1: With sodium chlorite; sodium salt of phosphorous acid in tetrahydrofuran; water T=5 - 10°C; 2 h; 2: With sodium thiosulfate in tetrahydrofuran; water T=20°C;

1: sodium hydroxide / water / |Reflux 2: water / 2 h / 205 °C / |Autoclave View Scheme

1.1: methanesulfonic acid / acetic acid / 0.25 h / 50 - 60 °C 1.2: 17 h / 90 °C 2.1: selenium(IV) oxide / 1,4-dioxane; water / 0.5 h / 77 °C / |Reflux 3.1: sodium chlorite; sodium salt of phosphorous acid / tetrahydrofuran; water / 2 h / 5 - 10 °C 3.2: 20 °C View Scheme