Conformational behaviour of medium-sized rings. Part 6. 5,6,11,12,17,18-Hexahydrotribenzo[a,e,i]cyclododecene and its 2,3,8,9,14,15- and 1,4,7,10,13,16-hexamethyl derivatives. 2,3,8,9- and 1,4,7,10-Tetramethyl-5,6,11,12-tetrahydrodibenzo[a,e]cyclo-octene
作者:David J. Brickwood、W. David Ollis、Julia Stephanidou Stephanatou、J. Fraser Stoddart
DOI:10.1039/p19780001398
日期:——
The temperature dependences of (i) the broad-band decoupled 13C n.m.r. spectrum of 5,6,11,12,17,18-hexahydrotribenzo[a,e,i]cyclododecene (1) and (ii) the 1H n.m.r. spectra of its 2,3,8,9,14,15-(2) and 1,4,7,10,13,16-(3) hexamethyl derivatives have been interpreted in terms of ring inversion between enantiomeric C2 conformations. Conformational analysis on these molecules has been carried out with the
(i)5,6,11,12,17,18-六氢三苯并[ a,e,i ]环十二碳烯(1)和(ii)1 H nmr光谱的宽带解耦13 C nmr光谱的温度依赖性其2,3,8,9,14,15-(2)和1,4,7,10,13,16-(3)的六甲基衍生物已根据对映体C 2构象之间的环倒置来解释。这些分子的构象分析已经借助于应变能的计算,对母体烃(1)及其1,4,7,10,13,16-六甲基衍生物(3)的选定构象进行了分析。发现计算和实验的热力学参数之间的有用的相关性。温度的依赖性5,6,11,12-四氢二苯并[ a, e ]环辛烯的2,3,8,9-(15)和1,4,7,10-(16)四甲基衍生物的1 H nmr光谱( 14)已根据椅子和船形构象的相互转换进行了解释。对1,4,7,10-四甲基衍生物(14)选定构象的应变能计算已导致计算出的热力学参数与实验热力学参数之间具有有用的相关性。