Reaction of organometallic reagents with ethyl trifluoroacetate and diethyl oxalate. Formation of trifluoromethyl ketones and .alpha.-keto esters via stable tetrahedral adducts
Fluoro-ketones IV. Synthesis of phenylperfluoroalkyl ketones - mechanism of reaction between phenyllithium and fluoroesters
作者:Loomis S. Chen、Grace J. Chen、Christ Tamborski
DOI:10.1016/s0022-1139(00)82308-8
日期:1981.9
Although fluorine containing ketones (RfC(O)Rf and RfC(O)R, Rf = perfluoroalkyl) have been prepared from the reaction between organolithium reagents and perfluoroalkyl esters, the reaction has not found general applicability. Variable yields of ketones and co-production of secondary and tertiary alcohol by-products have in most instances been experienced. We have examined in more detail the factors
尽管已经通过有机锂试剂与全氟烷基酯之间的反应制备了含氟的酮(R f C(O)R f和R f C(O)R,R f =全氟烷基),但是该反应尚未发现普遍适用性。在大多数情况下,酮的产量可变以及仲醇和叔醇副产物的联产。我们已经更详细地研究了影响酮产物和副产物形成的因素,例如温度,加成方式和全氟烷基酯结构。通过控制实验条件,C 6 H 5 C(O)R f的优异收率可以得到化合物。已分离出半缩酮(II)的锂盐,并显示其为酮生产中的活性中间体。盐的稳定性及其与溶剂的潜在反应决定了反应产物的类型。低温有利于半缩酮的锂盐的稳定性,由此在水解时产生高产率的酮。