triethylamine in acetonitrile 20 h; Heating;

1: 56 percent / CuBr, 47percent HBr, NaNO2 / H2O / 1.) 10 deg C, 2.) room temp., 30 min, 3.) 80 deg C, 20 min 2: 59 percent / 35percent H2O2 / acetic acid / 20 h / 110 °C 3: 64 percent / Et3N / acetonitrile / 20 h / Heating View Scheme

1: 59 percent / 35percent H2O2 / acetic acid / 20 h / 110 °C 2: 64 percent / Et3N / acetonitrile / 20 h / Heating View Scheme