Hydrochloric Acid → 4,6-Diaminoresorcinol Dihydrochloride

Participants

Reaction Steps

An essential point for carrying out the process according to the invention is that the 1,3-dibenzyloxy-4,6-dinitrobenzene is reacted in a two-phase mixture in dilute aqueous hydrochloric acid and an organic solvent, which is immiscible or miscible only to a limited extent with dilute aqueous hydrochloric acid, at normal or elevated pressure and normal or elevated temperature by catalytic hydrogenation, preferably catalytic pump hydrogenation, to give 4,6-diamino-resorcinol dihydrochloride. In a preferred embodiment, a solution of the suspension of 1,3-dibenzyloxy-4,6-dinitrobenzene in an organic solvent is pumped under hydrogenation conditions into a hydrogenation autoclave, into which a suspension of the noble metal catalyst in dilute aqueous hydrochloric acid or an aqueous solution of 4,6-diamino-resorcinol dihydrochloride containing hydrochloric acid has been introduced beforehand under H2 pressure.

Provenance & Evidence