Abstract
1-(2,5-Dimethylthien-3-yl)-2-(4-acetyl-2,5-dimethylthien-3-yl) cyclopentene has been synthesized by a six-step procedure, such as Vilsmeier reaction, Wolff-Kishner-Huang reduction reaction, The Friedel-Crafts acylation, McMurry reaction etc. Upon alternate irradiation with 297 and 500 nm light upon 1-(2,5-Dimethylthien-3-yl)-2-(4-acetyl-2,5-dimethylthien-3-yl) cyclopentene, the absorption spectrum changes reversibly and a clear isosbestic point appears. These results suggest that the compound can undergo photochromism and do not decompose during the irradiation.
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