Solvent and substituent effects on the reaction of 2- and 4-chloro-3,5-dinitrobenzotrifluorides with substituted anilines
作者:Basim H. M. Asghar、Magda F. Fathalla、Ezzat A. Hamed
DOI:10.1002/kin.20455
日期:2009.12
The solvent effect on a nucleophilic substitution reaction of 2‐ and 4‐chloro‐3,5‐dinitrobenzotrifluoride with substituted anilines was studied in methanol, acetonitrile, and toluene at 25°C. This reaction is of second order, except 2‐chloro‐3,5‐dinitrobenzotrifluoride in toluene shows third order. The kA values are found to be dependent on the substituent in aniline and give good Hammett correlations
在25°C的甲醇,乙腈和甲苯中研究了溶剂对2-和4-氯-3,5-二硝基苯并三氟与取代苯胺的亲核取代反应的影响。该反应是二级反应,只是甲苯中的2-氯-3,5-二硝基苯并三氟甲烷显示三级反应。该ķ一发现该值取决于苯胺中的取代基并具有良好的哈米特相关性。对于苯胺与2-氯-3,5-二硝基苯并三氟在甲醇和乙腈中的反应,获得的ρ值为−4.07和−4.62。在甲醇,乙腈和甲苯中,苯胺与4-氯-3,5-二硝基苯并三氟醚反应的ρ值分别为−3.38,−4.11和−4.34。前一种化合物与苯胺在甲苯中的反应在苯胺中显示出第二级。反应对外部碱如DABCO的依赖性表明质子转移控制步骤。©2009 Wiley Periodicals,Inc.国际化学杂志Kinet 41:777–786,2009