“…It is worth pointing out that starting from certain substrates, unusual selectivity can be observed with respect to the cyclopropane ring-opening, i.e. with cleavage of the distal cyclopropane bond relative to the nitrogen atom(Schemes 60 and 61) 161,167,174,175,176. Direct heterolytic rupture of this bond is a distinct possibility in these examples, the resulting cationic centre being tertiary and stabilised by mesomeric effect.…”