CH3CH=CH-CH=CH2 + Br2?

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CH3CH=CH-CH=CH2+Br2?CH3CH=CH-CH=CH2+Br2?CH3CH=CH-CH=CH2+Br2?CH3CH=CH-CH=CH2+Br2→CH3CH=CH-CH-CH2+CH3C

CH3CH=CH-CH=CH2 + Br2?
CH3CH=CH-CH=CH2 + Br2?

CH3CH=CH-CH=CH2 + Br2?
CH3CH=CH-CH=CH2 + Br2→CH3CH=CH-CH-CH2 +CH3CH-CH=CH-CH2
┃ ┃ ┃ ┃
Br Br Br Br
(1,2-加成) (1,4-加成)
1,2-加成和1,4-加成产物的比例取决于反应条件,一般在较高的温度下以1,4-加成产物为主,在较低的温度下以1,2-加成产物为主.