Process for preparing aromatic aminohydroxy compounds

Die Erfindung betrifft ein Verfahren zur Herstellung von Aminohydroxyverbindungen durch Umsetzung aromatischer Nitrosoverbindungen mit Hydrazin, bei dem man die aromatische Nitrosoverbindung und das Hydrazin in wäßrigem Medium bei Temperaturen von 10 bis 50°C in etwa äquivalenten Mengen umsetzt, wobei man die aromatische Nitrosoverbindung vorlegt und das Hydrazin zugibt. An improvement in the process for the preparation of an aromatic hydroxy compounds by reacting an aromatic nitroso compound of the formula (I) wherein R1, R2 and R3 independently represent hydrogen, a lower alkyl radical, halogen, a carboxyl or sulfo group or the corresponding alkali metal salt thereof or R1, R2 or R3 individually represent an optionally substituted aromatic ring formed by linking two adjacent radicals, with hydrazine, the improvement residing in reacting the aromatic nitroso compound with the hydrazine in approximately equivalent amounts in an aqueous medium at temperatures from 10 DEG to 50 DEG C., in the absence of a catalyst the aromatic nitroso compound being initially introduced into a reaction chamber and the hydrazine being added thereto.