以σ～△～E^H^O度量取代基电子效应强度的定量判据

本文计算的σ～△～E^H^O和σ△E^L^U值, 应用于苯系Ph(X)n六十多个分子的亲电或亲核反应活性比较, 结果同文献实验数据。σ～△～E^H^O值与分子间或分子内亲电反应活性呈正平行关系, 而σ～△～E^L^U值则正好相反, 但是CN、CF3和F取代基则例外。

σ～△～E^H^O as a quantitative critertion of the measurement of the electronic effect of substituents

Comparison of the calculated σ～△～E^H^O or σ～△～E^L^U values with the electrophilic or nucleophilic reactivities at benzene ring of more than sixty Ph(X)n molecules taken from the experimental data found in literature has been carried out. The σ～△～E^H^O value accupately be positively parallel to the intramolecular and intermolecular electrophilic reactivity and vice versa for the σE^L^U value, while the cases of CN, CF3 and F groups are exceptional.