Process for preparing p-aminophenol and alkyl substituted...

Details Process for preparing p-aminophenol and alkyl substituted... Process for preparing p-aminophenol and alkyl substituted...

C - Chemistry, Metallurgy

07

C

260/601.5

C07C 215/76 (2006.01)

Patent

CA 1208660

PROCESS FOR PREPARING P-AMINOPHENOL AND ALKYL SUBSTITUTED P-AMINOPHENOL Abstract of the Invention A process for the production of unsubstituted and lower alkyl substituted p-aminophenols. A charge mixture is prepared comprising an unsubstituted or lower alkyl sub- stituted nitrobenzene substrate, a platinum catalyst and a sulfur compound. The sulfur compound may be a divalent sulfur compound in which sulfur is bonded to two other moieties or a compound reducible to such sulfur compound under catalytic hydrogenation conditions. Hydrogen is introduced into the mixture while it is agitated at a temperature of 0-40°C, thereby reducing the substrate to an unsubstituted or alkyl substituted phenylhydroxylamine. The hydroxylamine is there- after heated to a temperature of at least 70°C and agitated at at least 70°C in the presence of a highly dissociated acid, thereby effecting rearrangement of the hydroxylamine to the corresponding p-aminophenol.

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