反应详情

To 56.4 g (0.323 mole) of benzamidine hydrochloride hydrate in 200 ml of warm water is added with vigorous stirring 40 ml of biacetyl. Within a few minutes a heavy precipitate forms and 150 ml of isopropyl alcohol is added followed by 5.0 g of sodium acetate hydrate dissolved in 15 ml of warm water. Stirring is continued for 4 hours after which time the product, 4,5-dimethyl-2-phenylimidazoline-4,5-diol hydrochloride, is filtered off and washed with isopropyl alcohol. Recrystallization from 95% ethanol gives the pure product, m.p. 162°-165° C (dec.).

1. filtrationafter which time the product, 4,5-dimethyl-2-phenylimidazoline-4,5-diol hydrochloride, is filtered off
2. washwashed with isopropyl alcohol
3. customRecrystallization from 95% ethanol
4. customgives the pure product, m.p. 162°-165° C (dec.)