1: trichloromonobromomethane; 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 1.17 h / 0 °C 2: hydrogenchloride / water; acetone / 1 h / Reflux View Scheme

1: trichloromonobromomethane; 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 1.17 h / 0 °C 2: hydrogenchloride / water; acetone / 1 h / Reflux 3: tetrahydrofuran; toluene / 12 h / 0 °C 4: Dess-Martin periodane / dichloromethane / 2 h / 20 °C / Inert atmosphere View Scheme

trichloromonobromomethane; 1,8-diazabicyclo[5.4.0]undec-7-ene in dichloromethane T=0°C; 1.16667 h;