title: Diastereoselective photochromism of bisbenzothienylethenes with an oxycarbonyl-related functional group on the side chain.
abstract: Nine 1-[2-(1-substituted)ethyl-3-benzothienyl]-2-(2-methyl-3-benzothienyl)hexafluorocyclopentenes (4-substituted benzoyloxy, N-arylcarbamoyloxy, and aryloxycarbonyloxy) were synthesized. They showed diastereoselective photochromic ring closure upon UV irradiation. Among them, 4-nitrophenoxycarbonyloxy-substituted compound recorded a remarkable 94% diastereomer excess with 91% conversion to the closed form.
authors.affiliation: Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, Hodogaya, Yokohama, 240-8501, Japan.
authors.forename: Mahmut
authors.initials: M
authors.lastname: Kose
authors.forename: Miyuki
authors.initials: M
authors.lastname: Shinoura
authors.forename: Yayoi
authors.initials: Y
authors.lastname: Yokoyama
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Yokoyama