作者:Richard D. Chambers、Peter A. Martin、Graham Sandford、D. Lyn H. Williams
DOI:10.1016/j.jfluchem.2008.04.009
日期:2008.10
The effect of fluorine as a substituent group on nucleophilic aromatic substitution is discussed, where a fluorine atom located ortho to the point of substitution may be of variable activating influence, whereas fluorine located para is slightly deactivating and meta is activating. A rationale of these effects is presented and evidence to support polar influences by ortho fluorine is advanced. The
讨论了氟作为取代基对亲核芳族取代的影响,其中位于邻位的氟原子可能具有可变的激活影响,而位于对位的氟则略微失活,而间位则被激活。提出了这些效应的原理,并提出了支持邻氟对极性影响的证据。CN,CF 3,CF 2 H和CFH 2的影响也可以通过比较合适的测得的速率常数并与环氮的活化作用来确定。