Electrophilicity parameters for 2-benzylidene-indan-1,3-diones—a systematic extension of the benzhydrylium based electrophilicity scale
作者:Stefan T. A. Berger、Florian H. Seeliger、Florian Hofbauer、Herbert Mayr
DOI:10.1039/b708025e
日期:——
Kinetics of the reactions of four 2-benzylidene-indan-1,3-diones (1a-d) with carbanions (2a-I) have been studied photometrically in dimethyl sulfoxide solution at 20 degrees C, and the electrophilicity parameters E were determined by the linear free energy relationship log k(2)(20 degrees C) = s(N + E) (eqn (1)). The rate-determining step of these reactions is the nucleophilic attack of the carbon
在20°C的二甲基亚砜溶液中以光度法研究了4种2-亚苄基-茚满-1,3-二酮(1a-d)与碳负离子(2a-I)的反应动力学,并通过线性自由能关系log k(2)(20摄氏度)= s(N + E)(eqn(1))。这些反应的决定速率的步骤是碳亲核试剂在迈克尔受体双键处的亲核攻击。与文献数据的比较表明,线性自由能关系(eqn(1))可以半定量预测2-亚苄基-茚满-1,3-二酮对各种亲核试剂的反应性。