potassium hydrogencarbonate; thiourea in ethanol

in ethanol 1.5 h; Heating;

1: 80 percent / acetic acid, CrO3 / H2O / Ambient temperature 2: 83 percent / acetic acid, bromine / CHCl3 / 48 - 50 °C 3: 87 percent / ethanol / 1.5 h / Heating View Scheme

1: 83 percent / acetic acid, bromine / CHCl3 / 48 - 50 °C 2: 87 percent / ethanol / 1.5 h / Heating View Scheme