[CH:1]([CH:4]1[NH:8][C:7](=[O:9])[NH:6][C:5]1=[O:10])([CH3:3])[CH3:2].[Cl-].[Li+].[CH2:13]1[O:16][CH:14]1[CH3:15]>OS(O)(=O)=O.CN(C)C=O>[OH:16][CH:14]([CH3:13])[CH2:15][N:8]1[CH:4]([CH:1]([CH3:3])[CH3:2])[C:5](=[O:10])[N:6]([CH2:13][CH:14]([OH:16])[CH3:15])[C:7]1=[O:9]A mixture of 995.0 g of 5-isopropylhydantoin (7 mols), 2000 ml of dimethylformamide and 14.8 g of lithium chloride is stirred at 50° C. 1220 g of propene oxide (21 mols) are slowly added dropwise over the course of 6 hours. Thereafter the temperature is gradually raised at 70° C. and after a total of 15 hours the reaction mixture is allowed to cool. It is adjusted to pH = 7 with a few drops of 2 N H2SO4 and the pale yellow solution is filtered. The solution is completely concentrated at 90° C. bath temperature on a rotational evaporator under a waterpump vacuum and is subsequently treated at 90° C./0.1 mm Hg until constant weight is reached. 1654.5 g of a pale yellow highly viscous product (91.7% of theory) are obtained.
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