Rearrangement of a 2-Methylenecyclobutanone Derivative Triggered by Photoinduced Electron Transfer: An Unprecedented Oxa Analogue of the Tetramethyleneethane Radical Cation
作者:Hiroshi Ikeda、Futoshi Tanaka、Kimio Akiyama、Shozo Tero-Kubota、Tsutomu Miyashi
DOI:10.1021/ja038068c
日期:2004.1.1
3-dimethyl-4-methylenecyclobutanone (1) gives 2,2-bis(p-methoxyphenyl)-4-isopropylidenecyclobutanone (2), whereas 2 affords a CA adduct (4), suggesting that a novel rearrangement of 1 to give 2 occurs irreversibly via intermediate 3*+, a radical cation variant of an unprecedented oxa analogue of tetramethyleneethane.
在对氯苯醌 (CA) 照射下,2,2-双(对甲氧基苯基)-3,3-二甲基-4-亚甲基环丁酮 (1) 生成 2,2-双(对甲氧基苯基)-4-异亚丙基环丁酮 (2 ),而 2 提供了 CA 加合物 (4),表明 1 的新重排得到 2 是通过中间体 3*+ 不可逆地发生的,中间体 3*+ 是前所未有的四亚甲基甲烷氧杂类似物的自由基阳离子变体。