M. Tordeux et C. Wakselman, THE BAMBERGER REACTION IN HYDROGEN-FLUORIDE - THE USE OF MILD REDUCTIVE METALS FOR THE PREPARATION OF FLUOROAROMATIC AMINES, Journal of fluorine chemistry, 74(2), 1995, pp. 251-254
The reduction of nitroaromatic compounds by various metals (tin, lead,
bismuth) in liquid hydrogen fluoride under an inert atmosphere leads
to fluoroaromatic amines, in accord with the Bamberger reaction. Gener
ally, a co-solvent such as pentane or methylene chloride is used. Some
non-fluorinated arylamines are also formed by a competitive direct re
duction of the N-arylhydroxylamine intermediate. Of the mild reductive
metals studied, bismuth was the most selective.