in N,N-dimethyl-formamide T=140°C; 48 h;

in ethanol 4 h; Heating;

1: 76 percent / benzene / standing overnight 2: 95 percent / H2S (gas) / ethanol / 1.) -60 - 50 deg C, 13 hrs., 2.) -15 deg C, overnight 3: 68.3 percent / hydrazine hydrate (50 percent), aq.potassium hydroxide (1 N) / -6 - 0 °C 4: 86.8 percent / ethanol / 4 h / Heating View Scheme

1: 89.1 percent / sulfur / 1 h / Heating 2: 76 percent / benzene / standing overnight 3: 95 percent / H2S (gas) / ethanol / 1.) -60 - 50 deg C, 13 hrs., 2.) -15 deg C, overnight 4: 68.3 percent / hydrazine hydrate (50 percent), aq.potassium hydroxide (1 N) / -6 - 0 °C 5: 86.8 percent / ethanol / 4 h / Heating View Scheme

1: 68.3 percent / hydrazine hydrate (50 percent), aq.potassium hydroxide (1 N) / -6 - 0 °C 2: 86.8 percent / ethanol / 4 h / Heating View Scheme

sodium hydrogencarbonate in water pH 8;