Preparation of n-aryl- and n-hetarylhydroxylamines

摘要

PCT No. PCT/EP96/00170 Sec. 371 Date Jul. 7, 1997 Sec. 102(e) Date Jul. 7, 1997 PCT Filed Jan. 17, 1996 PCT Pub. No. WO96/22967 PCT Pub. Date Aug. 1, 1996A process for preparing aromatic or heteroaromatic hydroxylamines of the general formula I <IMAGE> (I) where R1 is an unsubstituted or substituted aryl radical or an unsubstituted or substituted hetaryl radical from the pyridine or quinoline groups, by hydrogenation of nitro compounds of the general formula IIR1-NO2(II)where R1 has the meaning indicated above, in the presence of a platinum catalyst on an activated carbon support or in the presence of a palladium catalyst doped with sulfur or selenium on an activated carbon support, by carrying out the reaction in the presence of a nitrogen-substituted morpholine compound of the general formula III <IMAGE> (III) R2 being alkyl radicals having 1 to 5 carbon atoms and R3 to R10 being hydrogen atoms or alkyl radicals having 1 to 5 carbon atoms is described.