Revisiting indeno[1,2-<i>b</i>]fluorene by steric promoted synthesis while isolating the second stable 4nπ indeno[2,1-<i>a</i>]fluorene
作者:Himanshu Sharma、Nikhil Bhardwaj、Soumyajit Das
DOI:10.1039/d2ob01632j
日期:——
Described herein are the steric promoted synthesis and characterization of symmetric, unsymmetric, and benzo-extended indeno[1,2-b]fluorenes 1–5, including the isolation of stable 4nπ indeno[2,1-a]fluorene 6. Single-crystal XRD analyses of 5 and 6 gave the unambiguous confirmation of unsymmetrical [1,2-b]IF and [2,1-a]IF motifs, respectively. The different ground state antiaromaticity of 5 and 6 was
本文描述了对称、不对称和苯并延伸的茚并[1,2- b ]芴1-5的空间促进合成和表征,包括稳定的4nπ茚并[2,1- a ]芴6的分离。5和6的单晶 XRD 分析分别明确证实了不对称的 [1,2- b ]IF 和 [2,1- a ]IF 基序。Gimarc 的拓扑电荷不稳定方法解释了5和6的不同基态反芳香性。非对称 IF 2-5的电子特性大多介于两者之间1及其其他已知的对称对应物。