Efficient Synthesis, Structure, and Redox Reactions of 1,4,6,9-Tetraisopropylchalcogenanthrenes
作者:Tatsuya Yamamoto、Satoshi Ogawa、Mutsumi Sugawara、Yasushi Kawai、Ryu Sato
DOI:10.1246/bcsj.79.460
日期:2006.3
1,4,7,10-Tetraisopropyldibenzo[c,g][1,2,5,6]tetrachalcogenocins that were readily synthesized from 4,7-diisopropyl-2,2-dimethyl-1,3,2-benzodichalcogenastannoles underwent selective ring contraction under irradiation with a high-pressure mercury lamp to give the corresponding 1,4,6,9-tetraisopropylchalcogenanthrenes having bulky substituents on the benzene ring at adjacent positions of the 6-membered dichalcogenin unit in moderate yields. X-ray crystal structure determination of 1,4,6,9-tetraisopropylthianthrene revealed that the substituents of bulky substituents such as isopropyl groups scarcely affected the structure of the parent dithiin framework. Measurements of the cyclic voltammetry of thianthrene showed a well-defined reversible redox property, whereas the voltammograms of selenium-containing analogues showed irreversible oxidation waves. In contrast to electrical observations, facile reversible one-electron redox reaction systems were observed between the chalcogenanthrenes and the corresponding chalcogenanthrenium radical cations by chemical oxidation or reduction reactions.
由 4,7-二异丙基-2,2-二甲基-1,3,2-苯并二羰基天冬烯醇容易合成的 1,4,7,10-四异丙基二苯并[c,g][1,2,5,6]四羰基天冬烯,在高压汞灯的照射下发生选择性环收缩,得到相应的 1,4,6,9-四异丙基二羰基天冬烯、4,6,9-四异丙基羰基蒽在 6 元二羰基蒽单元相邻位置的苯环上具有笨重的取代基,产量适中。1,4,6,9-四异丙基噻蒽的 X 射线晶体结构测定显示,异丙基等笨重取代基几乎不影响母体二噻嗪框架的结构。噻蒽的循环伏安测量显示出明确的可逆氧化还原特性,而含硒类似物的伏安图则显示出不可逆的氧化波。与电学观察结果相反,通过化学氧化或还原反应,在瑀蒽和相应的瑀蒽自由基阳离子之间观察到了简便的可逆单电子氧化还原反应系统。