and B). Using electrospray ionization for transferring ions directly from solution to the gas phase, and mass spectrometry for structural assignments, key cationic palladium intermediates have been successfully intercepted and structurally characterized for the first time for this type of reaction.
在亚
化学计量的Pd(p)存在下,研究了烯酸酯Z - 1a,b,E - 1a,E - 2a - d,Z -2e,2f和邻
碘酚(4a - f)之间的串联Heck内酯化反应。OAc)2或PdCl 2,在有利于阳离子机理的实验条件下(条件A,B和C),生成
香豆素5a - f和6a - e。在
水性条件下(条件A和B)获得中等至极好的收率。使用电喷雾电离将离子直接从溶液转移到气相,并通过质谱进行结构分配,对于这种类型的反应,关键的阳离子
钯中间体已成功被成功拦截并对其结构进行了首次表征。