FIELD: industrial organic synthesis.
SUBSTANCE: invention relates to production of unsaturated perfluorohydrocarbons, in particular hexafluorobuta-1,3-diene, which is prepared by dehalogenation of polyhalobutanes of formula CF2X1-CFX2-CFX2-CF2X1, wherein X1 and X2 are I, Br, or Cl, using zinc dispersed in polar organic solvent. Polyhalobutane is delivered stepwise at a rate allowing maintenance of process temperature by 8 to 50°C below boiling temperature of solvent.
EFFECT: increased total yield and purity of hexafluorobuta-1,3-diene.
3 cl, 1 tbl, 6 ex
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