《有机化学》课程PPT教学课件（Organic Chemistry, William A. Price, Ph.D. PPT, La Salle University, L.G.WADE, JR., 8th Edition）Benzene and Aromaticity（2011）

6元Electrons is Stable 4or8元Electrons is not nonbonding line benzene cyclobutadiene cyclooctatetraene

6 p Electrons is Stable 4 or 8 p Electrons is not

Huckel's Rule:4N+2 (vacant orbitals not shown) (vacant orbitals not shown) open 4e 2e N energy shell N shells ● filled ● ● missing ● shells 2 electrons 4e- 秋 4e 2e aromatic:(4N+2)electrons antiaromatic:4N electrons

Huckel’s Rule: 4N + 2