5,5-dimethyl-1,3,2$l^{6}-dioxathiane-2,2-dione

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 10.0 g (0.064 mol) of 5,5-dimethyl-1,3,2-dioxathiane-2-oxide was introduced at 20° C. in 100 ml of methylene chloride and 50 ml of water in a 250 ml three-necked flask. 0.02 g of 90 percent ruthenium trichloride was added as a catalyst. 152.45 g (0.0727 mol) of sodium hypochlorite in water was added with stirring for 20 minutes, and the temperature increased to 30° C. The reaction mixture was stirred for five more hours and mixed with 10 drops of isopropanol; the yellow color faded and a black precipitate formed. The water phase was extracted twice with methylene chloride (50 ml), and the combined organic phases were extracted with NaHCO3 solution (100 ml), dried with Na2SO4 and concentrated by evaporation. The white crystalline product was dried overnight at room temperature at a pressure of 15 mbars and weighed 10.65 g, which corresponded to a yield of 99 percent, relative to the 5,5-dimethyl-1,3,2-dioxathiane-2-oxide used. The reaction mixture was stirred for five more hours a black precipitate formed The water phase was extracted twice with methylene chloride (50 ml) the combined organic phases were extracted with NaHCO3 solution (100 ml) dried with Na2SO4 concentrated by evaporation The white crystalline product was dried overnight at room temperature at a pressure of 15 mbars

反应条件: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 10.0 g (0.064 mol) of 5,5-dimethyl-1,3,2-dioxathiane-2-oxide was introduced at 20° C. in 100 ml of methylene chloride and 50 ml of water in a 250 ml three-necked flask. 0.02 g of 90 percent ruthenium trichloride was added as a catalyst. 152.45 g (0.0727 mol) of sodium hypochlorite in water was added with stirring for 20 minutes, and the temperature increased to 30° C. The reaction mixture was stirred for five more hours and mixed with 10 drops of isopropanol; the yellow color faded and a black precipitate formed. The water phase was extracted twice with methylene chloride (50 ml), and the combined organic phases were extracted with NaHCO3 solution (100 ml), dried with Na2SO4 and concentrated by evaporation. The white crystalline product was dried overnight at room temperature at a pressure of 15 mbars and weighed 10.65 g, which corresponded to a yield of 99 percent, relative to the 5,5-dimethyl-1,3,2-dioxathiane-2-oxide used. The reaction mixture was stirred for five more hours a black precipitate formed The water phase was extracted twice with methylene chloride (50 ml) the combined organic phases were extracted with NaHCO3 solution (100 ml) dried with Na2SO4 concentrated by evaporation The white crystalline product was dried overnight at room temperature at a pressure of 15 mbars

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 10 g (0.067 mol) of 5,5-dimethyl-1,3,2-dioxathiane 2-oxide (prepared in accordance with Example 1), 70 ml of methylene chloride, 0.76 g (0.0033 mol) of benzyltriethylammonium chloride and 70 ml of water are placed in a 350 ml four-necked flask which is provided with a stirrer and a thermometer. 7.5 g (0.0475 mol) of KMnO4 are added portion-wise at 5°-10° C. and while stirring vigorously. After the addition the reaction mixture is stirred at room temperature for a further 30 minutes and suction filtered. The organic phase is separated. The residue is washed well on the suction filter with 20 ml of methylene chloride and the aqueous phase is again extracted with this new filtrate. The combined organic phases are extracted with 1 g of NaHSO3 in 20 ml of water and washed with a small amount of water. After drying over Na2SO4 and evaporation there are obtained 10.2 g of 5,5-dimethyl-1,3,2-dioxathiane 2,2-dioxide as a white powder with a m.p. of 80°-82° C. which is provided with a stirrer After the addition the reaction mixture is stirred at room temperature for a further 30 minutes suction filtered The organic phase is separated The residue is washed well on the suction filter with 20 ml of methylene chloride the aqueous phase is again extracted with this new filtrate The combined organic phases are extracted with 1 g of NaHSO3 in 20 ml of water washed with a small amount of water After drying over Na2SO4 and evaporation there

反应条件: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 10.0 g (0.064 mol) of 5,5-dimethyl-1,3,2-dioxathiane-2-oxide was introduced at 20° C. in 100 ml of methylene chloride and 50 ml of water in a 250 ml three-necked flask. 0.02 g of 90 percent ruthenium trichloride was added as a catalyst. 152.45 g (0.0727 mol) of sodium hypochlorite in water was added with stirring for 20 minutes, and the temperature increased to 30° C. The reaction mixture was stirred for five more hours and mixed with 10 drops of isopropanol; the yellow color faded and a black precipitate formed. The water phase was extracted twice with methylene chloride (50 ml), and the combined organic phases were extracted with NaHCO3 solution (100 ml), dried with Na2SO4 and concentrated by evaporation. The white crystalline product was dried overnight at room temperature at a pressure of 15 mbars and weighed 10.65 g, which corresponded to a yield of 99 percent, relative to the 5,5-dimethyl-1,3,2-dioxathiane-2-oxide used. The reaction mixture was stirred for five more hours a black precipitate formed The water phase was extracted twice with methylene chloride (50 ml) the combined organic phases were extracted with NaHCO3 solution (100 ml) dried with Na2SO4 concentrated by evaporation The white crystalline product was dried overnight at room temperature at a pressure of 15 mbars