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the replacement in organic compounds of, most often, chlorine by fluorine through the action of antimony trifluoride (SbF3). The reaction is usually carried out in the presence of Sb salts in which antimony displays an oxidation state of+5. Examplesof the products obtained through this process are seen in the following reactions:CCl4 → CF2 Cl2 + CFCl3CHCl3 → CHFCl2 + CHF2ClCCl3CCl3 → CFCl2 - CFCl2 + CFCl2 - CF2 Cl
C6H5 CCl3 → C6H5CF3 
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