Diastereoselective photochromism of bisbenzothienylethenes with an oxycarbonyl-related functional group on the side chain |
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| Authors: | Kose Mahmut Shinoura Miyuki Yokoyama Yayoi Yokoyama Yasushi |
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| Institution: | Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, Hodogaya, Yokohama, 240-8501, Japan. |
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| 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. |
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