hydrocarbons, and this shows that the intermediate leading to allene is lithium carbenoid (or α-bromocyclopropyllithium) rather than free cyclopropylidene. Addition of organolithium or a Grignard reagent to carbonyl compounds proceeds dissymmetrically to afford carbinols of up to 22% optical purity. Finally lithiation of ethylbenzene with n-BuLi has been examined in the presence of (-⊃-sparteine and
在
有机锂和
镁化合物与手性叔二胺(-)-
天冬氨酸络合的反应中观察到不对称诱导。用这种络合的n-BuLi脱除宝石-二
生物环丙烷的
溴化物,得到旋光性烯丙烃,这表明导致烯丙基的中间体是烯基
锂(或α-
溴环
丙基锂),而不是游离的环亚丙基。向羰基化合物中添加
有机锂或
格氏试剂不对称地进行,得到光学纯度高达22%的
甲醇。最后,在(-β-
天冬氨酸)存在下,用n-BuLi对乙苯进行了
锂化反应,得到的α-
苯乙基锂络合物产生了光学活性产物。