Fluorenes and methylene-bridged polyarenes were easily and efficiently synthesized from haloarenes (or aryl triflates) and diarylethynes by a one-pot, two-step procedure. This protocol involves the palladium-catalyzed cycloisomerization and a subsequent base-mediated retro-aldol condensation. A major advantage is that the starting materials need not have ortho functional groups to complete the annulation
芴和亚甲基桥接的聚
芳烃可以通过一锅,两步程序从卤代
芳烃(或芳基
三氟甲磺酸酯)和二芳基
乙炔轻松高效地合成。该方案涉及
钯催化的环异构化和随后的碱介导的逆醛醇缩合。一个主要的优点是,起始材料不需要具有邻位官能团即可完成环化反应。使用二卤代
芳烃,高度π-共轭卤代
芳烃或二芳基
炔烃扩大了设计产品的骨架。苯并[ a]的形成机理对]
芴进行了研究。通过X射线晶体学证实了亚甲基桥联的
茚并
环戊烯的碗状结构。研究了由此制备的产物的光物理和电
化学性质。