PPA T=200°C;

sodium hydroxide in dichloromethane 0.25 h;

4-(N,N-dimethlyamino)pyridine; 1,2-dichloro-ethane in dichloromethane T=20°C; 12 h; Inert atmosphere;

1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / acetonitrile / 0.42 h / 80 °C / |Inert atmosphere 2: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione; tetrabutylammomium bromide / acetonitrile / 20 °C / |Inert atmosphere 3: aluminum oxide / 20 °C / |Inert atmosphere View Scheme

1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione; tetrabutylammomium bromide / acetonitrile / 20 °C / |Inert atmosphere 2: aluminum oxide / 20 °C / |Inert atmosphere View Scheme