1: 85 percent / mercuric cyanide, mercuric bromide, / 1,2-dichloro-ethane / Ambient temperature 2: 100 percent / thiourea / ethanol / 4 h / Heating 3: ammonia / methanol / 120 h View Scheme

1: 85 percent / mercuric cyanide, mercuric bromide, / 1,2-dichloro-ethane / Ambient temperature 2: 100 percent / ammonia / methanol / 120 h 3: 0.25 g / barium nitrite, acetic acid / H2O / 168 h View Scheme