Upon HCOOH reaction of ethoxylactams - the terminally unsubstituted allenes and underwent a [3,3] sigmatropic rearrangement. The dimethyl allenes 1b and 1c afforded only products from an α-acyliminium ion cyclisation.
在乙氧基内酰胺的HCOOH反应-末端未取代的亚丙基上,发生[3,3]σ重排。二甲基烯丙基1b和1c仅提供α-酰基
亚胺离子环化的产物。