Carcinogenic aromatic hydrocarbon Natural compounds contain benzene ring o ". H 7.8-Dydro 己烯雌酚 Daidzein(大豆素) Natural compounds contain Aromaticity(芳香性) benzene ring 高碳氢比 OH 键长平均化 ·分子成环状平面 ·特殊的光谱性质 ·环上的氢受到环电流效应 OH O OH Hypericum perforatum Hypericin ·易取代、难加成、难氧化 (贯叶连翘) (金丝桃素) Huickel rule Aromatic compounds 由sp杂化原子组成的平面单环系统，若具有 4+2个π电子，即有相当的电子稳定性，即 芳香性 Planar.fully conjugated,monocyclic systems with (4n+2)n electrons have a closed shell ofelectrons 奥 all in bonding orbitals and are exceptionally stable. (azulene) Such systems are said to be aromatic 99 Prepared by Yang R. L. Carcinogenic aromatic hydrocarbon Prepared by Yang R. L. Natural compounds contain benzene ring O O HO OH Daidzein (大豆素) HO OH 己烯雌酚 Prepared by Yang R. L. Natural compounds contain benzene ring Hypericum perforatum (贯叶连翘) OH O OH O OH OH CH3 CH3 HO HO Hypericin (金丝桃素) Prepared by Yang R. L. Aromaticity (芳香性) • 高碳氢比 • 键长平均化 • 分子成环状平面 • 特殊的光谱性质 • 环上的氢受到环电流效应 • 易取代、难加成、难氧化 Prepared by Yang R. L. Hückel rule 由sp2杂化原子组成的平面单环系统，若具有 4n+2个p电子，即有相当的电子稳定性，即 芳香性 Planar, fully conjugated, monocyclic systems with (4n+2)π electrons have a closed shell of electrons all in bonding orbitals and are exceptionally stable. Such systems are said to be aromatic Prepared by Yang R. L. 奥 (azulene) Aromatic compounds