Comparison of the <sup>13</sup>
C (C = N) chemical shifts of substituted <i>N</i>
-(phenyl-ethylene)-anilines and substituted <i>N</i>
-(benzylidene)-anilines
作者:Zhongzhong Cao、Chaotun Cao、Chenzhong Cao
DOI:10.1002/poc.3450
日期:2015.8
Comparison of 13C NMR of C = N bond chemical shifts δC(C = N) in substituted N‐(phenyl‐ethylene)‐anilines XArC(Me) = NArY (XPEAYs) with that in substituted N‐(benzylidene)‐anilines XArCH = NArY (XBAYs) was carried out. The δC(C = N) of 61 samples of XPEAYs were measured, and the substituent effect on their δC(C = N) were investigated. The results show the factors affecting the δC(C = N) of XPEAYs are
比较13 C = N键的化学位移的C NMR δ Ç在取代的(C = N)ñ - (苯基-亚乙基)-anilines XARC(ME)=进制在取代的(XPEAYs)与ñ - (亚苄基)-anilines进行XArCH = NArY(XBAYs)。所述δ Ç测定XPEAYs 61个样品的(C = N),并在其上的取代基影响δ Ç(C = N)进行了调查。结果表明,影响的因素δ ÇXPEAY的(C = N)与XBAY的(C = N)完全不同。得到了61种化合物的五参数相关方程,其相关系数为0.9922,标准误为0.12 ppm。结果表明,在XPEAYs,取代基X和Y的电感效应是影响的主要因素δ Ç(C = N),而它们的共轭效应对的影响非常小δ Ç(C = N),并且可被忽略。X和Y之间和C = N键和取代基Y的我之间的特定的取代基的交相互作用效应影响的重要因素δ Ç(C = N)。此外,替代Y的激发态的取代参数具有向一定的贡献δ