Barriers to internal rotation around the C–N bond in 3-(o-aryl)-5-methyl-rhodanines using NMR spectroscopy and computational studies. Electron density topological analysis of the transition states
作者:Yeliz Aydeniz、Funda Oğuz、Arzu Yaman、Aylin Sungur Konuklar、Ilknur Doğan、Viktorya Aviyente、Roger A. Klein
DOI:10.1039/b406556e
日期:——
We have investigated the pairs of rotational isomers for six 3-(o-aryl)-5-methyl-rhodanines (Z = H, F, Cl, Br, OH, and CH3) using NMR spectroscopy and density functional theory (DFT) calculations. Electron density topological and NBO analysis has demonstrated the importance of non-covalent interactions, characterised by (3, -1) bond critical points (BCPs), between the oxygen and sulfur atoms on the
我们已经使用NMR光谱和密度泛函理论(DFT)计算研究了六种3-(o-芳基)-5-甲基-罗丹宁(Z = H,F,Cl,Br,OH和CH3)的旋转异构体对。电子密度拓扑和NBO分析表明,以稳定噻唑烷环上的氧和硫原子与芳基取代基之间的非共价键相互作用为特征(3,-1)键临界点(BCP),以稳定过渡态。还使用计算结果确定了旋转的能量激活障碍。根据非对映异构体对的NMR分离实验确定了3-(邻氯苯基)-5-甲基-罗丹宁(3S)和3-(邻甲苯基)-5-甲基-罗丹宁(6S)的旋转势垒,