Diastereoselective photochromism of bisbenzothienylethenes with an oxycarbonyl-related functional group on the side chain
Y Yokoyama, Mahmut Kose, M Shinoura, Y Yokoyama
article (Uluslararası, Hakemli) | Yazar(lar): Y Yokoyama, Mahmut Kose, M Shinoura, Y Yokoyama | Yıl: 2004 | Dergi/Kurum: JOURNAL OF ORGANIC CHEMISTRY | İndeks: WOS.SCI, WOS.IC | DOI: 10.1021/jo048771z — Özet: Nine 1-[2-(l-substituted)ethyl-3-benzothienyl]-2-(2-methyl-3-benzothienyl)hexafluorocyclopentenes (4-substitute
Nine 1-[2-(l-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-nitro-phenoxycarbonyloxy-substituted compound recorded a remarkable 94% diastereomer excess with 91% conversion to the closed form.