Abstract
2,Methylthiophene (1) was treated at 0℃ with liquid bromine to form 3,5,dibromo,2,methylthiophene (2) which reacted with tributyl borate to give 2,methyl,3,bromo,5,boronate thiophene (3) at,78℃. Treatment of 3 with 3,4,difluorobrombenzene gave 2,methyl,3,bromo,5,(3,4,difluorophenyl)thiophene (4). Finally,a novel photochromic dithienylethene compound,1,2,bis [2,methyl,5(3,4,difluorophenyl),3,thienyl]perfluorocyclopentene (DT,1),was synthesized by the reaction of 4 with perfluorocyclopentene at,78℃. The compound (DT,1)was characterized by IR,NMR,MS,elemental analysis and its photochromic behavior was also discussed.
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