Ethyl Cyclohexanone-2-carboxylate in Aqueous Micellar Solutions. 2. Enol Nitrosation in Anionic and Cationic Micelles
作者:Emilia Iglesias
DOI:10.1021/jp0100755
日期:2001.10.1
both the ester hydrolysis and enol nitrosation reactions of ethyl cyclohexanone-2-carboxylate, ECHC, were measured in aqueous acid media. In equal acid concentration, the enol nitrosation reaction rate is more than 10 times faster than the ester hydrolysis reaction rate; this fact makes possible the separate (independent) study of both reactions undergone by ECHC. Anionic micelles of sodium dodecyl
在酸性水溶液中测量了 2-羧酸乙酯 ECHC 的酯水解和烯醇亚硝化反应的胶束介导速率。在同等酸浓度下,烯醇亚硝化反应速度比酯水解反应速度快10倍以上;这一事实使得对 ECHC 所经历的两种反应进行单独(独立)研究成为可能。十二烷基硫酸钠,SDS的阴离子胶束,抑制酯水解;相比之下,当 [SDS] 增加到超过临界胶束浓度时,亚硝化反应会达到最大值。在研究十二烷基硫酸氢阴离子胶束 HDS 对两个反应速率的影响的研究中观察到类似的行为模式:酯水解的一级速率常数 (ko) 通过最小值为 [HDS ] 增加,即使添加 HDS 对费率的影响实际上很小;与此形成鲜明对比的是,亚硝化反应的总速率常数通过 HDS 增强...