Bamberger_rearrangement
The Bamberger rearrangement is the chemical reaction of phenylhydroxylamines with strong aqueous acid, which will rearrange to give 4-aminophenols.[1] It is named for the German chemist Eugen Bamberger (1857–1932).[2][3]
The starting phenylhydroxylamines are typically synthesized by the transfer hydrogenation of nitrobenzenes using rhodium[4] or zinc[5] catalysts.
One application is in the synthesis of fenhexamid .