皮皮学，免费搜题
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【单选题】
共轭二烯烃与具有不饱和键的化合物进行( ),生成环状化合物的反应,称为双烯合成或狄尔斯 - 阿尔德( Diels-Alder )反应。
A.
1 ， 2- 加成
B.
1 ， 3- 加成
C.
1 ， 4- 加成
D.
2 ， 3- 加成
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