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    • 65. 发明授权
    • Quaternary ammonium fluoride catalyzed halogenation of carbon acids
    • 第四纪氟化铵催化碳酸化的卤化
    • US5132475A
    • 1992-07-21
    • US730186
    • 1991-07-12
    • Yoel Sasson
    • Yoel Sasson
    • C07B39/00C07C17/14C07C67/307
    • C07C67/307C07B39/00C07C17/14
    • A process is disclosed for chlorinating, brominating and/or iodinating an organic substrate containing both a single acidic hydrogen atom and at least one electron withdrawing group attached to the same carbon atom. The process replaces the single acidic hydrogen with chlorine, bromine and/or iodine and involves reacting the substrate in solution with a halogenating agent (e.g., a perhalomethane wherein the halogen substituents are I, Br and/or Cl, a trihaloacetic acid ester wherein the halogen substituents are Br and/or Cl, or a perfluoroalkyl halide wherein the halide is I, Br and/or Cl) in the presence of a quaternary ammonium fluoride catalyst of the formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 NF where R.sup.1, R.sup.2, and R.sup.3 and R.sup.4 are independently chosen from the group consisting of hydrocarbyl radicals containing from 1 to about 20 carbon atoms.
    • 公开了一种用于氯化,溴化和/或碘化含有单个酸性氢原子和连接到相同碳原子的至少一个吸电子基团的有机基材的方法。 该方法用氯,溴和/或碘代替单个酸性氢,并且包括使溶液中的底物与卤化剂(例如,卤素取代基为I,Br和/或Cl的三卤代乙酸酯,其中, 在式R1R2R3R4NF的季铵氟化物催化剂存在下,卤素取代基是Br和/或Cl,或全氟烷基卤化物,其中卤化物是I,Br和/或Cl),其中R 1,R 2和R 3和R 4独立地选自 由含有1至约20个碳原子的烃基组成。