Structure−Reactivity Relationships in the Pyridinolysis of <i>N</i>-Methyl-<i>N</i>-arylcarbamoyl Chlorides in Dimethyl Sulfoxide
作者:Ikchoon Lee、Sung Wan Hong、Han Joong Koh、Yong Lee、Bon-Su Lee、Hai Whang Lee
DOI:10.1021/jo0108212
日期:2001.12.1
cross-interaction constant, rho(XY) approximately equals beta(XY) approximately equals 0. The rate data can be expressed in the Ritchie N(+) type equation. Based on this and other results, the mechanism of nucleophile (pyridine) addition to the resonance- stabilized carbocation is proposed. It has been shown from the definition of beta(XY) (and rho(XY)) together with the Marcus equation that the high intrinsic
N-甲基-N-芳基氨基甲酰氯(YC(6)H(4)N(CH(3))COCl)与吡啶(XC(5)H(4)N)的亲核取代反应已在二甲亚砜中进行了研究45.0摄氏度。选择性参数的一个显着趋势是它们在实验误差范围内是恒定的,rho(X)= -2.25 +/- 0.03,beta(X)= 0.42 +/- 0.01,rho(Y)= 1.10 +/- 0.06,随着亲电子试剂(deltasigma(Y))和亲核试剂(deltasigma(X))的反应性变化,这导致交叉相互作用常数逐渐消失,rho(XY)大约等于beta(XY)近似等于0。速率数据可以用Ritchie N(+)型方程式表示。基于该结果和其他结果,提出了将亲核试剂(吡啶)添加到共振稳定的碳阳离子中的机理。