Kinetics and mechanism of the aminolysis of aryl ethyl chloro and chlorothio phosphates with anilines
作者:Md. Ehtesham Ul Hoque、Nilay Kumar Dey、Chan Kyung Kim、Bon-Su Lee、Hai Whang Lee
DOI:10.1039/b713167d
日期:——
acetonitrile at 55.0 degrees C are studied kinetically and theoretically. Kinetic results yield the primary kinetic isotope effects (k(H)/k(D) = 1.07-1.80 and 1.06-1.27 for 1 and 2, respectively) with deuterated aniline (XC(6)H(4)ND(2)) nucleophiles, and the cross-interaction constants rho(XY) = -0.60 and -0.28 for and , respectively. A concerted mechanism involving a partial frontside attack through a hydrogen-bonded
动力学和理论上研究了乙基Y-苯基氯(1)和氯硫代(2)磷酸酯与X-苯胺在乙腈中在55.0摄氏度下的反应。动力学结果产生了氘代苯胺(XC(6)H(4)ND(2)的主要动力学同位素效应(1和2的k(H)/ k(D)分别为1.07-1.80和1.06-1.27)亲核试剂,以及的交叉相互作用常数rho(XY)= -0.60和-0.28。提出了一种通过氢键,四中心型过渡态参与部分正面攻击的协同机制。大的rho(X)(rho(nuc)= -3.1至-3.4)和beta(X)(beta(nuc)= 1.1-1.2)值似乎是带有离去基团的磷酸盐和硫代磷酸盐的苯胺分解的特征。由于苯胺亲核试剂相对较大,