作者:Leonardus W. Jenneskens、Henricus J. R. De Boer、Willem H. De Wolf、Friedrich Bickelhaupt
DOI:10.1021/ja00180a045
日期:1990.11
metacyclophanes revealed a rather unusual reactivity pattern. Compared to normal, planar aromatic analogues, the cyclophanes showed two remarkable trends: (1) for typical aromatic reactions (acid-catalyzed or photochemical rearrangement, reductions, Diels-Alder reactions), a strong rate enhancement was observed; (2) toward organolithium reagents, abnormal reaction pathways are followed, such as nucleophilic substitution
对取代 [5] 环芳烃的化学行为的研究揭示了一种相当不寻常的反应模式。与普通的平面芳香类似物相比,环芳烃显示出两个显着的趋势:(1)对于典型的芳香反应(酸催化或光化学重排、还原、Diels-Alder 反应),观察到强烈的速率增强;(2)对于有机锂试剂,遵循异常反应途径,如亲核取代、SET等自由基过程。鉴于有压倒性的证据支持芳烃离域基本上未减少,这种不寻常的行为必须归因于这些小环芳烃的特殊几何形状,尤其是所有这些反应的初始步骤中发生的应变急剧减少