1,4-Dienes, vinyl ethers, allyl ethers, allyl thioethers and propene-thiolates are efficiently metalated by butyllithium in the presence of an activator such as potassium t-butoxide. Since the solvent, the counter-ion or the temperature may be varied before subsequent treatment with an electrophilic reagent, the critical ratio of direct vs. vinylogous attack (substitution at the α- or γ-position, respectively)
在活化剂例如
叔丁醇钾的存在下,丁基
锂有效地
金属化了1,4-二烯,
乙烯基醚,
烯丙基醚,烯丙基
硫醚和
丙烯硫醇酯。由于在随后用亲电试剂处理之前,溶剂,抗衡离子或温度可能会发生变化,因此直接与的临界比率为。通常可以在较大的范围内调整
乙烯树脂的进攻(分别在α-或γ位置取代)。在许多情况下,也可以实现立体选择性。