Per-Substituted [8]Circulene and Its Non-Planar Fragments: Synthesis, Structural Analysis, and Properties
作者:Chieh-Ning Feng、Wen-Ching Hsu、Jen-Yi Li、Ming-Yu Kuo、Yao-Ting Wu
DOI:10.1002/chem.201600124
日期:2016.6.27
structures were unambiguously verified by X‐ray crystallography. Successive benzannulations significantly affect the molecular geometries, dynamic behaviors, and physical properties of the compounds. In this series of compounds, [8]circulene is the most strained one, as reflected by the significant deplanarization of the phenanthrene moieties (ca. 63° in the bay region) and the fact that it has the highest
报道了全系列苯并二苯并四苯撑的合成,结构和物理性质。钯催化的四碘取代的2,3,6,7,10,11,14,15-八甲基四亚苯基与不足的二(4-茴香基)乙炔的环化反应产生了全取代的[8]平面碎片,包括单,对二,邻二分和三分产品。X射线晶体学清楚地证实了它们的结构。连续的苯环化会显着影响化合物的分子几何形状,动力学行为和物理性质。在这一系列化合物中,[8]环烯是最应变的化合物,这反映在菲部分显着去平面化(海湾区域约为63°)以及其具有最高的应变能(120.6 kcal mol)的事实上。-1)。通过实验和理论研究了这些化合物的动力学行为。证实全取代的[8]环的环翻动是通过假旋转进行的,其势垒约为21 kcal mol -1,而其非平面碎片则需要更多的能量来进行环反转。所研究化合物的光物理和电化学性质在很大程度上取决于有效π共轭的程度。连续的苯环使吸收带和发射带都发生红移,并降低了第一氧化电位。