sodium hydrogensulfite in ethanol

nitrogen(IV) oxide in dichloromethane T=-50°C; Irradiation;

1: 92 percent / Fremy's salt, KH2PO4 / H2O; acetone 2: 86 percent / sidium hydrosulfite / aq. ethanol View Scheme

trifluoroacetic acid in dichloromethane T=25°C; 1 h; Irradiationreaction temperature varied: -50 to 25 deg C; time: 0.25 to 6 h; solvent also acetonitrile; trifluoroacetic acid concn. 0-1.0 mol dm-3; nitration also by NO2 or HNO3; Product distributionMechanism;