Process for preparing bromine- and fluorine-containing...

Details Process for preparing bromine- and fluorine-containing... Process for preparing bromine- and fluorine-containing...

C - Chemistry, Metallurgy

07

C

204/91.27

C07C 17/10 (2006.01)

Patent

CA 1062655

ABSTRACT OF THE DISCLOSURE A process for brominating fluorine-containing halogenated hydrocarbons is disclosed which comprises the step of reacting at least one halogenated fluorohydrocarbon compound of formula (I) Image (I) wherein R1 represents hydrogen, fluorine, chlorine, bromine or a lower alkyl group which is perhalogenated by a halogen selected from the group consisting of fluorine, chlorine and bromine; R2 represents hydrogen, fluorine, chlorine, or bromine, and: R3 represents fluorine or perfluorinated lower alkyl, in gaseous form with bromine under irradiation with light having a wavelength from about 250 nm to about 600 nm in the presence of an active amount of chlorine not exceeding about 2 moles per mole of bromine at a reaction temperature not exceeding 300°C, which is sufficient for transforming the reactants into sufficiently stable gaseous compounds and for substituting the hydrogen in a compound of formula (I) by bromine to form a compound of formula (II) Image (II) wherein R1, R2 and R3 are as defined above.

281444

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