pyridine; tetraphosphorus decasulfide 1 h; Heating;

1: NH4OH / methanol; diethyl ether / 46 h / 20 °C 2: Lawesson's reagent / toluene / 1.5 h / Heating View Scheme

1: ZnCl2 / 3 h / 200 - 230 °C 2: diethyl ether / 2 h / 10 °C 3: NH4OH / methanol; diethyl ether / 46 h / 20 °C 4: Lawesson's reagent / toluene / 1.5 h / Heating View Scheme

1: ZnCl2 / 3 h / 200 - 230 °C 2: diethyl ether / 2 h / 10 °C 3: NH4OH / methanol; diethyl ether / 46 h / 20 °C 4: Lawesson's reagent / toluene / 1.5 h / Heating View Scheme

1: diethyl ether / 2 h / 10 °C 2: NH4OH / methanol; diethyl ether / 46 h / 20 °C 3: Lawesson's reagent / toluene / 1.5 h / Heating View Scheme

1: hexamine; ammonium chloride / ethanol / 4 h / Heating 2: 66.28 percent / pyridine; P2S5 / 1 h / Heating View Scheme

1.1: acetonitrile; H2O / 3 h / 20 °C 2.1: 0.61 g / sodium nitrite; AcOH / 3 h / 20 °C 3.1: BuLi / tetrahydrofuran; hexane / 0.25 h / -78 °C 3.2: 82 percent / tetrahydrofuran; hexane / -78 - 20 °C 4.1: BuLi / tetrahydrofuran; hexane / 0.25 h / -78 °C 4.2: 92 percent / tetrahydrofuran; hexane / -78 - 20 °C 5.1: 74 percent / Na/Hg; K2HPO4 / acetonitrile; ethanol View Scheme

1: acetonitrile; H2O / 3 h / 20 °C 2: 0.61 g / sodium nitrite; AcOH / 3 h / 20 °C View Scheme