1: dry P2O5, orthophosphoric acid / tetrahydrofuran / 0.17 h / 25 °C 2: 1 M LiOH / 22 h / pH=11 3: 1.) barium acetate / 1.) ethanol, 2 h, 0 deg C; 2.) water, vacuo, 6 h, 50 deg C View Scheme

1: 1 M LiOH / 22 h / pH=11 2: 1.) barium acetate / 1.) ethanol, 2 h, 0 deg C; 2.) water, vacuo, 6 h, 50 deg C View Scheme

barium Acetate 1.) ethanol, 2 h, 0 deg C; 2.) water, vacuo, 6 h, 50 deg C; Yield given. Multistep reaction;