Dimesitylboron stabilised carbanions react with diarylketones to give the corresponding alkenes in mild conditions with good yields. Reactions with aromatic aldehydes are more complex, but in all cases E-alkenes are available in good yields by trapping the intermediates with chlorotrimethylsilane followed by treatment with aq. HF/CH3CN. Treatment of the same intermediates with trifluoroacetic anhydride
Dimesitylboron稳定的碳负离子与二芳基酮反应,在温和的条件下以良好的收率得到相应的烯烃。与芳族醛的反应更复杂,但是在所有情况下,通过用
氯三甲基
硅烷捕获中间体,然后用
碳酸氢钠水溶液处理,可以以高收率获得E-烯烃。HF / CH 3 CN。用
三氟乙酸酐处理相同的中间体主要得到Z-烯烃。考虑了这些重要过程的设计和机制。