1: potassium carbonate / acetone / 9.5 h / 20 °C / Inert atmosphere 2: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 3: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 4: trifluoroacetic acid / methanol / 24 h / 50 °C View Scheme

1: 95 percent / NaOH, TEBA / tetrahydrofuran / 4 h 2: 73 percent / silver(II) dipicolinate / benzene; H2O / 0.83 h / Ambient temperature View Scheme

1: potassium carbonate / acetone / 9.5 h / 20 °C / Inert atmosphere 2: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 3: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 4: trifluoroacetic acid / methanol / 24 h / 50 °C 5: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme