1: 90 percent / Lawesson's reagent / toluene / 2 h / 80 °C 2: 80 percent / NaOH, K3<Fe(CN)6> / H2O / 24 h / Ambient temperature 3: 90 percent / ceric ammonium nitrate / acetonitrile; H2O / 1 h / Ambient temperature View Scheme

1: 90 percent / pyridine / toluene / 1 h / 60 - 70 °C 2: 90 percent / Lawesson's reagent / toluene / 2 h / 80 °C 3: 80 percent / NaOH, K3<Fe(CN)6> / H2O / 24 h / Ambient temperature 4: 90 percent / ceric ammonium nitrate / acetonitrile; H2O / 1 h / Ambient temperature View Scheme

1: 90 percent / pyridine / toluene / 1 h / 60 - 70 °C 2: 90 percent / Lawesson's reagent / toluene / 2 h / 80 °C 3: 80 percent / NaOH, K3<Fe(CN)6> / H2O / 24 h / Ambient temperature 4: 90 percent / ceric ammonium nitrate / acetonitrile; H2O / 1 h / Ambient temperature View Scheme