13C NMR substituent-induced chemical shifts in 4-(substituted phenyl)-3-phenyl-1,2,4-oxadiazol-5(4H)-ones (thiones)
作者:Yesim Saniye Kara
DOI:10.1016/j.saa.2015.04.081
日期:2015.10
4-(substituted phenyl)-3-phenyl-1,2,4-oxadiazol-5(4H)-ones and ten 4-(substituted phenyl)-3-phenyl-1,2,4-oxadiazol-5(4H)-thiones were synthesized. These oxadiazole derivatives were characterized by IR, (1)H NMR, (13)C NMR and elemental analyses. Their (13)C NMR spectra were measured in Deuterochloroform (CDCl3). The correlation analysis for the substituent-induced chemical shift (SCS) with Hammett substituent
目前,主要研究新颖的十个4-(取代的苯基)-3-苯基-1,2,4-恶二唑-5(4H)-和十个4-(取代的苯基)-3-苯基-1,2,合成了4-恶二唑-5(4H)-硫酮。这些恶二唑衍生物通过IR,(1)H NMR,(13)C NMR和元素分析来表征。在氘代氯仿(CDCl3)中测量了它们的(13)C NMR光谱。取代基引起的化学位移(SCS)与哈米特取代基常数(σ),冈本布朗取代基常数(σ(+),σ(-)),感应取代基常数(σI)和不同的共振取代基常数之间的相关性分析(使用SSP(单取代基参数),DSP(双取代基参数)和DSP-NLR(双取代基参数-非线性共振)方法以及单次和多次回归分析执行σR,σR(o)。发现所有相关性均为负ρ值(反向取代基效应)。所有统计分析的结果,恶二唑环的CN,CO和CS碳的(13)C NMR化学位移均显示出令人满意的相关性。