1: triethylamine / dichloromethane / 16 h / 25 °C / Inert atmosphere 2: titanium tetrachloride / dichloromethane / 18 h / -25 - -20 °C / Inert atmosphere 3: benzene-selenenyl bromide; sodium hydrogencarbonate / methanol; dichloromethane / 3 h / 25 °C / Inert atmosphere 4: tetrabutyl ammonium fluoride / tetrahydrofuran / 16 h / 25 °C / Inert atmosphere View Scheme

jones' reagent in acetone T=0°C; 0.5 h;