Rearrangements of hexaalkylhydrazine dications [R3N+ N+ R3] to a-amino ammonium cations [R3N+ CHR'Nb] derived by Hofmann-like degradation (loss of an a proton and NN bond cleavage to give an amino immonium cation, followed by addition of the amino group to the C= N+ bond) are investigated. Tricyclic dications 62+ and lo2+ give 14'and 8+, respectively, showing high selectivity for hydrogen loss from the methylenes in the bicyclo ...