Electrophilic ring opening of trans-2-phenylcyclopropylamine·HCl occurs at the distal (C2–C3) bond. This is consistent with weakening of the distal bond by the σ-withdrawing ammonium group and charge–charge repulsive effects in the transition state.
反式-
2-苯基环丙胺·HCl 的亲电开环发生在远端(C 2 -C 3)键上。这与在过渡态中通过 σ 吸收
铵基团和电荷 - 电荷排斥效应减弱远侧键是一致的。