1.1: triethylamine / methanol / 0 - 20 °C 2.1: potassium carbonate / acetone / 0 - 20 °C / Inert atmosphere 3.1: trichlorophosphate / 0.33 h / 20 °C 3.2: 6 h / 60 °C 4.1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 2.5 h / 50 °C 5.1: triethylamine / methanol / 0 - 20 °C 6.1: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 7.1: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 8.1: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 9.1: trifluoroacetic acid / methanol / 24 h / 50 °C View Scheme

1: KOH / ethanol / Heating 2: K2CO3 / acetone; benzene 3: AlCl3 / CS2 / Heating 4: K2CO3 / acetone; dimethylformamide / Heating 5: AcOOH, HClO4, Ac2O 6: KOH / ethanol / Heating View Scheme

1: KOH / ethanol / Heating 2: K2CO3 / acetone; benzene 3: AlCl3 / CS2 / Heating View Scheme

methanol; sodium methylate T=20°C; 4 h;

1: KOH / ethanol / Heating 2: K2CO3 / acetone; benzene 3: POCl3 4: AcOOH, HClO4, Ac2O / acetic acid View Scheme

1: aq. NaOH / methanol 2: 95 percent / acetone / 4 h / Heating View Scheme

1.1: triethylamine / methanol / 0 - 20 °C 2.1: potassium carbonate / acetone / 0 - 20 °C / Inert atmosphere 3.1: trichlorophosphate / 0.33 h / 20 °C 3.2: 6 h / 60 °C 4.1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 2.5 h / 50 °C 5.1: triethylamine / methanol / 0 - 20 °C 6.1: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 7.1: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 8.1: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 9.1: trifluoroacetic acid / methanol / 24 h / 50 °C 10.1: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: KOH / ethanol / Heating 2: K2CO3 / acetone; benzene 3: AlCl3 / CS2 / Heating 4: K2CO3 / acetone; dimethylformamide / Heating View Scheme