Mechanisms for reactions of halogenated compounds. Part 5. Orientating effects of fluorine substituents on nucleophilic substitution in naphthalene and other polycyclic systems
作者:Richard D. Chambers、Mark J. Seabury、D. Lyn H. Williams、Nigel Hughes
DOI:10.1039/p19880000251
日期:——
deactivating when attached directly to these sites. Fluorine at ortho-positions activates. These results enable a simple model, which accounts for orientation of nucleophilic aromatic substitution, to be extended to perfluoropolycyclic compounds.
在多氟萘中,相对于甲醇中甲醇的攻击位置,已经确定了氟原子作为邻位和远端环上取代基的取代基的单独活化作用。氟在过渡态中邻近高电荷密度中心的远端环中的位点激活,但直接连接到这些位点时,氟会略微失活。邻位的氟被激活。这些结果使一个简单的模型,其解释了亲核芳香族取代的方向,可以扩展到全氟多环化合物。