A new process for the preparation of 1-fluorocyclopropyl methyl ketone of the formula ##STR1## which process comprises a) in a first step, reacting 2-acetyl-2-chloro-4-butanolide of the formula ##STR2## with an addition product of triethylamine and hydrogen fluoride of the formula (C.sub.2 H.sub.5).sub.3 N.multidot.n HF in which n represents the numbers 1, 2 or 3, in the presence of a diluent at a temperature between 20.degree. C. and 120.degree. C. and b) in a second step, reacting the resulting 2-acetyl-2-fluoro-4-butanolide of the formula ##STR3## with a nucleophilic agent in the presence of a diluent at a temperature between 50.degree. C. and 200.degree. C. New halogenoketones of the formula ##STR4## in which Hal represents chlorine or bromine.
一种制备
1-氟环丙基甲基酮的新工艺,该工艺包括:a)在第一步中,在20℃至120℃的温度下,在稀释剂的存在下,将式为(
C2H5)3N·nHF(其中n表示数字1、2或3)的
三乙胺和
氢氟酸加成物与式为##STR2##的2-乙酰基-2-
氯-4-丁酯内酯反应;b)在第二步中,在50℃至200℃的温度下,在稀释剂的存在下,将所得的式为##STR3##的2-乙酰基-2-
氟-4-丁酯与亲核试剂反应。其中新的卤代酮的公式为##STR4##,其中Hal表示
氯或
溴。