Bromine, atomic weight fluorine compounds

Halogen atoms in certain inorganic compounds may be replaced by fluorine by the use of antimony (III) fluoride without a catalyst. In other cases, varying amounts of different kinds of catalysts are required. For example, sometimes the addition of chlorine in the amount of 1 % of the antimony (III) fluoride will suffice. Molecules which are more difficult to fluorinate may require chlorine, bromine, or antimony(V) chloride in quantities amounting to as much as 5% of the weight of antimony (III) fluoride used. 

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