摘要:
The mechanism for the unusual AlCl3-catalyzed rearrangement of 2,2-dichloronorbornane to 1-chloronorbornane in pentane has been elucidated; the reaction, which also yields four isomeric dichloronorbornanes, occurs in three steps: (1) ionization to form the 2-chloro-2-norbornyl cation, which was fully characterized by two-dimensional H-1 and C-13 NMR in SbF5/SO(2)C1F; (2) Wagner-Meerwein shift to yield the 1-chloro-2-norbornyl cation, which was partially characterized by H-1 NMR; and (3) hydride abstraction.