The reaction of substituted anilines and benzenesulfonyl chlorides has been used to prepare 49 substituted N-phenylbenzenesulfonamides of general formula 4-X-C6H4SO2NHC6H4-Y-4'. Their purity was checked by elemental analysis. The substituents X and Y include H, CH3, CH3O, Cl, Br, CN, and NO2. The dissociation constants of all compounds were determined by potentiometric titration in methanol, acetonitrile, N,N-dimethylformamide, and pyridine. The obtained dissociation constants, pKHA, were correlated with various sets of substituent constants. It was found that the effects of substituents X and Y on the dissociation are best described by using the Hammett equation with σp constants and the Yukawa-Tsuno equation with σp- and σp constants, respectively. This result confirms the direct conjugation of Y substituent with the reaction centre. The explained variability using the additive model was above 96% in all the solvents used. The data also provided information about the transmission effect of the SO2 group. The average dissociation constants were further processed by the latent variables methods, principal components and conjugated deviations analyses.
替代
苯胺和
苯磺酰氯的反应已被用于制备49种通式为4-X-C
6H
4SO
2NHC
6H
4-Y-4'的取代N-苯基苯磺酰胺。它们的纯度通过元素分析进行了检查。取代基X和Y包括H、CH
3、CH
3O、Cl、Br、CN和NO
2。所有化合物的解离常数通过在
甲醇、
乙腈、
N,N-二甲基甲酰胺和
吡啶中的电位滴定确定。获得的解离常数pKHA与各种取代基常数相关联。发现取代基X和Y对解离的影响最好通过使用带有σp常数的Hammett方程和带有σp-和σp常数的Yukawa-Tsuno方程来描述。这一结果证实了Y取代基与反应中心的直接共轭。在所有使用的溶剂中,使用加性模型解释的可变性超过96%。数据还提供了关于SO
2基团的传输效应的信息。平均解离常数进一步通过潜在变量方法、主成分和共轭偏差分析进行处理。