M. Mesic et al., REARRANGEMENT OF BICYCLO[3.2.0]HEPTYL PRECURSORS TO THE 7-NORBORNYL CATION IN THE CRYOGENIC SBF5 MATRIX, Perkin transactions. 2, (6), 1994, pp. 1135-1137
The first direct observation by IR spectroscopy in the cryogenic SbF5
matrix was made of the rearrangement of 2- and 3-chlorobicyclo[3.2.0]h
eptanes (3) and (4), respectively, to the 7-norbornyl cation 1 and its
subsequent transformation into the 2-norbornyl cation 5.