Sec 1 Structure and Stability -Each carbon contributes a p orbital Six p orbitals overlap to give cyclic p system;闭合的共 轭体系（环状π电子流） -Six p electrons delocalized throughout p system 离域（无单双键之分） -High electron density above and below plane of ring 面结构，键角为1200，Planar Sec 1 Structure and Stability ▪Each carbon contributes a p orbital ▪Six p orbitals overlap to give cyclic p system;闭合的共 轭体系(环状电子流) ▪Six p electrons delocalized throughout p system 高度 离域(无单双键之分) ▪High electron density above and below plane of ring 平 面结构，键角为1200 ，Planar