The regioselectivity and reactivity of silylation of an allenyl–prop-2-ynyllithium reagent is different when a squential or in situ Li/Sn exchange is used to prepare it; the evidence points to a solvent-separated ion pair as the transient species trappe during the in situ expriment.
当使用顺序或原位Li/Sn交换制备联烯基-丙-2-炔基
锂试剂时,其区域选择性和
硅烷化反应活性有所不同;有证据表明,溶剂分离的离子对是原位实验期间的瞬态物质陷阱。