Halogenated α-fluoroethers (or bis-derivatives thereof) can be produced by reacting a halogenated hemiacetal (or bis-derivative thereof) with sulfuryl fluoride (SO2F2) in the presence of an organic base. The reaction is conducted preferably in the presence of "a salt or complex of an organic base with hydrogen fluoride", whereby the objective dehydroxyfluorination can proceed extremely favorably. It is still preferable to use as the starting substrate a halogenated hemiacetal prepared from fluoral or 3,3,3-trifluoropyruvic acid ester. Thus, industrially important halogenated α-fluoroethers can be industrially produced with high selectivity and in high yield.
卤代 α-
氟乙烷(或其双衍
生物)可通过卤代
半缩醛(或其双衍
生物)与
氟化
硫(SO2F2)在有机碱存在下发生反应而制得。该反应最好在 "有机碱与
氟化氢的盐或络合物 "存在下进行,这样可以非常有利地进行客观的脱羟基
氟化反应。使用由
氟醛或 3,3,3-三
氟丙酮酸酯制备的卤代
半缩醛作为起始底物仍然更为可取。因此,工业上重要的卤代 α-
氟醚可以高选择性和高产率地生产出来。