Methyl transfer reactivity of pentachloromethylplatinate(IV) anion with a series of N-nucleophiles
作者:Daniel J. Adams、Brian Johns、Andrei N. Vedernikov
DOI:10.1016/j.jorganchem.2018.10.020
日期:2019.2
and the amines. The reactivity is discussed in terms of the amine electronic properties and steric bulk. For the series of N,N-dimethylanilines 1a-1g, Me2NC6H4R (R = H, m-Cl, p-Cl, m-Me, p-Me, p-MeO, p-Me2N), a high quality linear correlation was found between logarithm of the reaction second order rate constant, log(k2), and pKa of the anilines. At the same time, the reactivity of the bulkier N,N-diisopropylaniline
研究了K 2 [Pt IV CH 3 Cl 5 ]对一系列取代的N,N-二甲基苯胺1a-1g,N,N-二异丙基苯胺1h和2,6-取代的吡啶2a-2b的反应性,其含量为60%(vol。 )丙酮水溶液。反应产生相应的N-甲基铵或N-甲基吡啶鎓产物3或4,对底物1a-1g和2b具有高选择性,并遵循整体二级动力学,在Pt IV配合物和胺类化合物中均为一级。根据胺的电子性质和空间体积讨论反应性。对于N,N-二甲基苯胺1a-1g系列,Me 2 NC 6 H 4 R(R = H,m -Cl,p -Cl,m -Me,p -Me,p -MeO,p -Me 2 N ),发现反应二级速率常数的对数,log(k 2)和pK a之间存在高质量的线性相关性苯胺。同时,较大的N,N-二异丙基苯胺底物1h的反应性比使用该相关性预测的反应性低约3个数量级。最后,吡啶2a-2b的反应性比类似pK a的N,N-二甲基苯胺低3-4个数量级。有趣的是,K