BrCH=CHBr\mathrm{BrCH}=\mathrm{CHBr}BrCH=CHBr
Br2CH−CHBr2\mathrm{Br}_{2} \mathrm{CH}-\mathrm{CHBr}_{2}Br2CH−CHBr2
Br2CH−CHCl2+CHCl3\mathrm{Br}_{2} \mathrm{CH}-\mathrm{CHCl}_{2}+\mathrm{CHCl}_{3}Br2CH−CHCl2+CHCl3
Cl2CH−CHBr2+CHBr3\mathrm{Cl}_{2} \mathrm{CH}-\mathrm{CHBr}_{2}+\mathrm{CHBr}_{3}Cl2CH−CHBr2+CHBr3