反应详情

297 g (1.5 mols) of 3-(2-vinyloxyethyl)-5,5-dimethylhydantoin, prepared as described in Example 1, 87 g (1.5 mols) of propylene oxide, 7.5 g of lithium chloride and 750 ml of dimethylformamide are allowed to react for 4 hours and 30 minutes at 90°-112° C. A further 83.5 g (1.44 mols) of propylene oxide are then added dropwise in the course of 3 hours and 30 minutes at 112°-113° C. and the mixture is left to react for a further 15 minutes. It is then concentrated on a rotary evaporator at 80° C. under vacuum from a waterpump and dried to constant weight at 80° C. and 13.3 Pa. 382 g (99.6% of theory) of a brown, clear, viscous crude product are obtained and are purified by distillation. 347.7 g (90.4 g) of a clear, colourless distillate boiling at 149°-152° C./13.3 Pa are obtained.

1. customto react for 4 hours and 30 minutes at 90°-112° C
2. waitthe mixture is left
3. customto react for a further 15 minutes
4. concentrationIt is then concentrated on a rotary evaporator at 80° C. under vacuum from a waterpump
5. customdried to constant weight at 80° C.
6. custom382 g (99.6% of theory) of a brown, clear, viscous crude product are obtained
7. distillationare purified by distillation
8. custom347.7 g (90.4 g) of a clear, colourless distillate boiling at 149°-152° C./13.3 Pa are obtained