2,3-Oxaphosphabicyclo[2.2.2]octene 1 reacts with alcohols simultaneously according to two competitive mechanisms: bimolecular addition-elimination and unimolecular elimination-addition with the intermediacy of metaphosphonate Ph-PO 2 ( 2 ). In 1,2-dichloroethane at 60°C, cyclic phosphinate 1 reacts with methanol in the bimolecular reaction five times faster than with tert-butanol. The reaction of metaphosphonate
2,3-Oxaphosphabicyclo[2.2.2]octene 1 根据两种竞争机制同时与醇反应:双分子加成消除和单分子消除加成,中间体为偏
膦酸酯 Ph-PO 2 ( 2 )。在 60°C 的
1,2-二氯乙烷中,环状
次膦酸酯 1 在双分子反应中与
甲醇的反应速度是与
叔丁醇的反应速度的 5 倍。偏
膦酸酯 2 与醇的反应是非选择性的。