申请人:Akzona Incorporated
公开号:US04129740A1
公开(公告)日:1978-12-12
An improved process for the preparation of para-nitroso-diphenylhydroxylamines is disclosed. One member of the group consisting of nitrosobenzene, ortho-substituted nitrosobenzenes, meta-substituted nitrosobenzenes, ortho-meta-disubstituted nitrosobenzenes and para-substituted nitrosobenzenes is reacted with one member selected from the group consisting of nitrosobenzene, ortho-substituted nitrosobenzenes, meta-substituted nitrosobenzenes, and ortho-meta-disubstituted nitrosobenzenes, in the presence of an acid catalyst. The improvement comprises utilizing as the acid catalyst an acid selected from the group consisting of aliphatic, cycloaliphatic, and aromatic sulfonic acids, having a pK.sub.a equal to or less than one, perchloric acid, and trifluoroacetic acid, in an amount equal to or greater than 0.5 mol of acid per mol of nitroso reactants, and performing the reaction at a temperature from about -20.degree. C to about 60.degree. C.
揭示了一种改进的制备对硝基二苯羟胺的方法。将由亚硝基苯、邻位取代的亚硝基苯、间位取代的亚硝基苯、邻-间二取代的亚硝基苯和对位取代的亚硝基苯中的一种与由亚硝基苯、邻位取代的亚硝基苯、间位取代的亚硝基苯和邻-间二取代的亚硝基苯中选择的一种反应,在酸催化剂的存在下。改进包括利用作为酸催化剂的酸,所述酸选自脂肪族、环脂族和芳香族磺酸的组中,其pK.sub.a等于或小于1,高氯酸和三氟乙酸,其量等于或大于每摩尔亚硝反应物0.5摩尔的酸,并在温度从约-20摄氏度到约60摄氏度进行反应。