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Lewis acid catalyst. Catalyst for electrophilic halogenation of alkanes: J. Am. Chem. Soc., 95, 7680, 7686 (1973). See also Antimony(V) fluoride, 33484.• Promotes rearrangement of 3-bromoflavanones to isoflavones: J. Chem. Soc., Chem. Commun., 151 (1976); and remote hydroxylation of ɑ-bromo keto steroids: J. Org. Chem., 47, 4268 (1982).