been developed. The reaction is catalyzed by trityl tetrafluoroborate (TrBF4) and utilizes unactivated alkenes for the olefination of aromatic aldehydes to give trans -alkylstyrenes in yields of 44-85% with only acetone as the byproduct. The pronounced Lewis acidity of the carbocation results in unusual reactivity that is proposed to catalyze a stepwise [2+2] cycloaddition to give an oxetane intermediate
已经开发了直接的有机催化羰基/烯烃羰基合成复分解。该反应由四
氟硼酸三苯甲基酯 (TrBF4) 催化,并利用未活化的烯烃进行芳香醛的烯化,以 44-85% 的产率得到反式烷基
苯乙烯,只有
丙酮作为副产物。碳正离子显着的
路易斯酸性导致了不寻常的反应性,建议催化逐步 [2+2] 环加成反应生成氧杂
环丁烷中间体。后者在正式的逆 [2+2] 反应中断裂,得到氧化复分解产物。