1-propan-2-yl-1,3-diazinane-2,4,6-trione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 350 ml of phosphorus oxychloride containing 15 ml of water are slowly run into 75 g (0.44 mole) of 1-isopropyl barbituric acid. After the violent exothermic reaction has abated, the reaction mixture is refluxed for 1 hour. The excess POCl3 is removed by evaporation in vacuo and the oily residue is poured onto ice, giving a precipitate which is filtered, washed with ice water and dried. 55 g of yellowish crystals are thus obtained. After the violent exothermic reaction the reaction mixture is refluxed for 1 hour The excess POCl3 is removed by evaporation in vacuo the oily residue is poured onto ice giving a precipitate which is filtered washed with ice water dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 350 ml of phosphorus oxychloride containing 15 ml of water are slowly run into 75 g (0.44 mole) of 1-isopropyl barbituric acid. After the violent exothermic reaction has abated, the reaction mixture is refluxed for 1 hour. The excess POCl3 is removed by evaporation in vacuo and the oily residue is poured onto ice, giving a precipitate which is filtered, washed with ice water and dried. 55 g of yellowish crystals are thus obtained. After the violent exothermic reaction the reaction mixture is refluxed for 1 hour The excess POCl3 is removed by evaporation in vacuo the oily residue is poured onto ice giving a precipitate which is filtered washed with ice water dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 13.8 g (0.6 mole) of sodium are dissolved in 250 ml of anhydrous ethanol. 61.2 g (0.46 mole) of diethyl malonate and 47.3 g of isopropyl urea (0.46 mole) are added to the resulting solution. The mixture thus formed is heated for 7.5 hours to 120° C. (temperature of the bath). After cooling, a solution of concentrated HCl and water (1:4) is slowly added until the precipitate formed during the reaction has dissolved. The resulting solution is evaporated until a precipitate appears and is then left standing at 0° C. The precipitate is then filtered, washed with cold water and dried, giving 75 g of colourless crystals. The mixture thus formed is heated for 7.5 hours to 120° C. (temperature of the bath) After cooling formed during the reaction has dissolved The resulting solution is evaporated until a precipitate is then left standing at 0° C The precipitate is then filtered washed with cold water dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 13.8 g (0.6 mole) of sodium are dissolved in 250 ml of anhydrous ethanol. 61.2 g (0.46 mole) of diethyl malonate and 47.3 g of isopropyl urea (0.46 mole) are added to the resulting solution. The mixture thus formed is heated for 7.5 hours to 120° C. (temperature of the bath). After cooling, a solution of concentrated HCl and water (1:4) is slowly added until the precipitate formed during the reaction has dissolved. The resulting solution is evaporated until a precipitate appears and is then left standing at 0° C. The precipitate is then filtered, washed with cold water and dried, giving 75 g of colourless crystals. The mixture thus formed is heated for 7.5 hours to 120° C. (temperature of the bath) After cooling formed during the reaction has dissolved The resulting solution is evaporated until a precipitate is then left standing at 0° C The precipitate is then filtered washed with cold water dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 350 ml of phosphorus oxychloride containing 15 ml of water are slowly run into 75 g (0.44 mole) of 1-isopropyl barbituric acid. After the violent exothermic reaction has abated, the reaction mixture is refluxed for 1 hour. The excess POCl3 is removed by evaporation in vacuo and the oily residue is poured onto ice, giving a precipitate which is filtered, washed with ice water and dried. 55 g of yellowish crystals are thus obtained. After the violent exothermic reaction the reaction mixture is refluxed for 1 hour The excess POCl3 is removed by evaporation in vacuo the oily residue is poured onto ice giving a precipitate which is filtered washed with ice water dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 13.8 g (0.6 mole) of sodium are dissolved in 250 ml of anhydrous ethanol. 61.2 g (0.46 mole) of diethyl malonate and 47.3 g of isopropyl urea (0.46 mole) are added to the resulting solution. The mixture thus formed is heated for 7.5 hours to 120° C. (temperature of the bath). After cooling, a solution of concentrated HCl and water (1:4) is slowly added until the precipitate formed during the reaction has dissolved. The resulting solution is evaporated until a precipitate appears and is then left standing at 0° C. The precipitate is then filtered, washed with cold water and dried, giving 75 g of colourless crystals. The mixture thus formed is heated for 7.5 hours to 120° C. (temperature of the bath) After cooling formed during the reaction has dissolved The resulting solution is evaporated until a precipitate is then left standing at 0° C The precipitate is then filtered washed with cold water dried