Allylic Rearrangements. XXI. Further Studies Related to the Nature of the Butenyl Grignard Reagent<sup>1</sup>
作者:William G. Young、John D. Roberts
DOI:10.1021/ja01212a024
日期:1946.8
Cleavage of the butenyl Grignard reagent by water gives a mixture of butenes, although the products from a variety of addition and coupling reactions are almost exclusively α-methylallyl derivatives. To gain further information regarding the butenyl Grignard reagent we have turned to the study of some reactions expected to cleave the reagent to butenes through the operation of mechanisms different
丁烯基格氏试剂被水裂解得到丁烯混合物,尽管来自各种加成和偶联反应的产物几乎完全是 α-甲基烯丙基衍生物。为了获得有关丁烯基格氏试剂的更多信息,我们转向研究一些反应,这些反应有望通过与水有关的机制的操作将试剂裂解为丁烯。为了用可烯醇化的酮裂解丁烯基溴化镁,选择了乙异三甲苯,因为一些研究人员已经表明有机金属化合物,如乙基溴化镁、正丁基锂和苯基钠不会添加到该化合物的羰基上,而是专门提供烯醇化产物。与预期相反,丁烯基溴化镁与乙炔基反应产生的烯醇化产物可忽略不计(检测到的丁烯量低于计算量的 3%)。从反应混合物中回收了大约 12% 的原始酮,主要产物是叔醇,α-甲基烯丙基甲基甲醇(I)。收率为83%。