Chemistry of anthracene–acetylene oligomers. XVII. Synthesis, structure, and dynamic behavior of 1,8-anthrylene pentamers and hexamers with acetylene linkers
作者:Shinji Toyota、Takahiro Kawakami、Risa Shinnishi、Rie Sugiki、Shinya Suzuki、Tetsuo Iwanaga
DOI:10.1039/c0ob00290a
日期:——
rigid structure with strained alkyne carbons. Meanwhile, out of several possible conformers the hexamers preferred to take parallelogram-prism structures due to transannular π⋯π interactions, and conformational interconversions via rotation about the acetylene axes took place rapidly at room temperature. NMR spectra and electronic spectra are discussed on the basis of molecular structures. The enantiomers
三种类型的由5或6个组成的环状低聚物 1,8-蒽通过偶联反应将相应的无环前体进行大环合成来合成具有乙炔接头的单元。M05 /上的DFT计算3-21G能级表明五聚体具有相对刚性的结构,并带有应变炔烃碳。同时,在几种可能的构象异构体中,由于跨环的π⋯π相互作用,六聚体优选采用平行四边形-棱镜结构,并且在室温下经由绕乙炔轴旋转的构象相互转化迅速发生。基于分子结构讨论了NMR光谱和电子光谱。手性对映体六聚体 通过手性HPLC拆分具有1个二乙炔连接基的化合物,并显示出光学活性。