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Bamberger rearrangement : ウィキペディア英語版
Bamberger rearrangement
The Bamberger rearrangement is the chemical reaction of ''N''-phenylhydroxylamines with strong aqueous acid, which will rearrange to give 4-aminophenols. It is named for the German chemist Eugen Bamberger (1857–1932).
N-Phenylhydroxylamines are typically synthesized from nitrobenzenes by reduction using rhodium or zinc.
==Reaction mechanism==

The mechanism of the Bamberger rearrangement proceeds from the monoprotonation of N-phenylhydroxylamine 1. N-protonation 2 is favored, but unproductive. O-protonation 3 can form the nitrenium ion 4, which can react with nucleophiles (H2O) to form the desired 4-aminophenol 5.

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