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The photoreaction of tetrakis(2-methylthien-3-yl)ethene (1a) and its tetrakis(methylthio) derivative 1b was investigated in the context of a potentially new chromic system responsive to both photoexcitation and electron transfer. UV irradiation of 1 at low conversion leads to production of its cyclic isomer 2 while 2 returns to 1 upon vis irradiation, representative of facile photochromic behavior...
As part of an effort to develop a new chromic system that responds to both photoexcitation and electron transfer, tetrakis(2-methylthien-3-yl)ethene (3a) and its tetrakismethylthio derivative (3b) were synthesized. The results of X-ray crystallographic and theoretical analyses of these substances suggest that (1) conformers of 3 with an antiparallel arrangement of two vicinal thienyl groups will undergo...
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