Sec 1 Structure Physical Properties Each carbon contributes a p orbital Six p orbitals overlap to give cyclic p system; 合的共轭体系（环状π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，PlanarSec 1 Structure & Physical Properties ❖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