dependent on the ring size of the product and the position of the substituent that induces the stereoselectivity. The migration of the phenyl group through a semi-pinacol rearrangement during the geminal addition process was confirmed by the results of deuterium labelling studies.
报道了一种直接的方法,用于由
溴离子介导的
乙烯基芳烃的立体选择性抗马尔科夫尼科夫双生二胺化和
化学计量双生二氧化。已经描述了取代基在亲核试剂上的作用和杂原子在竞争性孪生和邻位加成途径中的亲核性。孪生双氧化的立体选择性取决于产物的环大小和引起立体选择性的取代基的位置。
氘标记研究的结果证实了在成对过程中苯基通过半
频哪醇重排的迁移。