Effect of substituents on the 13C NMR chemical shifts of para-substituted α-phenyl-β-pyridylacrylic acids
作者:B.Ž. Jovanović、M. Mišić-Vuković、S.Ž. Drmanić、J.J. Čanadi
DOI:10.1016/s0022-2860(96)09563-4
日期:1997.6
α-phenylcinnamic and 3- and 4-pyridylacrylic acids, with a wide range of substituents effects, were determined in deuterated dimethylsulfoxide (DMSO- d 6 ). The effect of substituents in both the α-phenyl and β-pyridine groups in these acids is investigated using linear free energy relationships and multiple regression analysis as applied to 13 C NMR chemical shifts of the C α and C β of the ethylenic bond
摘要 在氘代二甲基亚砜 (DMSO-d 6 ) 中测定了具有广泛取代基效应的对位取代 α-苯基肉桂酸和 3- 和 4- 吡啶基丙烯酸的 13 C NMR 谱。使用线性自由能关系和多元回归分析研究了这些酸中 α-苯基和 β-吡啶基团中的取代基的影响,这些分析适用于烯键的 C α 和 C β 的 13 C NMR 化学位移以及羧基碳。使用双取代基参数 (DSP) 方法将 α-苯基取代基效应分解为电感和共振组件,指出 π 电子系统中电感和共振效应的混合。