formic acid; sodium nitrite in water T=0°C; 0.25 h;

1: 79 percent / HBr, acetic acid / 72 h 2: 61 percent / 1N aq. NaOH / 0.75 h / Ambient temperature 3: 90 percent / sodium nitrite, formic acid / H2O / 0.25 h / 0 °C View Scheme

1: 61 percent / 1N aq. NaOH / 0.75 h / Ambient temperature 2: 90 percent / sodium nitrite, formic acid / H2O / 0.25 h / 0 °C View Scheme