Patent ID: 8536387

Claim:
A process for preparing perfluoro-1,3-butadiene, comprising the following steps: A) the preparation of fluoro-halo-butanes of formula: CF 2 Y I —CFY II —CFY II —CF 2 Y I (V) in which each Y I and each Y II , which are identical or different, are H, Cl or Br, with the condition that vicinal instances of Y I and of Y II are not simultaneously hydrogen; starting with a chloroolefin having the formula: CY″Y =CY′Cl (II) in which Y, Y′, Y″, which are identical or different, are H, Cl or Br, with the condition that Y, Y′, Y″ are not simultaneously hydrogen; and performing the following two steps: a fluorodimerization, and a fluorination with elemental fluorine, wherein the fluorodimerization step is performed prior to the fluorination step, a dehalogenation or dehydrohalogenation step being performed between the two steps, and B) dehalogenation or dehydrohalogenation of the fluoro-halo compounds of formula (V) to give the compound perfluoro-1,3-butadiene.