[CH2:1]1[O:4][CH:2]1[CH3:3].[CH2:5]([C:7]1([CH2:16][CH3:17])[C:12](=[O:13])[NH:11][C:10](=[O:14])[NH:9][C:8]1=[O:15])[CH3:6]>C([N+](CC)(CC)CC)C.CN(C)C=O>[OH:4][CH:2]([CH3:3])[CH2:1][N:11]1[C:12](=[O:13])[C:7]([CH2:5][CH3:6])([CH2:16][CH3:17])[C:8](=[O:15])[N:9]([CH2:1][CH:2]([OH:4])[CH3:3])[C:10]1=[O:14]40.7 g (0.7 mol) of propene oxide are added dropwise over the course of 1 hour to a mixture of 55.3 g of 5,5-diethylbarbituric acid (0.3 mol), 2.77 g of tetraethylammonium chloridde (5 mol percent) and 400 ml of dimethylformamide at 35° C. whilst stirring. Thereafter the mixture is gradually heated to 100° C. After 7 hours' stirring at 100° C. the mixture is worked-up in accordance with example 4. 92.5 g of crude 1,3-di(β-hydroxy-n-propyl)-5,5-diethylbarbituric acid (99.5% of theory) are obtained. The product boils at 138°-148° C. under 0.08 mm Hg; 75.2 g or pure product (80% of theory) are obtained.
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