作者:Giorgio Cevasco、Sergio Thea
DOI:10.1021/jo990151o
日期:1999.7.1
To gain knowledge on the role played by the nature of the bridge interposed between hydroxyl and carbonyl groups in esters of the title type, in principle able to hydrolyze through dissociative pathways via the conjugate base of the substrate (E1cB mechanism), we have studied the alkaline hydrolyses of 2,4-dinitrophenyl esters in which the pi-system is a biphenyl, azobenzene, benzylideneaniline, or
为了了解标题类型的酯中羟基和羰基之间插入的桥的本质所起的作用,原则上能够通过底物的共轭碱基通过解离途径进行水解(E1cB机理),我们研究了碱性水解2,4-二硝基苯酯,其中pi系统是联苯,偶氮苯,亚苄基苯胺或二苯乙烯骨架。动力学数据,例如反应性比较和Arrhenius参数,表明这些底物通过通常的缔合B(Ac)2机理发生反应。从结构和精力的角度讨论和解释了这一结果。数据表明,对于亚苄基氨基取代基(C(6)H(5)CH = N-),最合适的sigma(p)()值是0.0。