作者:Tadeusz Lemek、Herbert Mayr
DOI:10.1021/jo0344182
日期:2003.9.1
Kinetics of the reactions of stabilized carbanions (derived from nitroethane, diethyl malonate, ethyl cyanoacetate, ethyl acetoacetate, acetyl acetone) with benzylidenemalononitriles have been determined in dimethyl sulfoxide solution at 20 degrees C. The second-order rate constants are employed to determine the electrophilicity parameters E of the benzylidenemalononitriles according to the correlation
已在20°C的二甲基亚砜溶液中测定了稳定的碳负离子(源自硝基乙烷,丙二酸二乙酯,氰基乙酸乙酯,乙酰乙酸乙酯,乙酰丙酮)与亚苄基丙二腈的反应动力学。采用二阶速率常数确定亲电性根据相关方程log k(20摄氏度)= s(E + N),测出亚苄基丙二腈的参数E。与文献数据的比较表明,该方程式可半定量预测亚苄基丙二腈对各种亲核试剂(包括碳负离子,烯胺,胺,水和氢氧化物)的反应性。