反应详情

To a boiling suspension of 140 ml. of methyl ethyl ketone containing 18.7 g. (0.133 mole) of methenamine is slowly added a hot solution of 20.3 g (0.133 mole) of d-mandelic acid in 50 ml. of methyl ethyl ketone with vigorously stirring. The heat source is removed. The reaction mixture is stirred to room temperature, and then cooled in an ice-water bath. White crystals are collected by filtration, washed with a small amount of methyl ethyl ketone, followed by anhydrous ether, and dried at 50° C. in vacuum for 3 hours to obtain methenamine dextro-mandelate. mp. 133-4° C [c]D21 + 62.0° (C = 3,H2O)

1. additionTo a boiling suspension of 140 ml
2. customThe heat source is removed
3. temperaturecooled in an ice-water bath
4. filtrationWhite crystals are collected by filtration
5. washwashed with a small amount of methyl ethyl ketone
6. customdried at 50° C. in vacuum for 3 hours