Halogens in γ-position enhance the acidity of alkyl aryl sulfones and alkane nitriles
作者:M. Judka、A. Wojtasiewicz、W. Danikiewicz、M. Mąkosza
DOI:10.1016/j.tet.2007.06.014
日期:2007.9
On the basis of measuring the rates of base-catalyzed deuterium exchange the pKa values of a series of 3-halopropyl aryl sulfones and 4-halobutyronitriles were estimated. It was shown that halogen substituents, although separated from the carbanionic site, exert a substantial carbanion stabilizing effect. These effects were rationalized by DFT calculations.
在测量碱催化的氘交换速率的基础上,估算了一系列3-卤代丙基芳基砜和4-卤代丁腈的p K a值。结果表明,卤素取代基尽管与碳负离子位点分开,但发挥了相当大的碳负离子稳定作用。通过DFT计算合理化了这些影响。