Concerted [4+2] and stepwise [2+2]cycloadditions of the triphenylallenyl cation with cyclopentadiene
作者:Herbert Mayr、Englbert Bäuml
DOI:10.1016/s0040-4039(00)81406-9
日期:——
generated in situ under different conditions, reacts with cyclopentadiene via allyl cations 7 and 9. The exclusive formation of 7 from 12 and FSO3H proves a concerted [4+2]cycloaddition leading to 9 and suggests a stepwise [2+2]cycloaddition reaction to give 7.
在不同条件下原位生成的三苯基烯基阳离子(5)通过烯丙基阳离子7和9与环戊二烯反应。由12和FSO 3 H独家形成7证明了一致的[4 + 2]环加成反应导致9并暗示逐步进行[2 + 2]环加成反应,得到7。