Kinetics and mechanism of the anilinolyses of aryl dimethyl, methyl phenyl and diphenyl phosphinates
作者:Nilay Kumar Dey、Chan Kyung Kim、Hai Whang Lee
DOI:10.1039/c0ob00517g
日期:——
The reactions of Z-aryl dimethyl (1), methyl phenyl (2), and diphenyl (3) phosphinates with X-anilines in dimethyl sulfoxide at 60.0 °C are studied kinetically. Kinetic results yield the primary normal deuterium kinetic isotope effects (DKIEs) involving deuterated aniline (XC6H4ND2) nucleophiles, kH/kD = 1.03–1.17, 1.15–1.29, and 1.24–1.51, and the cross-interaction constants (CICs), ρXZ = 0.37, 0
Z-芳基二甲基(1),甲基苯基(2)和联苯(3)与X-苯胺的次膦酸盐二甲基亚砜在60.0°C下进行了动力学研究。动力学结果产生基本法线氘 涉及氘的动力学同位素效应(DKIE) 苯胺 (XC 6 H 4 ND 2)亲核试剂k H / k D = 1.03-1.17、1.15-1.29和1.24-1.51,以及交叉相互作用常数(CIC),ρ XZ= 0.37,0.34,和0.65 1,2,和3,分别。配体(R 1和R 2)对反应速率的空间效应起作用,但与其他反应相比要小得多次膦酸酯系统。基于CICs的正号,提出了一种具有限速的离去基团从中间体中逐出的逐步机制。主要的正面亲核攻击通过氢键合的,四-中心型过渡状态,提出了原代正常DKIEs和CIC的用于大幅度的基础上2和3,而这两个正面和背面攻击提出相对小的一次正常DKIEs的用于基础上1。