Kinetics and mechanism of the addition of benzylamines to β-nitrostilbenes and β-cyano-4′-nitrostilbenes
作者:Hyuck Keun Oh、Tae Soo Kim、Hai Whang Lee、Ikchoon Lee
DOI:10.1039/b108021k
日期:2002.1.23
addition in acetonitrile is the direct resonance effect (σ− or R−) while that in aqueous solution is the polar electron-withdrawing effect (σ) of the activating groups. Due to stericinhibition the β-phenyl rings in NSB and CNS are prevented from π-overlap with the anionic center in the TS so that the reduced resonance effect leads to unduly low addition rates. The kinetic isotope effects and activation