Chloroform as a Hydrogen Atom Donor in Barton Reductive Decarboxylation Reactions
作者:Junming Ho、Jingjing Zheng、Rubén Meana-Pañeda、Donald G. Truhlar、Eun Jung Ko、G. Paul Savage、Craig M. Williams、Michelle L. Coote、John Tsanaktsidis
DOI:10.1021/jo400927y
日期:2013.7.5
decarboxylations and to determine the scope of this process. The results from this study show that hydrogen atom transfer from chloroform occurs directly under kinetic control and is aided by a combination of polar effects and quantum mechanical tunneling. Chloroform acts as an effective hydrogen atom donor for primary, secondary, and tertiary alkyl radicals, although significant chlorination was also observed
氯仿同时作为溶剂和范围的羧酸的巴顿还原脱羧氢原子供体的用途最近已证明(KO,EJ等人,有机化学快报。2011,13,1944年)。在目前的工作中,进行了电子结构计算,直接动力学计算和实验研究的组合,以研究氯仿如何在Barton还原性脱羧反应中充当氢原子供体,并确定该过程的范围。这项研究的结果表明,氯仿中的氢原子转移直接在动力学控制下发生,并且受极性效应和量子力学隧穿的共同作用。氯仿可作为伯,仲和叔烷基的有效氢原子供体,尽管未应变的叔羧酸也可观察到明显的氯化反应。