| 摘要 |
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 DEG 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.
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