Abstract:

In this work the Bamberger rearrangement reaction for p-aminophenol（PAP）prepared by electrochemical reduction of nitrobenzene was investigated.Cyclic voltammetry was used to investigate the catalytic effect of several catalysts，and the peak current of the reduction of nitrobenzene obviously increased when kieselguhr，sulphated zirconia and beta zeolite were added，respectively.The rearrangement of phenylhydroxylamine（PHA）was studied in the presence of catalysts.It has been found that the best experimental conditions in acid solution were：the concentration of H⁺was 0.5 mol·Bamberger重排反应。首先用循环伏安法考察了几种催化剂的催化活性，发现硅藻土、硫酸氧化锆、β沸石加入后硝基苯的还原峰电流有显著增大。还考察了羟基苯胺在不同条件下的转位效果。实验发现，酸性条件下，最佳反应条件为H⁺浓度为0.5～1 mol·L^-1、反应时间为15 min，最佳无机酸为磷酸。温度为70℃时，硅藻土和硫酸氧化锆有较为显著的催化效果。