Rearrangement of 3-Membered 1,1,2-Trifluorobromonium and Iodonium Ions and Comparison of Trifluorochloronium to Fluorocarbenium Ions
作者:Dale F. Shellhamer、Kevyn J. Davenport、Heidi K. Forberg、Matthew P. Herrick、Rachel N. Jones、Sean J. Rodriguez、Sunamita Sanabria、Nicole N. Trager、Ryan J. Weiss、Victor L. Heasley、Jerry A. Boatz
DOI:10.1021/jo800472e
日期:2008.6.1
halonium ion intermediates are 11 to 27 kcal/mol more stable than the three-membered-ring halonium ions or the open-ions A and E. The five-membered-ring intermediates lead to rearranged products. Rearranged products increase as the number-4 halogen (Z) becomes more nucleophilic (Z: Cl < Br < I). Open chloronium ions from ionic chlorination of terminal fluorovinyl alkenes are compared to the open ions generated
氯的反应(CL 2与4-卤代-1,1,2-三氟-1-烯烃()1,2,或3)得到开放离子中间体甲和Ë是处于平衡状态。当4号卤素取代基为碘时,在3的离子氯化过程中,开氯鎓离子(E)重排为五元环ha离子。从烯烃三元环溴鎓和碘鎓离子1,2,或3相当对称,结构相似。量子化学计算表明,五元环ha离子中间体比三元环ha离子或开环离子A和E稳定11至27 kcal / mol 。五元环中间体导致重新排列的产品。随着4号卤素(Z)变得更亲核(Z:Cl