The effect of steric interactions on the regioselectivity of fluorination of para alkyl substituted phenols was investigated and the strong effect of size of the alkyl substituent, the structure of the F–N reagent and the solvent on the site of fluorination was established. The course of reaction obeyed a second order rate equation, while the fluorination process required higher ΔH≠ activation than
研究了空间相互作用对对烷基取代
酚的
氟化区域选择性的影响,并确定了烷基取代基的大小,F-N试剂的结构和溶剂对
氟化位点的强烈影响。反应过程服从二级速率方程,而
氟化过程需要比氧化或氧化脱甲基更高的ΔH ≠活化。溶剂极性变化对官能化速率的影响很小,同时确定了与ρ + = -2.3的极好的Hammett相关性。