2-Chloro- and 2-bromo-1,1-di(-p-nitrophenyl)ethylenes were prepared, and nucleophilic displacement of halide ions by ethoxide ion was kinetically studied in the range 20–50°. α-Elimination did not interfere. Rates of second-order substitution are ca. 106 times larger than for 2-halogeno-1,1-diphenylethylenes. Kinetic data referring to H, Me, MeO, and NO2 as p- and/or p′-substituents can be correlated
制备了2-
氯-和2-
溴-1,1-二(-对-
硝基苯基)
乙烯,并在20-50°范围内动力学研究了乙氧基对卤离子的亲核取代。α-消除没有干扰。二级替代率约为。比2-卤代-1,1-二苯基
乙烯大10 6倍。将H,Me,MeO和NO 2称为p-和/或p'-取代基的动力学数据可以与Σσ或Σσ°的值相关。提出了一种分子轨道计算方法,该方法给出了π电子对活化能的贡献,与活化的实验自由能具有良好的相关性。