ORGANIC CHEMISTRY Chapter l 1.13b Cis-Trans isomerism CH3 CH CH3 C-C H H CH H cis-2-Butene trans-2-Butene 顺-2-丁烯 反-2-丁烯 o The compound with substituents on the same side of the double bond is referred to as cis-isomer the isomer with substituents on opposite side is trans o The two compounds differ only in the arrangement of their atoms in space. Isomer of this kind are classified formally as stereoisomers(立体异构体) Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 1.13B Cis-Trans Isomerism C C CH3 H H CH3 C C CH3 CH3 H H cis-2-Butene trans-2-Butene 顺-2-丁烯 反-2-丁烯 The compound with substituents on the same side of the double bond is referred to as cis-isomer; the isomer with substituents on opposite side is trans. The two compounds differ only in the arrangement of their atoms in space. Isomer of this kind are classified formally as stereoisomers （立体异构体）