Palladium-Catalyzed Regioselective Halogenation of Aromatic Azo Compounds
作者:Xian-Tao Ma、Shi-Kai Tian
DOI:10.1002/adsc.201200902
日期:2013.1.25
A highly regioselective halogenation reaction of symmetrical and unsymmetrical aromatic azo compounds has been developed at roomtemperature or at 50 °C. In the presence of 5 mol% palladium diacetate and 0.5 equiv. of p-toluenesulfonic acid, a range of symmetrical aromatic azo compounds smoothly undergo monobromination with N-bromosuccinimide to give the corresponding unsymmetrical aromatic azo compounds