Novel synthesis, static and dynamic properties, and structural characteristics of 5-cyano[n](2,4)pyridinophane-6-ones (n = 9–6) and their chemical transformations
作者:Makoto Nitta、Tsuyoshi Sakakida、Hideo Miyabara、Hiroyuki Yamamoto、Shin-ichi Naya
DOI:10.1039/b416013d
日期:——
chains for [7](2,4)- and [6](2,4)pyridinophane-6-one derivatives 12c and 12d. The energy barrier (Delta G(++)) of the bridge flipping of 12c is estimated to be 12.0 kcal mol(-1)(T(c)= 0 degree C). On the other hand, compound 12d undergoes pseudorotation (conformational change of the methylene chain) at room temperature, and does not undergo bridge flipping even at 150 degree C in DMSO-d(6). The energy
5-氰基[n](2,4)吡啶啉-6-酮12a-d(n = 9、8、7和6)的新颖合成包括使氰基乙酰胺与环烷-2-烯酮反应。根据其光谱性质,循环伏安法和理论计算,研究了它们的静态和动态特性以及结构特性。在不同温度下的(1)H和(13)C NMR光谱已阐明[7](2,4)-和[6](2,4)吡啶并-6-6衍生物12c的亚甲基链的动力学行为。和12d。12c的桥翻转的能垒(Delta G(++))估计为12.0 kcal mol(-1)(T(c)= 0摄氏度)。另一方面,化合物12d在室温下进行假旋转(亚甲基链的构象变化),并且即使在DMSO-d(6)中在150℃下也不发生桥翻转。发现亚甲基链12d的假旋转的能垒(Delta G(++))为10.5 kcal mol(-1)(T(c)=-25摄氏度),因此有两个稳定构象的如理论计算所预测的那样确定12d的六亚甲基桥。还通过X射线晶体学分析确定12