
abstract: The construction of dinaphtho[2,1-b;2',3'-d]furan-6-ol was developed via a dehydration reaction involving two molecules of 2,3-dihydroxynaphthalene in the presence of a strong acid. Starting from the dinaphthofuran, a variety of butterfly shaped derivatives were synthesized. The optical properties of these compounds were investigated with special attention to the dihedral angle formed by adjacent dinaphthofuran rings and/or the sizes of the fused aromatic rings.
authors.affiliation: Graduate School of Life and Environmental Sciences, Kyoto Prefectural University , Shimogamo, Sakyo-ku Kyoto 606-8522, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Nakanishi
authors.forename: Takahiro
authors.initials: T
authors.lastname: Sasamori
authors.forename: Kouji
authors.initials: K
authors.lastname: Kuramochi
authors.forename: Norihiro
authors.initials: N
authors.lastname: Tokitoh
authors.forename: Takeo
authors.initials: T
authors.lastname: Kawabata
authors.forename: Kazunori
authors.initials: K
authors.lastname: Tsubaki