3-dioxolane. Evidence is presented that the unusual stability of the former ionic species is due to the steric hindrance towards endo attack by bromide ion, thus leading to the succinimido compound which by action of hydrobromic acid formed insitu, yields the former ionic species which finally gives the dioxolane ring-opening products. Some factors influencing the efficiency of the NBS reaction with hindered
NBS与融合在双环[2.2.1]骨架上的
1,3-二氧戊环的反应涉及两个中间体,二
氧戊环鎓离子和2-琥珀
酰亚胺基-
1,3-二氧戊环。证据提出,前者的离子种类的不同寻常的稳定性是由于朝向空间位阻内由
溴离子攻击,从而导致琥珀
酰亚胺化合物,其由形成
氢溴酸的作用在原位,得到前者的离子种类,其最终使二
氧戊环开环产品。指出了影响二
氧戊环受阻的
NBS反应效率的一些因素。