烯烃第三章内容提要：1、烯烃的结构2、烯烃的异构现象和命名3、烯烃的物理性质4、烯烃的化学性质
第三章 烯烃 内容提要： 1、烯烃的结构 2、烯烃的异构现象和命名 3、烯烃的物理性质 4、烯烃的化学性质
S3.2烯烃的结构RCH = CHR'，通式：CnH2nsp2-hybridizedC: sp2 Hybrid orbitalsstateExited stateGround state2p11.t11112p2p2sp22s11行PromotionHybri-1slsof electron1sdizationAn sp? orbital1/3 s orbital2/3 p orbital
§3.2 烯烃的结构 sp C: 2 Hybrid orbitals Ground state 2p 2s 1s Promotion of electron Exited state 2p 2s 1s sp2 -hybridized state 1s 2p sp2 Hybridization An sp2 orbital 1/3 s orbital 2/3 p orbital RCH = CHR’ ，通式： CnH2n
Three equivalent sp2hybrid orbitals lie in aplane at angle of 120°to one another.Geometric structure ofC atom with sp?-hybrid:Planartriangle（平面三角）A single unhybridized p orbitalperpendicular to the sp2 plane.In the molecule of Ethylene :The formation of C - Cobond:sp? - sp? overlap
Three equivalent sp2 hybrid orbitals lie in a plane at angle of 120° to one another. Geometric structure of C atom with sp2 -hybrid: Planar triangle(平面三角) A single unhybridized p orbital perpendicular to the sp2 plane. In the molecule of Ethylene : The formation of C _ Cσbond: sp2 _ sp2 overlap
p orbital overlapHHHHo- bondp orbitaloverlap
p orbital overlap H H H H σ- bond p orbital overlap
Carbon-carbon double bondcbond计元bondIt
C C σbond πbond Carbon-carbon double bond