Electrophiles attack preferentially at the C(5) position of 2-norborn-5-enone and 2-bicyclo[2.2.2]oct-5-enone whereas the C(6) position is preferred for 2-chloronorborn-5-ene-2-carbonitriles and 2-chlorobicyclo[2.2.2]oct-5-ene-2-carbonitriles.
亲电试剂优先攻击2-norborn-5-enone和2-双环[2.2.2] oct-5-enone的C(5)位置,而C(6)位置更适合2-chloronorborn-5-ene- 2-腈和2-
氯双环[2.2.2]辛-5-烯-2-腈。