取代基效应对N-(2-羟基苯亚乙基)苯胺碳核磁共振化学位移的影响  被引量:3

Substituent Effect on the 13C NMR Chemical Shifts of N-(2-hydroxyl-phenyl-ethylene)-anilines

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作  者:刘军兰 曹朝暾[1] Liu Junlan;Cao Chaotun(Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Key Laboratory of QSAR/QSPR of Hunan Provincial University, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

机构地区:[1]湖南科技大学化学化工学院理论有机化学与功能分子教育部重点实验室分子构效关系湖南省普通高等学校重点实验室

出  处:《湖南科技大学学报(自然科学版)》2018年第2期72-76,共5页Journal of Hunan University of Science And Technology:Natural Science Edition

基  金:国家自然科学基金资助项目(21672058)

摘  要:合成了一系列N-(2-羟基苯亚乙基)苯胺2-OH-XAr(Me)=NAr Y化合物,以核磁共振1H氢谱和-(13)C碳谱确定其结构,指认出桥基C(Me)=N上碳的化学位移δC2-OH,C(Me)=N],定量研究取代基效应对δC2-OH,C(Me)=N]的影响.得到一个4参数定量方程,相关系数R为0.940 1,较好地表达了δC2-OH,C(Me)=N]的变化规律.结果表明:该类化合物化学位移δC2-OH,C(Me)=N]由取代基基态极性参数σ(X)与σ(Y),激发态取代基参数(Y),基团X和Y之间的特殊交叉作用-2等共同表达.通过δC2-OH,C(Me)=N]与二取代-氮(苯亚乙基)苯胺衍生物XAr C(Me)=NAr Y桥基C(Me)=N上碳化学位移δCC(Me)=N]的比较发现:化合物2-OH-XAr(Me)=NAr Y受分子内氢键的影响,这2类化合物桥基上碳的化学位移之间没有良好的线性关系.因而,在应用NMR谱图解析有机化合物分子结构时,不能简单地用δCC(Me)=N]的变化去类比δC2-OH,C(Me)=N]的变化.A series of N- ( 2 - hydroxyl - phenyl - ethylene ) - anilines 2 - OH - XArC ( Me ) = NArY were synthesized, and their ^1H NMR and ^13 C NMR spectra were measured. The 13 C chemical shift values of C (Me) = N bridge groups, δc [ 2-OH, C (Me) = N ] were determined. The effect of substituents X and Y on the δc [ 2-OH, C (Me)= N ] were investigated quantitatively. A four-parameter correlation equation with correlation coefficient 0.940 1 was obtained for quantifying the δc [ 2-OH, C (Me) = N]. The result indicates that the δc [ 2-OH, C (Me) = N ] of N-(2-hydroxyl-phenyl-ethylene)-anilines is dominated by polar substituent constant of X [ σ (X) ] and Y [ σ (Y) ], excited - state substituent constant of Y [ σcc^ex ( Y ) ] and substituent specific cross - interaction effect between X and Y [ σcc^ex2 ]. Also the δc [ 2-OH, C (Me) = N ] of N- ( 2-hydroxyl-phenyl- ethylene ) -anilines is compared with the -c [ C (Me) = N ] of C (Me) = N bridge group in N- (phenyl-ethylene) - anilines XArC(Me) = NArY. It shows there is no good linear relationship between the δc [ 2-OH, C (Me) = N ] and δc [ C (Me)= N ] due to the intramolecular hydrogen bond in 2-OH-HAt(Me) = NArY. Therefore one cannot only use the change of δc [ C (Me) = N ] cannot be used the change of δc [ C (Me) = N ] to deduce, in confirming the organic molecule structures with NMR spectra.

关 键 词:核磁共振(NMR) ^13C NMR化学位移 取代基效应 N-(2-羟基苯亚乙基)苯胺 分子内氢键 

分 类 号:O621.1[理学—有机化学]

 

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