Elimination Reactions of (E)-2,4,6-Trinitrobenzaldehyde O-Aryloximes Promoted by R<sub>3</sub>N/R<sub>3</sub>NH<sup>+</sup>in 70 mol% MeCN(aq). Effect of β-Aryl Group the Nitrile-Forming Transition-State
作者:Sang-Yong Pyun、Woong-Sub Byun、Bong-Rae Cho
DOI:10.5012/bkcs.2011.32.6.1921
日期:2011.6.20
Nitrile-forming eliminations from (1) promoted by in 70 mol % MeCN(aq) have been studied kinetically. When X = , the reactions exhibited second-order kinetics as well as Brnsted = 0.63 and = 0.34-0.46, and an E2 mechanism is evident. As the leaving group was made poorer (X = H, Cl, and ), Brnsted value increased from 0.63 to 0.85-0.89 without much change in the value E2, indicating that structure of
已对 70 mol% MeCN(aq) 促进的 (1) 中的腈形成消除进行了动力学研究。当 X = 时,反应表现出二级动力学,Brnsted = 0.63 和 = 0.34-0.46,E2 机理明显。随着离去基团变差(X = H、Cl 和 ),Brnsted 值从 0.63 增加到 0.85-0.89,而 E2 值没有太大变化,表明过渡态结构变为具有广泛键的 E1cb 样裂解,在-碳处产生显着的负电荷,以及有限的-OAr键裂解。