Amidines. VIII. A kinetic study of alcoholysis of N1-arenesulfonyl-N1,N2-diarylacetamidines.
作者:Machiko ONO、Reiko TODORIKI、Shinzo TAMURA
DOI:10.1248/cpb.39.558
日期:——
Alcoholysis of N1-Arenesulfonyl-N1, N2-diarylacetamidines (1-30) was studied kinetically. The rate of the reaction between the substrates and ethoxide ion depended on the electron-withdrawing resonance effect of the substituents on both the N1-aryl and N2-aryl groups to a similar extent. The rate of the neutral alcoholysis depended on the resonance effect of the N1-aryl substituent to a larger extent than in the former reaction, and depended hardly at all on the electron-releasing resonance effect of the N2-aryl substituent, showing that the reaction does not proceed by the solvolysis mechanism.A reaction mechanism is proposed in which the rate-determining attack of the nucleophile is accompanied by the concerted departure of the N-arylarenesulfonamide group.
对 N1-壬磺酰基-N1,N2-二芳基乙酰胺(1-30)的醇解进行了动力学研究。底物与乙氧离子的反应速率在类似程度上取决于 N1 芳基和 N2 芳基上取代基的吸电子共振效应。与前一种反应相比,中性醇解反应的速率在更大程度上取决于 N1-芳基取代基的共振效应,而几乎不取决于 N2-芳基取代基的电子释放共振效应,这表明该反应不是通过溶解机理进行的。