Reactive organometallic compounds such as allyl-zinc, -magnesium,-lithium and saturated lithium compounds are shown to readily undergo addition reactions with functionally conjugated enynes: HCCC(R)C(R′)(CH2)nR″ (R″ = OH, OC4H9, NHC2H5N(C2H5)2), but the reactivity is reduced when the steric hindrance around the double bond is increased. With each organometallic compound used, this reaction is
活性有机
金属化合物(例如烯丙基
锌,
镁,
锂和饱和
锂化合物)容易与功能共轭的
炔烃发生加成反应:HCCC(R)C(R')(CH 2)n R″(R″ = OH,OC 4 H 9,NHC 2 H 5 N(C 2 H 5)2),但是当双键周围的空间位阻增加时,反应性降低。对于使用的每种有机
金属化合物,该反应是区域选择性的:与
有机锌化合物进行3,4加成,与
有机锂化合物(烯丙基,丁基-)加成1,2,以及
有机镁化合物进行1,2和1,4加成。