Study of Dithienylcyclopentene with Substituents at 4-Position of Thiophene

Sheng Min Zhao; Wei Lin Zhang; Han Hui Huang; Wen Guan Zhang

doi:10.4028/www.scientific.net/AMR.1033-1034.1105

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Study of Dithienylcyclopentene with Substituents at 4-Position of Thiophene

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.