Kinetics and Mechanism of the Aminolysis of Aryl N-Isopropyl Thiocarbamates in Acetonitrile
作者:Hyuck-Keun Oh
DOI:10.5012/bkcs.2011.32.11.4095
日期:2011.11.20
The aminolysis reactions of phenyl N-benzyl thiocarbamate with benzylamines in acetonitrile at are investigated. The reactions are first order in both the amine and the substrate. Under amine excess, pseudo-first coefficient () are obtained, plot of vs free amine concentration are linear. The signs of ( and with respect to the sustituent in the substrate and large value indicate that the reactions
研究了苯硫代氨基甲酸苯酯与苄胺在乙腈中的氨解反应。胺和底物的反应都是一级反应。在胺过量的情况下,获得了伪第一系数 (),对游离胺浓度的曲线是线性的。( 和相对于底物中的取代基和大值的符号表明反应进行一致的机制。涉及氘代苄胺亲核试剂的正常动力学同位素效应 (= 1.3 ~ 1.5) 表明氢键合的四中心型过渡态. 激活参数 , 和 , 与此过渡态结构一致。