Process for preparing 1,1-dihalo-1,2,2,2- tetrafluoroethanes

Details Process for preparing 1,1-dihalo-1,2,2,2- tetrafluoroethanes Process for preparing 1,1-dihalo-1,2,2,2- tetrafluoroethanes

C - Chemistry, Metallurgy

07

C

260/658.1

C07C 19/08 (2006.01) C07C 17/358 (2006.01)

Patent

CA 1226586

ABSTRACT OF THE DISCLOSURE: A process for preparing l,l-dihalo-1,2,2,2- tetrafluoroethanes by isomerization of l,2-dihalotetra- fluoroethanes at their reflux temperature, by using, as a catalyst, the reaction product prepared ?in situ? from an anhydrous aluminium halide with at least equimolecular amounts of the isomer l,1-dihalo-1,2,2,2-tetrafluoroethane in a medium consisting of 1,2-dihalotetrafluoroethane. The products find application as intermediates for pyre- throid insecticides.

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