Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States ...

Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, China ...

HIGMAN 1 recently suggested a new mechanism for the Beckmann rearrangement which postulates that the cation (I) rearranges by rotation of the central > C = N < unit through 90° to form (II).