超声波促进常压CO2-H2O体系中芳香 硝基物选择还原反应

he promotion effect of ultrasound on the selective reduction of nitroarenes to N-arylhydroxylamines using Zn in normal CO2-H2O system is demonstrated. Under ultrasound (40 kHz), the yield of N-phenylhydroxylamine reaches 95% when the reaction is carried out at 25 C for 60 min with a Zn to nitrobenzene molar ratio equal to 2.2. The application of ultrasound to the reaction system has the advantages of shorter reaction time, less amount of Zn consumption and higher yield of N-arylhydroxylamines.