Nonplanar Aromatic Compounds. 8.<sup>1</sup> Synthesis, Crystal Structures, and Aromaticity Investigations of the 1,<i>n</i>-Dioxa[<i>n</i>](2,7)pyrenophanes. How Does Bending Affect the Cyclic π-Electron Delocalization of the Pyrene System?
作者:Graham J. Bodwell、John N. Bridson、Michal K. Cyrañski、Jason W. J. Kennedy、Tadeusz M. Krygowski、Michael R. Mannion、David O. Miller
DOI:10.1021/jo0206059
日期:2003.3.1
distortion from planarity of the pyrene system influences its pi-electron delocalization was investigated by using two quantitative descriptors of aromaticity based on geometry (HOMA) and magnetism (magnetic susceptibility and NICS). Both methods suggest that the aromaticity of the pyrene moiety is diminished only slightly upon increasing the bend angle theta from 0 degrees to 109.2 degrees.
通过从5羟基间苯二甲酸开始的9-10个步骤,合成了一系列具有越来越不平面的pyr部分的1,n-二氧杂并[n](2,7)邻苯二酚(n = 7-12)。通过晶体学确定该系列的每个成员的晶体结构。发现几种光谱性质随pyr单元的非平面性程度而变化。通过使用基于几何(HOMA)和磁性(磁化率和NICS)的两个芳香性定量指标,研究了from体系平面度的畸变影响其π电子离域的方式。两种方法都表明,当弯曲角θ从0度增加到109.2度时,the部分的芳香性仅稍微降低。