Abstract
Carbon-bromine bond cleavage is observed when 4-dimethylaminopyridine is treated with CF2Br2 and BrCF2CF2Br to yield N-(bromodifluoromethyl) and N-(2-bromo-1,1,2,2-tetrafluoromethyl)pyridinium bromides, 1-Br and 2-Br, which are reductively debrominated using Bu3SnH and fluorinated by anhydrous Me4N+F–; the molecular structure of 1-Br is determined by single crystal X-ray crystallography to reveal a partial quinoidal character in the pyridine system and a hypervalent Br–⋯BrCF2 pairing.
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