Treatment of silyl enol ethers of various carbonylcompounds with Et2Zn and fluoroalkyl halides (Rf–X) in the presence of RhCl(PPh3)3 in DME gave the corresponding α-Rf carbonylcompounds. A highlyreactive alkyl-rhodium complex which was derived from RhCl(PPh3)3 and Et2Zn must be crucial in this reaction by accelerating the reaction rate and improving the yields dramatically. This reaction overcomes
在RhME(PPh 3)3存在下,在DME中用Et 2 Zn和氟代烷基卤化物(R f –X)处理各种羰基化合物的甲硅烷基烯醇醚,得到相应的α- Rf羰基化合物。衍生自RhCl(PPh 3)3和Et 2 Zn的高反应性烷基铑络合物必须通过加快反应速率和显着提高产率来在该反应中发挥关键作用。该反应克服了由于R f –X的反极化而在合成α- Rf羰基化合物时遇到的困难。
Triethylborane induced perfluoroalkylation of silyl enol ethers or germyl enol ethers with perfluoroalkyl iodides
Reaction of perfluoroalkyl iodides with silyl enol ethers mediated by Et3B in the presence of a base provides perfluoroalkylated silyl enol ethers. Meanwhile, treatment of germyl enol ethers with perfluoroalkyl iodides affords β-perfluoroalkyl ketones in good yields.