Propylene Oxide → 1,3-Di-(beta-hydroxy-n-propyl)-5-isopropylhydantoin

Participants

Reaction Conditions

Reaction Steps

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.

Provenance & Evidence