Reactions of 4-Nitrophenyl 2-Thiophenecarboxylates with R<sub>2</sub>NH/R<sub>2</sub>NH<sub>2</sub><sup>+</sup>in 20 mol % DMSO (aq). Effects of 5-Thienyl Substituent and Base Strength
作者:Sang Yong Pyun、Bong Rae Cho
DOI:10.5012/bkcs.2013.34.7.2036
日期:2013.7.20
value increased with a stronger electron-withdrawing 5-thienyl substituent, the Hammett plots arelinear except for X = MeO, and Yukawa-Tsuno plots are linear with ρ = 0.79-1.32 and r = 0.28-0.93,respectively. The ρ value increased and r value decreased with a stronger nucleophile, indicating an increase inthe electron density at the C=O bond and a decrease in the resonance demand. These results have
值随着吸电子 5-噻吩基取代基的增加而增加,Hammett 图是线性的,除了 X = MeO,Yukawa-Tsuno 图是线性的,ρ = 0.79-1.32 和 r = 0.28-0.93,分别。随着亲核试剂的增强,ρ值增加,r值降低,表明C=O键处的电子密度增加,共振需求减少。这些结果被解释为随着反应性的增加,过渡态的 NC 键形成增强。关键词:氨解、Bronsted 型图、Hammett 图、Yukawa-Tsuno 图