UnNvorsity of Selones and Teehnology of China 175℃ CH3 （Z,E)-2,4-己二烯 顺旋 两种顺旋： CH3 结果一样 H CH3 175℃ CH3 顺旋 H (Z,E)-2,4-己二烯 CH3 CH3 H 175C 顺旋 （Z,2)-2,4-己二烯 电环合与开环 CH3 H 是逆反应 0 CH3 CH3 175C 遵守同一规则 (E,E)-2,4-己二烯 顺旋 CH3 Organic ChemUniversity of Science and Technology of China Organic Chem 两种顺旋： 结果一样 电环合与开环 是逆反应 遵守同一 规则 CH3 CH3 CH3 CH3 175℃ 顺旋 175℃ 顺旋 （Z,E）－2,4－己二烯 （Z,E）－2,4－己二烯 CH3 H H CH3 CH3 H H CH3 CH3 CH3 175℃ 顺旋 175℃ 顺旋 （Z,Z）－2,4－己二烯 CH3 CH3 CH3 CH3 H H H H CH3 CH3 （E,E）－2,4－己二烯