Bamberger Rearrangement of <i>N</i>-Arylhydroxylamine to <i>p</i>-Aminophenol in a CO₂–H₂O System

Abstract

The Bamberger rearrangement of N-aryllhydroxylamine was first realized in a CO2–H2O system. The yield of p-aminophenol was 80% when N-phenylhydroxylamine was heated at 100 °C for 1 h under 4 MPa CO2. The process fully avoids the need of inorganic strong acid and is environmentally benign.