A new generation of “instant ylids”: Powder mixtures of phosphonium salts and potassium hydride as storable precursors to wittig reagents
作者:Mirella El-Khoury、Qian Wang、Manfred Schlosser
DOI:10.1016/s0040-4039(96)02084-9
日期:1996.12
rapidly when tert-butyl methyl ether is added under stirring. When, in general after a few minutes, the generation of the (triphenyl-phosphonio)alkanide is complete, it can be immediately used for the Wittig olefination of a carbonyl compound. Compared to sodium amide based “instant ylids”, the new blends offer little advantage as long as simple phosphonium salts are ingredients but they extend considerably
将细粉状的烷基三苯基phosph盐和氢化钾以1:1的摩尔比混合,得到一种即用型粉末,当在搅拌下添加叔丁基甲基醚时,其成分会迅速反应。一般在几分钟后,当(三苯基-膦酰基)烷化物的生成完成时,可以立即将其用于羰基化合物的维蒂希烯化。与基于酰胺钠的“即时脂质”相比,只要简单的phospho盐为成分,这种新混合物就没有什么优势,但是它们大大延长了含杂取代衍生物(如甲硫基甲基或吡啶基三苯基phosph盐)的混合物的保质期。