Cyclisations of benzyl ortho-iodoaryl ethers to benzo[c]chromenes can be effected without reagents or catalysts by irradiation with UVC under flow. Reactions proceed via triplet aryl cation generation, 5-exo and 3-exo-cyclisations, and rearomatisation. They have wide scope, are easy to effect and extend to a myriad of related ring systems.
苄基邻
碘芳基醚环化成苯并[ c ]色烯可以在没有试剂或催化剂的情况下通过在流动下用U
VC照射来实现。反应通过三线态芳基阳离子生成、5-外型和3-外型环化以及重新芳构化进行。它们的范围很广,很容易实现并扩展到无数相关的环系统。