1: 69 percent / NaNO2, HCl / H2O; CH2Cl2 / 0.67 h / 0 °C 2: acetic acid, pH 4.6 / H2O / ΔH(act.), ΔS(act), various temperature, various pH View Scheme

hydrogenchloride; sodium nitrite in dichloromethane; water T=0°C; 0.666667 h;