作者:Jun Lu、Douglas M. Ho、Nancy J. Vogelaar、Christina M. Kraml、Stefan Bernhard、Neal Byrne、Laura R. Kim、Robert A. Pascal
DOI:10.1021/ja065935f
日期:2006.12.1
reaction of 1,3-diphenylphenanthro[9,10-c]furan with bisaryne equivalents generated from 1,2,4,5-tetrabromo-3,6-diarylbenzenes in the presence of n-butyllithium, followed by deoxygenation of the double adducts with low-valent titanium. Both are bright red solids with a strong orange fluorescence in solution. The X-ray structures of these compounds show them to be the most highly twisted polycyclic aromatic
9,10,11,20,21,22-六苯基四苯并[a,c,l,n]并五苯(2)和二甲基衍生物(2m)由1,3-二苯基菲[9,10-c]反应制备]呋喃与双芳烃等价物在正丁基锂存在下由 1,2,4,5-四溴-3,6-二芳基苯生成,然后用低价钛对双加合物进行脱氧。两者都是亮红色固体,在溶液中具有强烈的橙色荧光。这些化合物的 X 射线结构表明它们是已知的扭曲度最高的多环芳烃。化合物2具有144度的端到端扭曲,2m的两个晶体学独立的分子具有138度和143度的扭曲。两种分子都通过手性载体上的色谱分离,纯对映异构体具有极高的比旋光度(对于 2,αD = 7400 度;2m,5600 度),但分子在室温下缓慢外消旋(DeltaG++rac = 24 kcal/mol)。实验几何形状和观察到的 2 的外消旋化势垒都与分子在各种水平上的计算研究非常一致。尝试通过四苯基苄与 9,10,12,13-四苯基-11-氧杂环戊二烯