Synthesis and rotational barriers of atropisomers of 1,2-bis[5-(11H-benzo[b]fluorenyl)]benzenes and related compounds
作者:Hua Yang、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1016/j.tet.2005.10.062
日期:2006.2
Several 1,2-bis[5-(11H-benzo[b]fluorenyl)]benzenes and related compounds were synthesized via a cascade reaction sequence of the corresponding benzannulated enyne-allene precursors. The X-ray structures showed that the two benzo[b]fluorenyl moieties attached via the C5 carbons to the adjacent carbon atoms of the central benzene ring are oriented essentially perpendicular to the central benzene ring.
通过相应的苯并环化的烯炔-丙二烯前体的级联反应序列,合成了一些1,2-双[5-(11 H-苯并[ b ]芴基)]苯和相关化合物。X射线结构表明,经由C 5碳连接至中心苯环的相邻碳原子的两个苯并[ b ]芴基部分基本上垂直于中心苯环。围绕碳-碳单键附接苯并[旋转速率b ]芴基结构部分至中央苯环相对较慢,允许几个抗和顺式在环境温度下被分离阻转异构体。