Preparation and synthetic utility of fluorinated phosphonium salts, -phosphonium salts and phosphoranium salts [1]
作者:Donald J. Burton
DOI:10.1016/s0022-1139(00)81218-x
日期:1983.10
fluorohalomethanes provides a rapid and high yield synthesis of various types of fluorinated phosphonium salts, bis-phosphonium salts and phosphoranium salts. These salts are useful precursors to fluorine-containing ylides, carbenes and methide ions. Examples of the preparation, mechanism of formation, and syntheticutility of these novel reagents is described.
Metal dehalogenation route to reactive fluoroolefins
作者:D.J. Burton、H.S. Kesling、D.G. Naae
DOI:10.1016/s0022-1139(00)82620-2
日期:1981.9
Metal dehalogenation of bromodifluoromethyltriphenylphosphonium bromide with Cd, Zn, or Hg provides a practical route to fluoroolefins that contain an allylic halogen or a pentafluorophenyl group. No SN2′ or ring substituted products are observed.
Carbonylation of Polyfluorinated 1-Arylalkan-1-ols and Diols in Superacids
作者:Siqi Wang、Yaroslav V. Zonov、Victor M. Karpov、Olga A. Luzina、Tatyana V. Mezhenkova
DOI:10.3390/molecules27248757
日期:——
We describe the carbonylation of a series of mono and dihydroxy derivatives of polyfluorinated alkylbenzenes and benzocycloalkenes with OH groups at benzylic positions using carbon monoxide in the presence of a superacid (TfOH, a TfOH-SbF5 mixture, or a FSO3H-SbF5 mixture). It was shown that the superacid-catalyzed addition of CO to various primary and secondary polyfluorinated alcohols and diols gives
我们描述了在存在超酸(TfOH、TfOH-SbF5 混合物或 FSO3H-SbF5 混合物)的情况下使用一氧化碳在苄基位置具有 OH 基团的多氟化烷基苯和苯并环烯烃的一系列单羟基和二羟基衍生物的羰基化。结果表明,超强酸催化的 CO 加成到各种伯和仲多氟化醇和二醇中会产生相应的一元和二元羧酸或内酯。评估了取决于醇结构的各种超强酸的效率,FSO3H-SbF5 在大多数转化中产生了最好的结果。发现将 CO 加成到含有邻位氟原子的仲 1-arylalkan-1-ols 伴随着 HF 的消除以及 α,β-不饱和芳基羧酸的形成。与伯醇和仲醇相比,
The use of methyl 2,2-difluoro-2-(fluorosulfonyl)acetate as the difluorocarbene source to generate an in situ source of difluoromethylene triphenylphosphonium ylide
作者:Charles S. Thomoson、Henry Martinez、William R. Dolbier
DOI:10.1016/j.jfluchem.2013.02.026
日期:2013.6
Under moderate conditions in the presence of a demethylating reagent, such as iodide, methyl 2,2,-difluoro-2-(fluorosulfonyl)acetate (MDFA) releases difluorocarbene, which in the presence of triphenylphosphine forms difluoromethylene triphenylphosphonium ylide. When the process is carried out also in the presence of aldehydes or activated ketones, the ensuing in situ Wittig-type reaction of the ylide with the carbonyl reactants produces 1,1-difluoroalkenes in good yield. Density Functional Theory calculations were used to provide new estimates of the energies and structures of singlet and triplet states of CH2:, CHF:, and CF2: carbenes, as well as those of their respective triphenylphosphonium ylides. (C) 2013 Elsevier B.V. All rights reserved.
Krasnov; Platonov, Russian Journal of Organic Chemistry, 2000, vol. 36, # 10, p. 1488 - 1499