Crystal Structure and Stereoselective Solid-State Photodimerization of 1-(9-Anthryl)alkyl Acetates
作者:Yukie Mori、Yumiko Horikoshi、Koko Maeda
DOI:10.1246/bcsj.69.1755
日期:1996.6
X-Ray structure analyses of 1-(9-anthryl)alkyl acetates [AnCH(OAc)R; An = 9-anthryl, R = Me (1a), Et (1b), i-Pr (1c), t-Bu (1d), CF3 (1e)] indicated that these molecules adopted similar conformations in which the bond connecting the chiral carbon and the substituent was oriented almost perpendicular to the anthracene plane. In the crystals of 1b—1e two adjacent anthracenes related by an inversion center
乙酸 1-(9-蒽基) 烷基酯 [AnCH(OAc)R; 的 X 射线结构分析;An = 9-anthryl, R = Me (1a), Et (1b), i-Pr (1c), t-Bu (1d), CF3 (1e)] 表明这些分子采用相似的构象,其中连接手性碳和取代基的取向几乎垂直于蒽平面。在 1b-1e 的晶体中,两个相邻的通过反转中心相关的蒽以较短的面间距(3.5-3.6 A)堆叠,这有利于形成中间头尾二聚体。1b、1c 和 1e 晶体的光解以几乎 100% 的产率提供了中间二聚体,而 1d 是光稳定的。1b (0.16) 的二聚化量子产率高于溶液中的量子产率。尽管二聚反应不是以单晶到单晶的方式进行,观察到的高选择性表明,即使单体的晶格被破坏,反应也会发生在 π 堆积对之间。苯溶液中的 1a-1e 辐照得到...