title: Enantiopure anthrylene-ethynylene cyclic tetramer and racemization via rotation of anthracene unit about acetylenic axes.
abstract: Four anthracene and four acetylene units are used to construct a chiral pi-conjugate macrocycle, the chirality of which is due to the restricted rotation about acetylenic axes. Enantiomers were readily resolved by chiral HPLC and racemized slowly even at 70 degrees C.
authors.affiliation: Department of Chemistry, Faculty of Science and Institute of Natural Sciences, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan.
authors.forename: Takeharu
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Shimasaki
authors.forename: Haruo
authors.initials: H
authors.lastname: Akashi
authors.forename: Shinji
authors.initials: S
authors.lastname: Toyota