almost four order of magnitude larger than that of the trimer (kT), suggesting a higher electrophilicity of the 3H‐indolium cations with respect to the protonated dimer (which is an aliphatic ammonium salt). Further indole addition to the trimer, which is a protonated 2‐alkyl‐aniline, does not occur, since the anilinium ion is ineffective as an electrophile. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet
报道了在298 K
硫酸水溶液中
吲哚二聚和三聚的反应速率和平衡常数。在约4-5小时内达到低聚平衡,未观察到具有三个以上单体单元的低聚物的形成。
吲哚的质子化平衡影响
吲哚二聚体的形成平衡,这意味着
吲哚的p K IH值强烈影响整个过程的平衡和动力学。在动力学常数的评估中,已考虑到
吲哚的p K IH值。这样,二聚体(k D)的形成动力学常数几乎比三聚体(k D)大四倍。k T),表明
3H-吲哚阳离子相对于质子化的二聚体(其为脂肪族
铵盐)具有更高的亲电性。由于
苯胺离子不能用作亲电试剂,因此不会再向三聚体中添加
吲哚,而后者是质子化的2-烷基
苯胺。分级为4 +©2008 Wiley Periodicals,Inc. Int J Chem Kinet 41:107-112,2009