Conformational Analysis of (±)-(1,1′-Biindene)-3,3′-dione, 2,2′,3,3′-Tetrahydro-(1,1′-binaphthalene)-4,4′(1<i>H</i>,1′<i>H</i>)-dione, and (1,1′-Bibenzosuberene)-5,5′-dione
作者:Yulin Lam、Ngai Ling Ma、Hsing-Hua Huang、Eping Liang
DOI:10.1246/bcsj.76.1897
日期:2003.10
The dipole moments of (±)-(1,1′-biindene)-3,3′-dione 1, (±)-2,2′,3,3′-tetrahydro-(1,1′-binaphthalene)-4,4′(1H,1′H)-dione 2, and (±)-(1,1′-bibenzosuberene)-5,5′-dione 3 in carbon tetrachloride and benzene were measured over a range of temperatures. Analyses of the relative permittivity data in carbon tetrachloride and benzene showed that at 25 °C, 1 exists predominantly in the gauche conformation, whilst
(±)-(1,1'-二茚)-3,3'-二酮 1, (±)-2,2',3,3'-四氢-(1,1'-联萘)-的偶极矩在一定温度范围内测量了四氯化碳和苯中的 4,4'(1H,1'H)-二酮 2 和 (±)-(1,1'-二苯并丁二烯)-5,5'-二酮 3。四氯化碳和苯的相对介电常数数据分析表明,在 25 °C 时,1 主要存在于 gauche 构象中,而 2 和 3 则有利于反式。将 gauche 和反式旋转异构体之间的能量差异以及 gauche/反式种群商的实验得出的值与分子轨道计算预测的值进行比较。2和3的晶体和分子结构是通过单晶X射线衍射方法确定的。两种化合物都以反式构象在固态中存在。