Stereogenic motif consisting of rigid ring and intraannular chains: isolation and structures of stereoisomers of 9-alkyl-1,8-anthrylene-butadiynylene cyclic dimers.
Stereoisomers of the title pi-conjugated compounds with intraannular propyl and butyl groups were isolated by chromatography. The high barrier to isomerization is attributed to the steric hindrance between the alkyl chains and the rigid framework.
Toyota
Shinji
S
Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan. stoyo@chem.ous.ac.jp
Onishi
Hiroyuki
H
Kawai
Yoshihiro
Y
Morimoto
Takaaki
T
Miyahara
Hiroaki
H
Iwanaga
Tetsuo
T
Wakamatsu
Kan
K