Overview

Localization energies L(+) and L(-) for electrophilic and nucleophilic attack at an aromatic center are calculated by the Huckel method. The smaller L(+) or L(-) means more reactive atomic location. Order of atoms in E(+) or in Nu(-) attack are adjusted according to their localization energies. The total pi energy, the pi electron density and the total electron density are also calculated by the Huckel method.