In the competitive cyclisation of 7 to give 9 and 10, all substituents in the 3â² and 4â² positions increased the overall reaction rate relative to that of the 2-phenyl ring; 6-alkenyl and -thienyl groups also reacted faster than the 2-phenyl ring.
在对 7 进行竞争性环化反应生成 9 和 10 的过程中,3â² 和 4â² 位置上的所有取代基都提高了 2 苯环的整体反应速度;6-烯基和-
噻吩基的反应速度也快于 2 苯环。