Solvent effect as the result of frontier molecular orbital interaction. V. Diels-Alder with heterodienophiles: a unified approach to the solvent effect of the Diels-Alder reactions
作者:G. Desimoni、G. Faita、P.P. Righetti、L. Toma
DOI:10.1016/s0040-4020(01)90093-6
日期:1990.1
The solventeffect of Diels-Alder (D.A.) reactions with heterodienophiles was measured in several solvents.
The solvent effect on the retro Claisen rearrangement was kinetically investigated in 17 solvents. The rate constants were found to be a linear function of the Reichardt's ET(30) solvent polarity parameter. The rate was measured in 3 lithium perchlorate-methanol solutions, their ET(30) values determined, and the kinetic data found to lie on the previous linear relationship. Hence the solvent effect
在17种溶剂中动力学研究了溶剂对逆Claisen重排的影响。发现速率常数是Reichardt E T(30)溶剂极性参数的线性函数。该速率是在3种高氯酸锂-甲醇溶液中测量的,确定了它们的E T(30)值,并且发现动力学数据取决于先前的线性关系。因此,逆向克莱森重排的溶剂效应(以及活化参数)证实了在过渡态中具有部分电荷分离的协同反应的性质,如先前在正向过程中所证明的。