tetraphosphorus decasulfide in toluene T=110°C; 0.5 h;

Lawesson's reagent in toluene T=110°C; 12 h; Inert atmosphere;

1: pyridine / dichloromethane / 1 h / 0 - 20 °C 2: tetraphosphorus decasulfide / toluene / 0.5 h / 110 °C View Scheme

1: sulfuric acid; nitric acid / 1 h / 55 - 59 °C 2: hydrogen bromide; bromine; sodium nitrite / water / 0.75 h / -5 - 0 °C 3: iron; acetic acid / 60 °C 4: pyridine / dichloromethane / 1 h / 0 - 20 °C 5: tetraphosphorus decasulfide / toluene / 0.5 h / 110 °C View Scheme

1: iron; acetic acid / 60 °C 2: pyridine / dichloromethane / 1 h / 0 - 20 °C 3: tetraphosphorus decasulfide / toluene / 0.5 h / 110 °C View Scheme

1: hydrogen bromide; bromine; sodium nitrite / water / 0.75 h / -5 - 0 °C 2: iron; acetic acid / 60 °C 3: pyridine / dichloromethane / 1 h / 0 - 20 °C 4: tetraphosphorus decasulfide / toluene / 0.5 h / 110 °C View Scheme