Chinese Journal of Organic Chemistry >
Effect of Substituents on Reduction Potential of Para-disubstituted N-Benzylidenebenzenamine Derivatives
Received date: 2014-11-25
Revised date: 2014-12-16
Online published: 2015-02-02
Supported by
Project supported by the National Natural Science Foundation of China (No. 21272063), the Scientific Research Fund of Hunan Provincial Education Department (No. 14C0466), and the Natural Science Foundation of Hunan Province (No. 14JJ3112).
52 samples of 4,4'-disubstituted N-benzylidenebenzenamine (p-XPhCH=NC6H4Y-p) derivatives were synthesized, the effect of substituents on the reduction potential ERed of these compounds was systematically investigated. The result shows that there is not linear relation between their ERed and the chemical shift δC(C=N) of the 13C NMR of C=N bridge bond in the molecules. The factors affecting ERed are obvious different from that affecting on δC(C=N), and the change regularity of ERed can not be expressed well by only employing Hammett substituent constant. The main factors affecting the ERed are the field/inductive effect of substituent X, the conjugative effects of substituents X and Y, and the excited-state substituent constant of substituent X plays an important role of influence on ERed. Above four parameters have good correlations with the ERed of the 52 samples of compounds, the correlation coefficient of the correlation equation is 0.9756, and the standard derivation is 0.052 V. Among the four factors, the contributions of the field/inductive effect, the conjugative effect and the excited-state substituent constant of group X to the changes of ERed are relative large, while the contribution of the conjugative effect of group Y is relative small, and can not be ignored.
Cao Chenzhong , Bi Yakun , Cao Chaotun . Effect of Substituents on Reduction Potential of Para-disubstituted N-Benzylidenebenzenamine Derivatives[J]. Chinese Journal of Organic Chemistry, 2015 , 35(6) : 1302 -1309 . DOI: 10.6023/cjoc201411037
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