Process for preparing 4,6-diamino-resorcinol dihydrochloride

摘要

PCT No. PCT/EP97/02409 Sec. 371 Date Nov. 17, 1998 Sec. 102(e) Date Nov. 17, 1998 PCT Filed May 12, 1997 PCT Pub. No. WO97/44311 PCT Pub. Date Nov. 27, 1997The invention concerns 4,6-diamino-resorcinol which is prepared in the form of its dihydrochloride by catalytic hydrogenation of 1,3-benzyloxy-4,6-dinitrobenzene on a noble metal contact in a two-phase mixture of dilute aqueous hydrochloric acid and an organic solvent which is not miscible with dilute aqueous hydrochloric acid. This process is carried out at a pressure of between 1 and 200 bar and a temperature of between 0 and 200 DEG C.