Secondary lithium dialkylcuprates react with αβ-ethylenic aldehydes to give a mixture of 1,2 and 1,4 addition products. Only 1,2 addition products are obtained with allylic and acetylenic cuprates whereas homallylic, phenyl and vinylic cuprates give 1,4 addition products. The ratio also depends on the nature of the metal in the cuprate (Mg or Li). Thus chloromagnesium dimethyl cuprate, in THF, is the
仲烷基二烷基
碳酸锂与αβ-
乙烯醛反应,生成1,2和1,4加成产物的混合物。用烯丙基和炔属
铜酸盐仅获得1,2加成产物,而烯丙基,苯基和
乙烯基铜酸盐得到1,4加成产物。该比例还取决于
铜酸盐(Mg或Li)中
金属的性质。因此,在THF中的
氯镁二甲基
铜酸
镁是产生1,4加成产物的最有利的化合物。